def from_conf(conf, dpb, apb):
opts = conf.options
regions = dpb.domain.regions
if opts.use_mesh_velocity:
import tables as pt
fd = pt.open_file(opts.mesh_velocity_filename, mode="r")
aux = fd.get_node("/u").read()
nu = nm.asarray(aux, dtype=nm.float64)
fd.close()
else:
nu = None
sp_boxes = ffd.read_spline_box_hdf5(opts.ffd_spline_data)
dsg_vars = ffd.read_dsg_vars_hdf5(opts.ffd_spline_data)
dsg_vars.renumber_by_boxes(sp_boxes)
dsg_vars.normalize_null_space_base()
print dsg_vars.indx.shape
print dsg_vars.null_space_b.shape
control_region = regions[opts.control_domain]
design_region = regions[opts.design_domain]
from sfepy.fem.mesh import Mesh
cmm = Mesh.from_region(control_region, dpb.domain.mesh)
dmm = Mesh.from_region(design_region, dpb.domain.mesh)
cmm.write("control.mesh", io="auto")
dmm.write("design.mesh", io="auto")
SOFC = ShapeOptimFlowCase
obj = SOFC(
dpb=dpb,
apb=apb,
sp_boxes=sp_boxes,
dsg_vars=dsg_vars,
problem_type=opts.problem,
objective_function_type=opts.objective_function,
var_map=opts.var_map,
nu=nu,
use_mesh_velocity=opts.use_mesh_velocity,
save_dir=opts.save_dir,
save_iter_sols=opts.save_iter_sols,
save_control_points=opts.save_control_points,
save_dsg_vars=opts.save_dsg_vars,
test_terms_if_test=opts.test_terms_if_test,
)
equations = getattr(conf, "_".join(("equations_sensitivity", opts.problem, opts.objective_function)))
obj.obj_fun_term = equations["objective"]
obj.sens_terms = equations["sensitivity"]
obj.n_var = dsg_vars.val.shape[0]
obj.create_evaluables()
return obj
def from_conf(conf, dpb, apb):
opts = conf.options
regions = dpb.domain.regions
if opts.use_mesh_velocity:
import tables as pt
fd = pt.open_file(opts.mesh_velocity_filename, mode='r')
aux = fd.get_node('/u').read()
nu = nm.asarray(aux, dtype=nm.float64)
fd.close()
else:
nu = None
sp_boxes = ffd.read_spline_box_hdf5(opts.ffd_spline_data)
dsg_vars = ffd.read_dsg_vars_hdf5(opts.ffd_spline_data)
dsg_vars.renumber_by_boxes(sp_boxes)
dsg_vars.normalize_null_space_base()
print dsg_vars.indx.shape
print dsg_vars.null_space_b.shape
control_region = regions[opts.control_domain]
design_region = regions[opts.design_domain]
from sfepy.fem.mesh import Mesh
cmm = Mesh.from_region(control_region, dpb.domain.mesh)
dmm = Mesh.from_region(design_region, dpb.domain.mesh)
cmm.write('control.mesh', io='auto')
dmm.write('design.mesh', io='auto')
SOFC = ShapeOptimFlowCase
obj = SOFC(dpb=dpb,
apb=apb,
sp_boxes=sp_boxes,
dsg_vars=dsg_vars,
problem_type=opts.problem,
objective_function_type=opts.objective_function,
var_map=opts.var_map,
nu=nu,
use_mesh_velocity=opts.use_mesh_velocity,
save_dir=opts.save_dir,
save_iter_sols=opts.save_iter_sols,
save_control_points=opts.save_control_points,
save_dsg_vars=opts.save_dsg_vars,
test_terms_if_test=opts.test_terms_if_test)
equations = getattr(
conf, '_'.join(('equations_sensitivity', opts.problem,
opts.objective_function)))
obj.obj_fun_term = equations['objective']
obj.sens_terms = equations['sensitivity']
obj.n_var = dsg_vars.val.shape[0]
obj.create_evaluables()
return obj
def dump_to_vtk(filename, output_filename_trunk=None, step0=0, steps=None,
fields=None, linearization=None):
"""Dump a multi-time-step results file into a sequence of VTK files."""
def _save_step(suffix, out, mesh):
if linearization is not None:
output('linearizing...')
out = _linearize(out, fields, linearization)
output('...done')
for key, val in out.iteritems():
lmesh = val.get('mesh', mesh)
lmesh.write(output_filename_trunk + '_' + key + suffix,
io='auto', out={key : val})
if hasattr(val, 'levels'):
output('max. refinement per group:', val.levels)
else:
mesh.write(output_filename_trunk + suffix, io='auto', out=out)
output('dumping to VTK...')
io = MeshIO.any_from_filename(filename)
mesh = Mesh.from_file(filename, io=io)
if output_filename_trunk is None:
output_filename_trunk = get_trunk(filename)
try:
ts = TimeStepper(*io.read_time_stepper())
times, nts, dts = extract_times(filename)
except ValueError:
output('no time stepping info found, assuming single step')
out = io.read_data(0)
if out is not None:
_save_step('.vtk', out, mesh)
ret = None
else:
ts.times = times
ts.n_step = times.shape[0]
if steps is None:
iterator = ts.iter_from(step0)
else:
iterator = [(step, ts.times[step]) for step in steps]
for step, time in iterator:
output(ts.format % (step, ts.n_step - 1))
out = io.read_data(step)
if out is None: break
_save_step('.' + ts.suffix % step + '.vtk', out, mesh)
ret = ts.suffix
output('...done')
return ret
def dump_to_vtk( filename, options, steps = None ):
output( 'dumping to VTK...' )
mesh = Mesh.from_file( filename )
io = HDF5MeshIO( filename )
ts = TimeStepper( *io.read_time_stepper() )
if options.output_filename_trunk:
ofn_trunk = options.output_filename_trunk
else:
ofn_trunk = get_trunk( filename )
if steps is None:
iterator = ts.iter_from( options.step0 )
else:
iterator = [(step, ts.times[step]) for step in steps]
for step, time in iterator:
output( ts.format % (step, ts.n_step - 1) )
out = io.read_data( step )
if out is None: break
mesh.write( ofn_trunk + ts.suffix % step + '.vtk',
io = 'auto', out = out )
output( '...done' )
return ts.suffix
def main():
parser = OptionParser(usage=usage, version="%prog 42")
parser.add_option("-s", "--scale", type=int, metavar='scale',
action="store", dest="scale",
default=2, help=help['scale'])
parser.add_option("-r", "--repeat", type='str', metavar='nx,ny[,nz]',
action="callback", dest="repeat",
callback=parse_repeat, default=None, help=help['repeat'])
parser.add_option("-e", "--eps", type=float, metavar='eps',
action="store", dest="eps",
default=1e-8, help=help['eps'])
(options, args) = parser.parse_args()
if (len( args ) == 2):
filename_in = args[0]
filename_out = args[1]
else:
parser.print_help()
return
output = Output('genPerMesh:')
output('scale:', options.scale)
output('repeat:', options.repeat)
output('eps:', options.eps)
mesh_in = Mesh.from_file(filename_in)
mesh_out = gen_tiled_mesh(mesh_in, options.repeat, 1./options.scale,
options.eps)
mesh_out.write(filename_out, io='auto')
output('done.')
def create_mesh(self, extra_nodes=True):
"""
Create a mesh from the field region, optionally including the field
extra nodes.
"""
mesh = self.domain.mesh
if self.approx_order != 0:
conns, mat_ids, descs = [], [], []
for ig, ap in self.aps.iteritems():
group = self.domain.groups[ig]
if extra_nodes:
conn = ap.econn
else:
offset = group.shape.n_ep
conn = ap.econn[:,:offset]
conns.append(conn)
mat_ids.append(mesh.mat_ids[ig])
descs.append(mesh.descs[ig])
if extra_nodes:
coors = self.coors
else:
coors = self.coors[:self.n_vertex_dof]
mesh = Mesh.from_data(self.name, coors, None, conns,
mat_ids, descs)
return mesh
def gen_block_mesh(dims, shape, centre, mat_id=0, name='block',
coors=None, verbose=True):
"""
Generate a 2D or 3D block mesh. The dimension is determined by the
lenght of the shape argument.
Parameters
----------
dims : array of 2 or 3 floats
Dimensions of the block.
shape : array of 2 or 3 ints
Shape (counts of nodes in x, y, z) of the block mesh.
centre : array of 2 or 3 floats
Centre of the block.
mat_id : int, optional
The material id of all elements.
name : string
Mesh name.
verbose : bool
If True, show progress of the mesh generation.
Returns
-------
mesh : Mesh instance
"""
dims = nm.asarray(dims, dtype=nm.float64)
shape = nm.asarray(shape, dtype=nm.int32)
centre = nm.asarray(centre, dtype=nm.float64)
dim = shape.shape[0]
centre = centre[:dim]
dims = dims[:dim]
n_nod = nm.prod(shape)
output('generating %d vertices...' % n_nod, verbose=verbose)
x0 = centre - 0.5 * dims
dd = dims / (shape - 1)
ngrid = nm.mgrid[[slice(ii) for ii in shape]]
ngrid.shape = (dim, n_nod)
coors = x0 + ngrid.T * dd
output('...done', verbose=verbose)
n_el = nm.prod(shape - 1)
output('generating %d cells...' % n_el, verbose=verbose)
mat_ids = nm.empty((n_el,), dtype=nm.int32)
mat_ids.fill(mat_id)
conn, desc = get_tensor_product_conn(shape)
output('...done', verbose=verbose)
mesh = Mesh.from_data(name, coors, None, [conn], [mat_ids], [desc])
return mesh
def test_mesh_smoothing(self):
from sfepy.mesh.mesh_tools import smooth_mesh
from sfepy.fem.mesh import Mesh
from sfepy import data_dir
mesh = Mesh.from_file(data_dir + '/meshes/3d/cylinder.vtk')
vol0 = get_volume(mesh.conns[0], mesh.coors)
mesh.coors = smooth_mesh(mesh, n_iter=10)
vol1 = get_volume(mesh.conns[0], mesh.coors)
filename = op.join(self.options.out_dir, 'smoothed_cylinder.vtk')
mesh.write(filename)
frac = vol1 / vol0
if (frac < 0.967) and (frac > 0.966):
self.report('mesh smoothed')
return True
else:
self.report('mesh smoothed, volume mismatch!')
return False
def test_mesh_smoothing(self):
from sfepy.mesh.mesh_tools import smooth_mesh
from sfepy.fem.mesh import Mesh
from sfepy import data_dir
mesh = Mesh.from_file(data_dir + '/meshes/3d/cylinder.vtk')
vol0 = get_volume(mesh.conns[0], mesh.coors)
mesh.coors = smooth_mesh(mesh, n_iter=10)
vol1 = get_volume(mesh.conns[0], mesh.coors)
filename = op.join(self.options.out_dir, 'smoothed_cylinder.vtk')
mesh.write(filename)
frac = vol1 / vol0
if (frac < 0.967) and (frac > 0.966):
self.report('mesh smoothed')
return True
else:
self.report('mesh smoothed, volume mismatch!')
return False
def dump_to_vtk(filename, output_filename_trunk=None, step0=0, steps=None):
"""Dump a multi-time-step results file into a sequence of VTK files."""
output('dumping to VTK...')
io = MeshIO.any_from_filename(filename)
mesh = Mesh.from_file(filename, io=io)
if output_filename_trunk is None:
output_filename_trunk = get_trunk(filename)
try:
ts = TimeStepper(*io.read_time_stepper())
except:
output('no time stepping info found, assuming single step')
out = io.read_data(0)
if out is not None:
mesh.write(output_filename_trunk + '.vtk', io='auto', out=out)
ret = None
else:
if steps is None:
iterator = ts.iter_from(step0)
else:
iterator = [(step, ts.times[step]) for step in steps]
for step, time in iterator:
output(ts.format % (step, ts.n_step - 1))
out = io.read_data(step)
if out is None: break
mesh.write('.'.join((output_filename_trunk,
ts.suffix % step, 'vtk')),
io='auto', out=out)
ret = ts.suffix
output('...done')
return ret
def create_mesh_from_control_points( self ):
offset = 0
dim = self.spbs[0].cxyz.shape[1]
coors = nm.empty((0, dim), dtype=nm.float64)
conns = []
mat_ids = []
descs = []
for ib, spb in enumerate( self.spbs ):
n_nod = spb.cxyz.shape[0]
coors = nm.concatenate( (coors, spb.cxyz), 0 )
descs.append( '3_2' )
conn = []
for ij in xrange( spb.cpi.shape[1] ):
for ik in xrange( spb.cpi.shape[2] ):
inx = spb.cpi[:,ij,ik]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
for ij in xrange( spb.cpi.shape[0] ):
for ik in xrange( spb.cpi.shape[2] ):
inx = spb.cpi[ij,:,ik]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
for ij in xrange( spb.cpi.shape[0] ):
for ik in xrange( spb.cpi.shape[1] ):
inx = spb.cpi[ij,ik,:]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
aux = nm.empty(len(conn), dtype=nm.int32)
aux.fill(ib)
mat_ids.append(aux)
conns.append( offset + nm.array( conn, dtype = nm.int32 ) )
offset += n_nod
mesh = Mesh.from_data('control_points', coors, None, conns,
mat_ids, descs)
return mesh
def create_mesh_from_control_points( self ):
offset = 0
dim = self.spbs[0].cxyz.shape[1]
coors = nm.empty((0, dim), dtype=nm.float64)
conns = []
mat_ids = []
descs = []
for ib, spb in enumerate( self.spbs ):
n_nod = spb.cxyz.shape[0]
coors = nm.concatenate( (coors, spb.cxyz), 0 )
descs.append( '3_2' )
conn = []
for ij in xrange( spb.cpi.shape[1] ):
for ik in xrange( spb.cpi.shape[2] ):
inx = spb.cpi[:,ij,ik]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
for ij in xrange( spb.cpi.shape[0] ):
for ik in xrange( spb.cpi.shape[2] ):
inx = spb.cpi[ij,:,ik]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
for ij in xrange( spb.cpi.shape[0] ):
for ik in xrange( spb.cpi.shape[1] ):
inx = spb.cpi[ij,ik,:]
row = [[p1, p2] for p1, p2 in zip( inx[:-1], inx[1:] )]
conn.extend( row )
aux = nm.empty(len(conn), dtype=nm.int32)
aux.fill(ib)
mat_ids.append(aux)
conns.append( offset + nm.array( conn, dtype = nm.int32 ) )
offset += n_nod
mesh = Mesh.from_data('control_points', coors, None, conns,
mat_ids, descs)
return mesh
def main():
parser = OptionParser(usage=usage, version="%prog 42")
parser.add_option(
"-s", "--scale", type=int, metavar="scale", action="store", dest="scale", default=2, help=help["scale"]
)
parser.add_option(
"-r",
"--repeat",
type="str",
metavar="nx,ny[,nz]",
action="callback",
dest="repeat",
callback=parse_repeat,
default=None,
help=help["repeat"],
)
parser.add_option(
"-e", "--eps", type=float, metavar="eps", action="store", dest="eps", default=1e-8, help=help["eps"]
)
parser.add_option("-n", "--no-mvd", action="store_true", dest="nomvd", default=False, help=help["nomvd"])
(options, args) = parser.parse_args()
if len(args) == 2:
filename_in = args[0]
filename_out = args[1]
else:
parser.print_help()
return
output = Output("genPerMesh:")
output("scale:", options.scale)
output("repeat:", options.repeat)
output("eps:", options.eps)
mesh_in = Mesh.from_file(filename_in)
mesh_out = compose_periodic_mesh(mesh_in, options.scale, options.repeat, options.eps, check_mvd=not options.nomvd)
mesh_out.write(filename_out, io="auto")
output("done.")
def gen_mesh_from_poly(filename, verbose=True):
"""
Import mesh generated by tetgen or triangle.
Parameters
----------
filename : string
file name
Returns
-------
mesh : Mesh instance
triangular or tetrahedral mesh
"""
def getnodes(fnods, up):
f = file(fnods)
l = [int(x) for x in f.readline().split()]
npoints, dim, nattrib, nbound = l
if verbose: up.init(npoints)
nodes = []
for line in f:
if line[0] == "#": continue
l = [float(x) for x in line.split()]
l = l[:(dim + 1)]
l[0] = int(l[0])
nodes.append(tuple(l))
assert l[0] == len(nodes)
assert npoints == len(nodes)
return nodes
def getele(fele, up):
f = file(fele)
l = [int(x) for x in f.readline().split()]
nele, nnod, nattrib = l
#we have either linear or quadratic tetrahedra:
if nnod in [4, 10]:
elem = 'tetra'
linear = (nnod == 4)
if nnod in [3, 7]:
elem = 'tri'
linear = (nnod == 3)
# if nattrib!=1:
# raise "tetgen didn't assign an entity number to each element (option -A)"
els = []
regions = {}
for line in f:
if line[0] == "#": continue
l = [int(x) for x in line.split()]
if elem == 'tri':
if linear:
assert (len(l) - 1 - nattrib) == 3
els.append((l[0], l[1], l[2], l[3]))
regionnum = l[5]
else:
assert len(l) - 2 == 10
els.append((l[0], 54, l[1], l[2], l[3], l[4], l[5], l[6],
l[7], l[8], l[9], l[10]))
regionnum = l[11]
if elem == 'tetra':
if linear:
assert len(l) - 2 == 4
els.append((l[0], 54, l[1], l[2], l[3], l[4]))
regionnum = l[5]
else:
assert len(l) - 2 == 10
els.append((l[0], 54, l[1], l[2], l[3], l[4], l[5], l[6],
l[7], l[8], l[9], l[10]))
regionnum = l[11]
if regionnum == 0:
print "see %s, element # %d" % (fele, l[0])
raise "there are elements not belonging to any physical entity"
if regions.has_key(regionnum):
regions[regionnum].append(l[0])
else:
regions[regionnum] = [l[0]]
assert l[0] == len(els)
if verbose: up.update(l[0])
return els, regions, linear
def getBCfaces(ffaces, up):
f = file(ffaces)
l = [int(x) for x in f.readline().split()]
nfaces, nattrib = l
if nattrib != 1:
raise "tetgen didn't assign an entity number to each face \
(option -A)"
if verbose: up.init(nfaces)
faces = {}
for line in f:
if line[0] == "#": continue
l = [int(x) for x in line.split()]
assert len(l) == 5
regionnum = l[4]
if regionnum == 0: continue
if faces.has_key(regionnum):
faces[regionnum].append((l[1], l[2], l[3]))
else:
faces[regionnum] = [(l[1], l[2], l[3])]
if verbose: up.update(l[0])
return faces
def calculatexyz(nodes, els):
"""Calculate the missing xyz values in place"""
def avg(i, j, n4, nodes):
a = nodes[n4[i - 1] - 1]
b = nodes[n4[j - 1] - 1]
return (a[1] + b[1]) / 2, (a[2] + b[2]) / 2, (a[3] + b[3]) / 2
def getxyz(i, n4, nodes):
if i + 5 == 5: return avg(1, 2, n4, nodes)
if i + 5 == 6: return avg(2, 3, n4, nodes)
if i + 5 == 7: return avg(1, 3, n4, nodes)
if i + 5 == 8: return avg(1, 4, n4, nodes)
if i + 5 == 9: return avg(2, 4, n4, nodes)
if i + 5 == 10: return avg(3, 4, n4, nodes)
raise "wrong topology"
for e in els:
n4 = e[2:2 + 4]
n6 = e[2 + 4:2 + 4 + 10]
for i, n in enumerate(n6):
x, y, z = getxyz(i, n4, nodes)
nodes[n - 1] = (n, x, y, z)
if verbose: print "Reading geometry from poly file..."
m = Mesh()
m.nodes = getnodes(filename + ".node")
m.elements, m.regions, lin = getele(filename + ".ele")
if not lin:
#tetgen doesn't compute xyz coordinates of the aditional 6 nodes
#(only of the 4 corner nodes) in tetrahedra.
calculatexyz(m.nodes, m.elements)
m.faces = getBCfaces(filename + ".face")
return m
def gen_block_mesh(dims, shape, centre, name='block'):
"""
Generate a 2D or 3D block mesh. The dimension is determined by the
lenght of the shape argument.
Parameters
----------
dims : array of 2 or 3 floats
Dimensions of the block.
shape : array of 2 or 3 ints
Shape (counts of nodes in x, y, z) of the block mesh.
centre : array of 2 or 3 floats
Centre of the block.
name : string
Mesh name.
Returns
-------
mesh : Mesh instance
"""
dims = nm.asarray(dims, dtype=nm.float64)
shape = nm.asarray(shape, dtype=nm.int32)
centre = nm.asarray(centre, dtype=nm.float64)
dim = shape.shape[0]
centre = centre[:dim]
dims = dims[:dim]
x0 = centre - 0.5 * dims
dd = dims / (shape - 1)
grid = nm.zeros(shape, dtype = nm.int32)
n_nod = nm.prod(shape)
coors = nm.zeros((n_nod, dim), dtype = nm.float64)
bar = MyBar(" nodes:")
bar.init(n_nod)
for ii, ic in enumerate(cycle(shape)):
grid[tuple(ic)] = ii
coors[ii] = x0 + ic * dd
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
n_el = nm.prod(shape - 1)
mat_id = nm.zeros((n_el,), dtype = nm.int32)
if (dim == 2):
conn = nm.zeros((n_el, 4), dtype = nm.int32)
bar = MyBar(" elements:")
bar.init(n_el)
for ii, (ix, iy) in enumerate(cycle(shape - 1)):
conn[ii,:] = [grid[ix ,iy], grid[ix+1,iy ],
grid[ix+1,iy+1], grid[ix ,iy+1]]
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
desc = '2_4'
else:
conn = nm.zeros((n_el, 8), dtype = nm.int32)
bar = MyBar(" elements:")
bar.init(n_el)
for ii, (ix, iy, iz) in enumerate(cycle(shape - 1)):
conn[ii,:] = [grid[ix ,iy ,iz ], grid[ix+1,iy ,iz ],
grid[ix+1,iy+1,iz ], grid[ix ,iy+1,iz ],
grid[ix ,iy ,iz+1], grid[ix+1,iy ,iz+1],
grid[ix+1,iy+1,iz+1], grid[ix ,iy+1,iz+1]]
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
desc = '3_8'
mesh = Mesh.from_data(name, coors, None, [conn], [mat_id], [desc])
return mesh
def gen_cylinder_mesh(dims, shape, centre, axis='x', force_hollow=False,
is_open=False, open_angle=0.0, non_uniform=False,
name='cylinder'):
"""
Generate a cylindrical mesh along an axis. Its cross-section can be
ellipsoidal.
Parameters
----------
axis: one of 'x', 'y', 'z'
The axis of the cylinder.
dims : array of 5 floats
Dimensions of the cylinder: inner surface semi-axes a1, b1, outer
surface semi-axes a2, b2, length.
shape : array of 3 ints
Shape (counts of nodes in radial, circumferential and longitudinal
directions) of the cylinder mesh.
centre : array of 3 floats
Centre of the cylinder.
force_hollow : boolean
Force hollow mesh even if inner radii a1 = b1 = 0.
is_open : boolean
Generate an open cylinder segment.
open_angle : float
Opening angle in radians.
non_uniform : boolean
If True, space the mesh nodes in radial direction so that the element
volumes are (approximately) the same, making thus the elements towards
the outer surface thinner.
name : string
Mesh name.
Returns
-------
mesh : Mesh instance
"""
dims = nm.asarray(dims, dtype=nm.float64)
shape = nm.asarray(shape, dtype=nm.int32)
centre = nm.asarray(centre, dtype=nm.float64)
a1, b1, a2, b2, length = dims
nr, nfi, nl = shape
origin = centre - nm.array([0.5 * length, 0.0, 0.0])
dfi = 2.0 * (nm.pi - open_angle) / nfi
if is_open:
nnfi = nfi + 1
else:
nnfi = nfi
is_hollow = force_hollow or not (max(abs(a1), abs(b1)) < 1e-15)
if is_hollow:
mr = 0
else:
mr = (nnfi - 1) * nl
grid = nm.zeros((nr, nnfi, nl), dtype=nm.int32)
n_nod = nr * nnfi * nl - mr
coors = nm.zeros((n_nod, 3), dtype=nm.float64)
angles = nm.linspace(open_angle, open_angle+(nfi)*dfi, nfi+1)
xs = nm.linspace(0.0, length, nl)
if non_uniform:
ras = nm.zeros((nr,), dtype=nm.float64)
rbs = nm.zeros_like(ras)
advol = (a2**2 - a1**2) / (nr - 1)
bdvol = (b2**2 - b1**2) / (nr - 1)
ras[0], rbs[0] = a1, b1
for ii in range(1, nr):
ras[ii] = nm.sqrt(advol + ras[ii-1]**2)
rbs[ii] = nm.sqrt(bdvol + rbs[ii-1]**2)
else:
ras = nm.linspace(a1, a2, nr)
rbs = nm.linspace(b1, b2, nr)
# This is 3D only...
bar = MyBar(" nodes:")
bar.init(n_nod)
ii = 0
for ix in range(nr):
a, b = ras[ix], rbs[ix]
for iy, fi in enumerate(angles[:nnfi]):
for iz, x in enumerate(xs):
grid[ix,iy,iz] = ii
coors[ii] = origin + [x, a * nm.cos(fi), b * nm.sin(fi)]
if not (ii % 100):
bar.update(ii)
ii += 1
if not is_hollow and (ix == 0):
if iy > 0:
grid[ix,iy,iz] = grid[ix,0,iz]
ii -= 1
print
assert_(ii == n_nod)
n_el = (nr - 1) * nnfi * (nl - 1)
conn = nm.zeros((n_el, 8), dtype=nm.int32)
bar = MyBar(" elements:")
bar.init(n_el)
ii = 0
for (ix, iy, iz) in cycle([nr-1, nnfi, nl-1]):
if iy < (nnfi - 1):
conn[ii,:] = [grid[ix ,iy ,iz ], grid[ix+1,iy ,iz ],
grid[ix+1,iy+1,iz ], grid[ix ,iy+1,iz ],
grid[ix ,iy ,iz+1], grid[ix+1,iy ,iz+1],
grid[ix+1,iy+1,iz+1], grid[ix ,iy+1,iz+1]]
ii += 1
elif not is_open:
conn[ii,:] = [grid[ix ,iy ,iz ], grid[ix+1,iy ,iz ],
grid[ix+1,0,iz ], grid[ix ,0,iz ],
grid[ix ,iy ,iz+1], grid[ix+1,iy ,iz+1],
grid[ix+1,0,iz+1], grid[ix ,0,iz+1]]
ii += 1
if not (ii % 100):
bar.update(ii)
print
mat_id = nm.zeros((n_el,), dtype = nm.int32)
desc = '3_8'
assert_(n_nod == (conn.max() + 1))
if axis == 'z':
coors = coors[:,[1,2,0]]
elif axis == 'y':
coors = coors[:,[2,0,1]]
mesh = Mesh.from_data(name, coors, None, [conn], [mat_id], [desc])
return mesh
def gen_mesh_from_poly(filename, verbose=True):
"""
Import mesh generated by tetgen or triangle.
Parameters
----------
filename : string
file name
Returns
-------
mesh : Mesh instance
triangular or tetrahedral mesh
"""
def getnodes(fnods,up):
f=file(fnods)
l=[int(x) for x in f.readline().split()]
npoints,dim,nattrib,nbound=l
if verbose: up.init(npoints)
nodes=[]
for line in f:
if line[0]=="#": continue
l=[float(x) for x in line.split()]
l = l[:(dim + 1)]
l[0]=int(l[0])
nodes.append(tuple(l))
assert l[0]==len(nodes)
assert npoints==len(nodes)
return nodes
def getele(fele,up):
f=file(fele)
l=[int(x) for x in f.readline().split()]
nele,nnod,nattrib=l
#we have either linear or quadratic tetrahedra:
if nnod in [4,10]:
elem = 'tetra'
linear = (nnod == 4)
if nnod in [3, 7]:
elem = 'tri'
linear = (nnod == 3)
# if nattrib!=1:
# raise "tetgen didn't assign an entity number to each element (option -A)"
els=[]
regions={}
for line in f:
if line[0]=="#": continue
l=[int(x) for x in line.split()]
if elem == 'tri':
if linear:
assert (len(l) - 1 - nattrib) == 3
els.append((l[0],l[1],l[2],l[3]))
regionnum=l[5]
else:
assert len(l)-2 == 10
els.append((l[0],54,l[1],l[2],l[3],l[4],
l[5],l[6],l[7],l[8],l[9],l[10]))
regionnum=l[11]
if elem == 'tetra':
if linear:
assert len(l)-2 == 4
els.append((l[0],54,l[1],l[2],l[3],l[4]))
regionnum=l[5]
else:
assert len(l)-2 == 10
els.append((l[0],54,l[1],l[2],l[3],l[4],
l[5],l[6],l[7],l[8],l[9],l[10]))
regionnum=l[11]
if regionnum==0:
print "see %s, element # %d"%(fele,l[0])
raise "there are elements not belonging to any physical entity"
if regions.has_key(regionnum):
regions[regionnum].append(l[0])
else:
regions[regionnum]=[l[0]]
assert l[0]==len(els)
if verbose: up.update(l[0])
return els,regions,linear
def getBCfaces(ffaces,up):
f=file(ffaces)
l=[int(x) for x in f.readline().split()]
nfaces,nattrib=l
if nattrib!=1:
raise "tetgen didn't assign an entity number to each face \
(option -A)"
if verbose: up.init(nfaces)
faces={}
for line in f:
if line[0]=="#": continue
l=[int(x) for x in line.split()]
assert len(l)==5
regionnum=l[4]
if regionnum==0: continue
if faces.has_key(regionnum):
faces[regionnum].append((l[1],l[2],l[3]))
else:
faces[regionnum]=[(l[1],l[2],l[3])]
if verbose: up.update(l[0])
return faces
def calculatexyz(nodes, els):
"""Calculate the missing xyz values in place"""
def avg(i,j,n4,nodes):
a=nodes[n4[i-1]-1]
b=nodes[n4[j-1]-1]
return (a[1]+b[1])/2, (a[2]+b[2])/2, (a[3]+b[3])/2
def getxyz(i,n4,nodes):
if i+5==5: return avg(1,2,n4,nodes)
if i+5==6: return avg(2,3,n4,nodes)
if i+5==7: return avg(1,3,n4,nodes)
if i+5==8: return avg(1,4,n4,nodes)
if i+5==9: return avg(2,4,n4,nodes)
if i+5==10: return avg(3,4,n4,nodes)
raise "wrong topology"
for e in els:
n4=e[2:2+4]
n6=e[2+4:2+4+10]
for i,n in enumerate(n6):
x,y,z=getxyz(i,n4,nodes)
nodes[n-1]=(n,x,y,z)
if verbose: print "Reading geometry from poly file..."
m=Mesh()
m.nodes=getnodes(filename+".node")
m.elements,m.regions, lin=getele(filename+".ele")
if not lin:
#tetgen doesn't compute xyz coordinates of the aditional 6 nodes
#(only of the 4 corner nodes) in tetrahedra.
calculatexyz(m.nodes,m.elements)
m.faces=getBCfaces(filename+".face")
return m
def create_expression_output(expression, name, primary_field_name,
fields, materials, variables,
functions=None, mode='eval', term_mode=None,
extra_args=None, verbose=True, kwargs=None,
min_level=0, max_level=1, eps=1e-4):
"""
Create output mesh and data for the expression using the adaptive
linearizer.
Parameters
----------
expression : str
The expression to evaluate.
name : str
The name of the data.
primary_field_name : str
The name of field that defines the element groups and polynomial
spaces.
fields : dict
The dictionary of fields used in `variables`.
materials : Materials instance
The materials used in the expression.
variables : Variables instance
The variables used in the expression.
functions : Functions instance, optional
The user functions for materials etc.
mode : one of 'eval', 'el_avg', 'qp'
The evaluation mode - 'qp' requests the values in quadrature points,
'el_avg' element averages and 'eval' means integration over
each term region.
term_mode : str
The term call mode - some terms support different call modes
and depending on the call mode different values are
returned.
extra_args : dict, optional
Extra arguments to be passed to terms in the expression.
verbose : bool
If False, reduce verbosity.
kwargs : dict, optional
The variables (dictionary of (variable name) : (Variable
instance)) to be used in the expression.
min_level : int
The minimum required level of mesh refinement.
max_level : int
The maximum level of mesh refinement.
eps : float
The relative tolerance parameter of mesh adaptivity.
Returns
-------
out : dict
The output dictionary.
"""
field = fields[primary_field_name]
vertex_coors = field.coors[:field.n_vertex_dof, :]
coors = []
vdofs = []
conns = []
mat_ids = []
levels = []
offset = 0
for ig, ap in field.aps.iteritems():
ps = ap.interp.poly_spaces['v']
gps = ap.interp.gel.interp.poly_spaces['v']
group = field.domain.groups[ig]
vertex_conn = ap.econn[:, :group.shape.n_ep]
eval_dofs = get_eval_expression(expression, ig,
fields, materials, variables,
functions=functions,
mode=mode, extra_args=extra_args,
verbose=verbose, kwargs=kwargs)
eval_coors = get_eval_coors(vertex_coors, vertex_conn, gps)
(level, _coors, conn,
_vdofs, _mat_ids) = create_output(eval_dofs, eval_coors,
group.shape.n_el, ps,
min_level=min_level,
max_level=max_level, eps=eps)
_mat_ids[:] = field.domain.mesh.mat_ids[ig][0]
coors.append(_coors)
vdofs.append(_vdofs)
conns.append(conn + offset)
mat_ids.append(_mat_ids)
levels.append(level)
offset += _coors.shape[0]
coors = nm.concatenate(coors, axis=0)
vdofs = nm.concatenate(vdofs, axis=0)
mesh = Mesh.from_data('linearized_mesh', coors, None, conns, mat_ids,
field.domain.mesh.descs)
out = {}
out[name] = Struct(name='output_data', mode='vertex',
data=vdofs, var_name=name, dofs=None,
mesh=mesh, levels=levels)
out = convert_complex_output(out)
return out
def gen_mesh_from_goem(geo,
a=None,
quadratic=False,
verbose=True,
refine=False,
polyfilename='./meshgen.poly',
out='mesh',
**kwargs):
"""
Runs mesh generator - tetgen for 3D or triangle for 2D meshes.
Parameters
----------
geo : geometry
geometry description
a : int, optional
a maximum area/volume constraint
quadratic : bool, optional
set True for quadratic elements
verbose : bool, optional
detailed information
refine : bool, optional
refines mesh
Returns
-------
mesh : Mesh instance
triangular or tetrahedral mesh
"""
import os.path as op
import pexpect
# write geometry to poly file
geo.to_poly_file(polyfilename)
if not refine:
params = "-Apq"
else:
params = "-Arq"
if verbose:
params = params + " -Q"
if a != None and not refine:
params = params + " -a%f" % (a)
if refine:
params = params + " -a"
if quadratic:
params = params + " -o2"
params = params + " %s" % (polyfilename)
meshgen_call = {2: 'triangle', 3: 'tetgen'}
cmd = "%s %s" % (meshgen_call[geo.dim], params)
if verbose: print "Generating mesh using", cmd
if geo.dim == 2:
p = pexpect.run(cmd, timeout=None)
bname, ext = op.splitext(polyfilename)
mesh = Mesh.from_file(bname + '.1.node')
mesh.write(bname + '.' + out)
if geo.dim == 3:
p = pexpect.spawn(cmd, timeout=None)
if not refine:
p.expect("Opening %s." % (polyfilename))
else:
p.expect("Opening %s.node.\r\n" % (polyfilename))
p.expect("Opening %s.ele.\r\n" % (polyfilename))
p.expect("Opening %s.face.\r\n" % (polyfilename))
p.expect("Opening %s.vol." % (polyfilename))
assert p.before == ""
p.expect(pexpect.EOF)
if p.before != "\r\n":
print p.before
raise "Error when running mesh generator (see above for output): %s" % cmd
def gen_block_mesh(dims, shape, centre, mat_id=0, name='block', verbose=True):
"""
Generate a 2D or 3D block mesh. The dimension is determined by the
lenght of the shape argument.
Parameters
----------
dims : array of 2 or 3 floats
Dimensions of the block.
shape : array of 2 or 3 ints
Shape (counts of nodes in x, y, z) of the block mesh.
centre : array of 2 or 3 floats
Centre of the block.
mat_id : int, optional
The material id of all elements.
name : string
Mesh name.
verbose : bool
If True, show progress of the mesh generation.
Returns
-------
mesh : Mesh instance
"""
dims = nm.asarray(dims, dtype=nm.float64)
shape = nm.asarray(shape, dtype=nm.int32)
centre = nm.asarray(centre, dtype=nm.float64)
dim = shape.shape[0]
centre = centre[:dim]
dims = dims[:dim]
x0 = centre - 0.5 * dims
dd = dims / (shape - 1)
grid = nm.zeros(shape, dtype=nm.int32)
n_nod = nm.prod(shape)
coors = nm.zeros((n_nod, dim), dtype=nm.float64)
bar = MyBar(" nodes:", verbose=verbose)
bar.init(n_nod)
for ii, ic in enumerate(cycle(shape)):
grid[tuple(ic)] = ii
coors[ii] = x0 + ic * dd
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
n_el = nm.prod(shape - 1)
mat_ids = nm.empty((n_el, ), dtype=nm.int32)
mat_ids.fill(mat_id)
if (dim == 2):
conn = nm.zeros((n_el, 4), dtype=nm.int32)
bar = MyBar(" elements:", verbose=verbose)
bar.init(n_el)
for ii, (ix, iy) in enumerate(cycle(shape - 1)):
conn[ii, :] = [
grid[ix, iy], grid[ix + 1, iy], grid[ix + 1, iy + 1],
grid[ix, iy + 1]
]
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
desc = '2_4'
else:
conn = nm.zeros((n_el, 8), dtype=nm.int32)
bar = MyBar(" elements:", verbose=verbose)
bar.init(n_el)
for ii, (ix, iy, iz) in enumerate(cycle(shape - 1)):
conn[ii, :] = [
grid[ix, iy, iz], grid[ix + 1, iy, iz], grid[ix + 1, iy + 1,
iz],
grid[ix, iy + 1, iz], grid[ix, iy, iz + 1], grid[ix + 1, iy,
iz + 1],
grid[ix + 1, iy + 1, iz + 1], grid[ix, iy + 1, iz + 1]
]
if not (ii % 100):
bar.update(ii)
bar.update(ii + 1)
desc = '3_8'
mesh = Mesh.from_data(name, coors, None, [conn], [mat_ids], [desc])
return mesh
def extract_time_history( filename, options ):
output( 'extracting selected data...' )
el = options.extract_list
output( 'extraction list:', el )
##
# Parse extractions.
pes = OneTypeList( Struct )
for chunk in el.split( ',' ):
aux = chunk.strip().split()
pes.append( Struct( var = aux[0],
mode = aux[1],
indx = map( int, aux[2:] ),
igs = None ) )
##
# Verify array limits, set igs for element data, shift indx.
mesh = Mesh.from_file( filename )
n_el, n_els, offs = mesh.n_el, mesh.n_els, mesh.el_offsets
for pe in pes:
if pe.mode == 'n':
for ii in pe.indx:
if (ii < 0) or (ii >= mesh.n_nod):
raise IndexError, 'node index 0 <= %d < %d'\
% (ii, mesh.n_nod)
if pe.mode == 'e':
pe.igs = []
for ii, ie in enumerate( pe.indx[:] ):
if (ie < 0) or (ie >= n_el):
raise IndexError, 'element index 0 <= %d < %d'\
% (ie, n_el)
ig = (ie < n_els).argmax()
pe.igs.append( ig )
pe.indx[ii] = ie - offs[ig]
## print pes
##
# Extract data.
# Assumes only one element group (ignores igs)!
io = HDF5MeshIO( filename )
ths = {}
for pe in pes:
mode, nname = io.read_data_header( pe.var )
print mode, nname
if ((pe.mode == 'n' and mode == 'vertex') or
(pe.mode == 'e' and mode == 'cell')):
th = io.read_time_history( nname, pe.indx )
elif pe.mode == 'e' and mode == 'vertex':
conn = mesh.conns[0]
th = {}
for iel in pe.indx:
ips = conn[iel]
th[iel] = io.read_time_history( nname, ips )
else:
raise RuntimeError, 'cannot extract cell data %s in nodes' % pe.var
ths[pe.var] = th
return ths
def main():
parser = OptionParser( usage = usage, version = "%prog 42" )
parser.add_option( "-s", "--scale", type = int, metavar = 'scale',
action = "store", dest = "scale",
default = 2, help = help['scale'] )
parser.add_option( "-e", "--eps", type = float, metavar = 'eps',
action = "store", dest = "eps",
default = 1e-8, help = help['eps'] )
parser.add_option( "-t", "--test",
action = "store_true", dest = "test",
default = False, help = help['test'] )
parser.add_option( "-n", "--no-mvd",
action = "store_true", dest = "nomvd",
default = False, help = help['nomvd'] )
(options, args) = parser.parse_args()
if options.test:
test()
return
if (len( args ) == 2):
filename_in = args[0]
filename_out = args[1]
else:
parser.print_help()
return
print 'scale:', options.scale
print 'eps:', options.eps
mesh_in = Mesh.from_file( filename_in )
bbox = mesh_in.get_bounding_box()
print 'bbox:\n', bbox
mscale = bbox[1] - bbox[0]
centre0 = 0.5 * (bbox[1] + bbox[0])
print 'centre:\n', centre0
scale = nm.array( options.scale, dtype = nm.float64 )
# Normalize original coordinates.
coor0 = (mesh_in.nod0[:,:-1] - centre0) / (mscale)
dim = mesh_in.dim
coor0, mesh_in.conns = fix_double_nodes( coor0, mesh_in.conns, options.eps )
if not options.nomvd:
mes0 = get_min_edge_size( coor0, mesh_in.conns )
mvd0 = get_min_vertex_distance( coor0, mes0 )
if mes0 > (mvd0 + options.eps):
print ' original min. "edge" length: %.5e' % mes0
print 'original approx. min. vertex distance: %.5e' % mvd0
print '-> still double nodes in input mesh!'
print 'try increasing eps...'
raise ValueError
for indx in cycle( [options.scale] * dim ):
aindx = nm.array( indx, dtype = nm.float64 )
centre = 0.5 * (2.0 * aindx - scale + 1.0)
print indx, centre
if aindx.sum() == 0:
coor = coor0 + centre
conns = mesh_in.conns
else:
coor1 = coor0 + centre
conns1 = mesh_in.conns
cmap = find_map( coor, coor1, eps = options.eps )
if not cmap.size:
print 'non-periodic mesh!'
# raise ValueError
else:
print cmap.size / 2
coor, conns = merge_mesh( coor, conns, coor1, conns1, cmap,
eps = options.eps )
if not options.nomvd:
mes = get_min_edge_size( coor, conns )
mvd = get_min_vertex_distance( coor, mes0 )
print ' original min. "edge" length: %.5e' % mes0
print ' final min. "edge" length: %.5e' % mes
print 'original approx. min. vertex distance: %.5e' % mvd0
print ' final approx. min. vertex distance: %.5e' % mvd
if mvd < 0.99999 * mvd0:
if mvd0 < (mes0 - options.eps):
print '-> probably non-periodic input mesh!'
print ' ... adjacent sides were not connected!'
print ' try increasing eps...'
else:
print '-> input mesh might be periodic'
print ' try increasing eps...'
else:
print '-> input mesh looks periodic'
else:
print 'non-periodic input mesh detection skipped!'
print 'renormalizing...'
coor = (coor * mscale) / scale
print 'saving...'
mesh_out = make_mesh( coor, conns, mesh_in )
mesh_out.write( filename_out, io = 'auto' )
print 'done.'
def extract_time_history(filename, extract, verbose=True):
"""Extract time history of a variable from a multi-time-step results file.
Parameters
----------
filename : str
The name of file to extract from.
extract : str
The description of what to extract in a string of comma-separated
description items. A description item consists of: name of the variable
to extract, mode ('e' for elements, 'n' for nodes), ids of the nodes or
elements (given by the mode). Example: 'u n 10 15, p e 0' means
variable 'u' in nodes 10, 15 and variable 'p' in element 0.
verbose : bool
Verbosity control.
Returns
-------
ths : dict
The time histories in a dict with variable names as keys. If a
nodal variable is requested in elements, its value is a dict of histories
in the element nodes.
ts : TimeStepper instance
The time stepping information.
"""
output('extracting selected data...', verbose=verbose)
output('selection:', extract, verbose=verbose)
##
# Parse extractions.
pes = OneTypeList(Struct)
for chunk in extract.split(','):
aux = chunk.strip().split()
pes.append(Struct(var = aux[0],
mode = aux[1],
indx = map(int, aux[2:]),
igs = None))
##
# Verify array limits, set igs for element data, shift indx.
mesh = Mesh.from_file(filename)
n_el, n_els, offs = mesh.n_el, mesh.n_els, mesh.el_offsets
for pe in pes:
if pe.mode == 'n':
for ii in pe.indx:
if (ii < 0) or (ii >= mesh.n_nod):
raise ValueError('node index 0 <= %d < %d!'
% (ii, mesh.n_nod))
if pe.mode == 'e':
pe.igs = []
for ii, ie in enumerate(pe.indx[:]):
if (ie < 0) or (ie >= n_el):
raise ValueError('element index 0 <= %d < %d!'
% (ie, n_el))
ig = (ie < n_els).argmax()
pe.igs.append(ig)
pe.indx[ii] = ie - offs[ig]
## print pes
##
# Extract data.
# Assumes only one element group (ignores igs)!
io = MeshIO.any_from_filename(filename)
ths = {}
for pe in pes:
mode, nname = io.read_data_header(pe.var)
output(mode, nname, verbose=verbose)
if ((pe.mode == 'n' and mode == 'vertex') or
(pe.mode == 'e' and mode == 'cell')):
th = io.read_time_history(nname, pe.indx)
elif pe.mode == 'e' and mode == 'vertex':
conn = mesh.conns[0]
th = {}
for iel in pe.indx:
ips = conn[iel]
th[iel] = io.read_time_history(nname, ips)
else:
raise ValueError('cannot extract cell data %s in nodes!' % pe.var)
ths[pe.var] = th
output('...done', verbose=verbose)
ts = TimeStepper(*io.read_time_stepper())
return ths, ts
def linearize(self, dofs, min_level=0, max_level=1, eps=1e-4):
"""
Linearize the solution for post-processing.
Parameters
----------
dofs : array, shape (n_nod, n_component)
The array of DOFs reshaped so that each column corresponds
to one component.
min_level : int
The minimum required level of mesh refinement.
max_level : int
The maximum level of mesh refinement.
eps : float
The relative tolerance parameter of mesh adaptivity.
Returns
-------
mesh : Mesh instance
The adapted, nonconforming, mesh.
vdofs : array
The DOFs defined in vertices of `mesh`.
levels : array of ints
The refinement level used for each element group.
"""
assert_(dofs.ndim == 2)
n_nod, dpn = dofs.shape
assert_(n_nod == self.n_nod)
assert_(dpn == self.shape[0])
vertex_coors = self.coors[:self.n_vertex_dof, :]
coors = []
vdofs = []
conns = []
mat_ids = []
levels = []
offset = 0
for ig, ap in self.aps.iteritems():
ps = ap.interp.poly_spaces['v']
gps = ap.interp.gel.interp.poly_spaces['v']
group = self.domain.groups[ig]
vertex_conn = ap.econn[:, :group.shape.n_ep]
eval_dofs = get_eval_dofs(dofs, ap.econn, ps, ori=ap.ori)
eval_coors = get_eval_coors(vertex_coors, vertex_conn, gps)
(level, _coors, conn,
_vdofs, _mat_ids) = create_output(eval_dofs, eval_coors,
group.shape.n_el, ps,
min_level=min_level,
max_level=max_level, eps=eps)
_mat_ids[:] = self.domain.mesh.mat_ids[ig][0]
coors.append(_coors)
vdofs.append(_vdofs)
conns.append(conn + offset)
mat_ids.append(_mat_ids)
levels.append(level)
offset += _coors.shape[0]
coors = nm.concatenate(coors, axis=0)
vdofs = nm.concatenate(vdofs, axis=0)
mesh = Mesh.from_data('linearized_mesh', coors, None, conns, mat_ids,
self.domain.mesh.descs)
return mesh, vdofs, levels
def main():
parser = OptionParser(usage=usage, version='%prog ' + sfepy.__version__)
parser.add_option('-c',
'--conf',
metavar='"key : value, ..."',
action='store',
dest='conf',
type='string',
default=None,
help=help['conf'])
parser.add_option('-O',
'--options',
metavar='"key : value, ..."',
action='store',
dest='app_options',
type='string',
default=None,
help=help['options'])
parser.add_option('-o',
'',
metavar='filename',
action='store',
dest='output_filename_trunk',
default=None,
help=help['filename'])
parser.add_option('--create-mesh',
action='store_true',
dest='create_mesh',
default=False,
help=help['create_mesh'])
parser.add_option('--2d',
action='store_true',
dest='dim2',
default=False,
help=help['dim'])
parser.add_option('-m',
'--mesh',
metavar='filename',
action='store',
dest='mesh',
default=None,
help=help['mesh'])
parser.add_option('--mesh-dir',
metavar='dirname',
action='store',
dest='mesh_dir',
default='tmp',
help=help['mesh_dir'])
parser.add_option('--oscillator',
action='store_true',
dest='oscillator',
default=False,
help=help['oscillator'])
parser.add_option('--well',
action='store_true',
dest='well',
default=False,
help=help['well'])
parser.add_option('--hydrogen',
action='store_true',
dest='hydrogen',
default=False,
help=help['hydrogen'])
parser.add_option('--boron',
action='store_true',
dest='boron',
default=False,
help=help['boron'])
options, args = parser.parse_args()
if options.create_mesh and options.mesh:
output('--create-mesh and --mesh options are mutually exclusive!')
return
if len(args) == 1:
filename_in = args[0]
auto_mesh_name = False
elif len(args) == 0:
auto_mesh_name = True
mesh_filename = os.path.join(options.mesh_dir, 'mesh.vtk')
ensure_path(mesh_filename)
if options.oscillator:
filename_in = fix_path("examples/quantum/oscillator.py")
elif options.well:
filename_in = fix_path("examples/quantum/well.py")
elif options.hydrogen:
filename_in = fix_path("examples/quantum/hydrogen.py")
elif options.boron:
filename_in = fix_path("examples/quantum/boron.py")
elif options.create_mesh:
output('generating mesh...')
try:
os.makedirs("tmp")
except OSError, e:
if e.errno != 17: # [Errno 17] File exists
raise
if options.dim2:
output("dimension: 2")
gp = fix_path('meshes/quantum/square.geo')
os.system("cp %s tmp/mesh.geo" % gp)
os.system("gmsh -2 tmp/mesh.geo -format mesh")
mtv = fix_path('script/convert_mesh.py')
os.system("%s tmp/mesh.mesh %s" % (mtv, mesh_filename))
else:
output("dimension: 3")
import sfepy.mesh as geom
from sfepy.fem.mesh import Mesh
try:
from site_cfg import tetgen_path
except ImportError:
tetgen_path = '/usr/bin/tetgen'
gp = fix_path('meshes/quantum/box.geo')
os.system("gmsh -0 %s -o tmp/x.geo" % gp)
g = geom.read_gmsh("tmp/x.geo")
g.printinfo()
geom.write_tetgen(g, "tmp/t.poly")
geom.runtetgen("tmp/t.poly",
a=0.03,
Q=1.0,
quadratic=False,
tetgenpath=tetgen_path)
m = Mesh.from_file("tmp/t.1.node")
m.write(mesh_filename, io="auto")
output("...mesh written to %s" % mesh_filename)
return
else:
parser.print_help()
return
def extract_time_history(filename, extract, verbose=True):
"""Extract time history of a variable from a multi-time-step results file.
Parameters
----------
filename : str
The name of file to extract from.
extract : str
The description of what to extract in a string of comma-separated
description items. A description item consists of: name of the variable
to extract, mode ('e' for elements, 'n' for nodes), ids of the nodes or
elements (given by the mode). Example: 'u n 10 15, p e 0' means
variable 'u' in nodes 10, 15 and variable 'p' in element 0.
verbose : bool
Verbosity control.
Returns
-------
ths : dict
The time histories in a dict with variable names as keys. If a
nodal variable is requested in elements, its value is a dict of histories
in the element nodes.
ts : TimeStepper instance
The time stepping information.
"""
output('extracting selected data...', verbose=verbose)
output('selection:', extract, verbose=verbose)
##
# Parse extractions.
pes = OneTypeList(Struct)
for chunk in extract.split(','):
aux = chunk.strip().split()
pes.append(
Struct(var=aux[0], mode=aux[1], indx=map(int, aux[2:]), igs=None))
##
# Verify array limits, set igs for element data, shift indx.
mesh = Mesh.from_file(filename)
n_el, n_els, offs = mesh.n_el, mesh.n_els, mesh.el_offsets
for pe in pes:
if pe.mode == 'n':
for ii in pe.indx:
if (ii < 0) or (ii >= mesh.n_nod):
raise ValueError('node index 0 <= %d < %d!' %
(ii, mesh.n_nod))
if pe.mode == 'e':
pe.igs = []
for ii, ie in enumerate(pe.indx[:]):
if (ie < 0) or (ie >= n_el):
raise ValueError('element index 0 <= %d < %d!' %
(ie, n_el))
ig = (ie < n_els).argmax()
pe.igs.append(ig)
pe.indx[ii] = ie - offs[ig]
## print pes
##
# Extract data.
# Assumes only one element group (ignores igs)!
io = MeshIO.any_from_filename(filename)
ths = {}
for pe in pes:
mode, nname = io.read_data_header(pe.var)
output(mode, nname, verbose=verbose)
if ((pe.mode == 'n' and mode == 'vertex')
or (pe.mode == 'e' and mode == 'cell')):
th = io.read_time_history(nname, pe.indx)
elif pe.mode == 'e' and mode == 'vertex':
conn = mesh.conns[0]
th = {}
for iel in pe.indx:
ips = conn[iel]
th[iel] = io.read_time_history(nname, ips)
else:
raise ValueError('cannot extract cell data %s in nodes!' % pe.var)
ths[pe.var] = th
output('...done', verbose=verbose)
ts = TimeStepper(*io.read_time_stepper())
return ths, ts
def main():
parser = OptionParser(usage=usage, version='%prog ' + sfepy.__version__)
parser.add_option('-c', '--conf', metavar='"key : value, ..."',
action='store', dest='conf', type='string',
default=None, help= help['conf'])
parser.add_option('-O', '--options', metavar='"key : value, ..."',
action='store', dest='app_options', type='string',
default=None, help=help['options'])
parser.add_option('-o', '', metavar='filename',
action='store', dest='output_filename_trunk',
default=None, help=help['filename'])
parser.add_option('--create-mesh',
action='store_true', dest='create_mesh',
default=False, help=help['create_mesh'])
parser.add_option('--2d',
action='store_true', dest='dim2',
default=False, help=help['dim'])
parser.add_option('-m', '--mesh', metavar='filename',
action='store', dest='mesh',
default=None, help=help['mesh'])
parser.add_option('--mesh-dir', metavar='dirname',
action='store', dest='mesh_dir',
default='tmp', help=help['mesh_dir'])
parser.add_option('--oscillator',
action='store_true', dest='oscillator',
default=False, help=help['oscillator'])
parser.add_option('--well',
action='store_true', dest='well',
default=False, help=help['well'])
parser.add_option('--hydrogen',
action='store_true', dest='hydrogen',
default=False, help=help['hydrogen'])
parser.add_option('--boron',
action='store_true', dest='boron',
default=False, help=help['boron'])
options, args = parser.parse_args()
if options.create_mesh and options.mesh:
output('--create-mesh and --mesh options are mutually exclusive!')
return
if len(args) == 1:
filename_in = args[0];
auto_mesh_name = False
elif len(args) == 0:
auto_mesh_name = True
mesh_filename = os.path.join(options.mesh_dir, 'mesh.vtk')
ensure_path(mesh_filename)
if options.oscillator:
filename_in = fix_path("examples/quantum/oscillator.py")
elif options.well:
filename_in = fix_path("examples/quantum/well.py")
elif options.hydrogen:
filename_in = fix_path("examples/quantum/hydrogen.py")
elif options.boron:
filename_in = fix_path("examples/quantum/boron.py")
elif options.create_mesh:
output('generating mesh...')
try:
os.makedirs("tmp")
except OSError, e:
if e.errno != 17: # [Errno 17] File exists
raise
if options.dim2:
output("dimension: 2")
gp = fix_path('meshes/quantum/square.geo')
os.system("cp %s tmp/mesh.geo" % gp)
os.system("gmsh -2 tmp/mesh.geo -format mesh")
mtv = fix_path('script/mesh_to_vtk.py')
os.system("%s tmp/mesh.mesh %s" % (mtv, mesh_filename))
else:
output("dimension: 3")
import sfepy.geom as geom
from sfepy.fem.mesh import Mesh
try:
from site_cfg import tetgen_path
except ImportError:
tetgen_path = '/usr/bin/tetgen'
gp = fix_path('meshes/quantum/box.geo')
os.system("gmsh -0 %s -o tmp/x.geo" % gp)
g = geom.read_gmsh("tmp/x.geo")
g.printinfo()
geom.write_tetgen(g, "tmp/t.poly")
geom.runtetgen("tmp/t.poly", a=0.03, Q=1.0,
quadratic=False, tetgenpath=tetgen_path)
m = Mesh.from_file("tmp/t.1.node")
m.write(mesh_filename, io="auto")
output("...mesh written to %s" % mesh_filename)
return
else:
parser.print_help()
return
def main():
version = open( op.join( init_sfepy.install_dir,
'VERSION' ) ).readlines()[0][:-1]
parser = OptionParser( usage = usage, version = "%prog " + version )
parser.add_option( "--mesh",
action = "store_true", dest = "mesh",
default = False, help = help['mesh'] )
parser.add_option( "--2d",
action = "store_true", dest = "dim2",
default = False, help = help['dim'] )
parser.add_option( "-o", "", metavar = 'filename',
action = "store", dest = "output_filename_trunk",
default = "mesh", help = help['filename'] )
parser.add_option( "--oscillator",
action = "store_true", dest = "oscillator",
default = False, help = help['oscillator'] )
parser.add_option( "--well",
action = "store_true", dest = "well",
default = False, help = help['well'] )
parser.add_option( "--hydrogen",
action = "store_true", dest = "hydrogen",
default = False, help = help['hydrogen'] )
parser.add_option( "--boron",
action = "store_true", dest = "boron",
default = False, help = help['boron'] )
parser.add_option( "--dft",
action = "store_true", dest = "dft",
default = False, help = help['dft'] )
parser.add_option( "-p", "--plot",
action = "store_true", dest = "plot",
default = False, help = help['plot'] )
options, args = parser.parse_args()
if len( args ) == 1:
filename_in = args[0];
elif len( args ) == 0:
if options.oscillator:
dim = MeshIO.any_from_filename("tmp/mesh.vtk").read_dimension()
if dim == 2:
filename_in = "input/quantum/oscillator2d.py"
else:
assert_( dim == 3 )
filename_in = "input/quantum/oscillator3d.py"
options.dim = dim
print "Dimension:", dim
elif options.well:
dim = MeshIO.any_from_filename("tmp/mesh.vtk").read_dimension()
if dim == 2:
filename_in = "input/quantum/well2d.py"
else:
assert_( dim == 3 )
filename_in = "input/quantum/well3d.py"
options.dim = dim
print "Dimension:", dim
elif options.hydrogen:
dim = MeshIO.any_from_filename("tmp/mesh.vtk").read_dimension()
if dim == 2:
filename_in = "input/quantum/hydrogen2d.py"
else:
assert_( dim == 3 )
filename_in = "input/quantum/hydrogen3d.py"
options.dim = dim
print "Dimension:", dim
elif options.boron:
dim = MeshIO.any_from_filename("tmp/mesh.vtk").read_dimension()
if dim == 2:
filename_in = "input/quantum/boron2d.py"
else:
assert_( dim == 3 )
filename_in = "input/quantum/boron3d.py"
options.dim = dim
print "Dimension:", dim
elif options.mesh:
try:
os.makedirs("tmp")
except OSError, e:
if e.errno != 17: # [Errno 17] File exists
raise
if options.dim2:
print "Dimension: 2"
os.system("cp database/quantum/square.geo tmp/mesh.geo")
os.system("gmsh -2 tmp/mesh.geo -format mesh")
os.system("script/mesh_to_vtk.py tmp/mesh.mesh tmp/mesh.vtk")
else:
print "Dimension: 3"
import geom
from sfepy.fem.mesh import Mesh
try:
from site_cfg import tetgen_path
except ImportError:
tetgen_path = '/usr/bin/tetgen'
os.system("gmsh -0 database/box.geo -o tmp/x.geo")
g = geom.read_gmsh("tmp/x.geo")
g.printinfo()
geom.write_tetgen(g, "tmp/t.poly")
geom.runtetgen("tmp/t.poly", a=0.03, Q=1.0, quadratic=False,
tetgenpath=tetgen_path)
m = Mesh.from_file("tmp/t.1.node")
m.write("tmp/mesh.vtk", io="auto")
print "Mesh written to tmp/mesh.vtk"
return
elif options.dft:
dim = MeshIO.any_from_filename("tmp/mesh.vtk").read_dimension()
if dim == 2:
filename_in = "input/quantum/dft2d.py"
else:
assert_( dim == 3 )
filename_in = "input/quantum/dft3d.py"
print "Dimension:", dim
options.dim = dim
else:
parser.print_help()
return
def gen_tiled_mesh(mesh, grid=None, scale=1.0, eps=1e-6, ret_ndmap=False):
"""
Generate a new mesh by repeating a given periodic element
along each axis.
Parameters
----------
mesh : Mesh instance
The input periodic FE mesh.
grid : array
Number of repetition along each axis.
scale : float, optional
Scaling factor.
eps : float, optional
Tolerance for boundary detection.
ret_ndmap : bool, optional
If True, return global node map.
Returns
-------
mesh_out : Mesh instance
FE mesh.
ndmap : array
Maps: actual node id --> node id in the reference cell.
"""
bbox = mesh.get_bounding_box()
if grid is None:
iscale = max(int(1.0 / scale), 1)
grid = [iscale] * mesh.dim
conns = mesh.conns[0]
for ii in mesh.conns[1:]:
conns = nm.vstack((conns, ii))
mat_ids = mesh.mat_ids[0]
for ii in mesh.mat_ids[1:]:
mat_ids = nm.hstack((mat_ids, ii))
coors = mesh.coors
ngrps = mesh.ngroups
nrep = nm.prod(grid)
ndmap = None
bar = MyBar(" repeating:")
bar.init(nrep)
nblk = 1
for ii, gr in enumerate(grid):
if ret_ndmap:
(conns, coors,
ngrps, ndmap0) = tiled_mesh1d(conns, coors, ngrps,
ii, gr, bbox.transpose()[ii],
eps=eps, mybar=(bar, nblk),
ndmap=ndmap)
ndmap = ndmap0
else:
conns, coors, ngrps = tiled_mesh1d(conns, coors, ngrps,
ii, gr, bbox.transpose()[ii],
eps=eps, mybar=(bar, nblk))
nblk *= gr
bar.update(nblk)
mat_ids = nm.tile(mat_ids, (nrep,))
mesh_out = Mesh.from_data('tiled mesh', coors * scale, ngrps,
[conns], [mat_ids], [mesh.descs[0]])
if ret_ndmap:
return mesh_out, ndmap
else:
return mesh_out
def gen_mesh_from_goem(geo, a=None, quadratic=False, verbose=True,
refine=False, polyfilename='./meshgen.poly',
out='mesh', **kwargs):
"""
Runs mesh generator - tetgen for 3D or triangle for 2D meshes.
Parameters
----------
geo : geometry
geometry description
a : int, optional
a maximum area/volume constraint
quadratic : bool, optional
set True for quadratic elements
verbose : bool, optional
detailed information
refine : bool, optional
refines mesh
Returns
-------
mesh : Mesh instance
triangular or tetrahedral mesh
"""
import os.path as op
import pexpect
# write geometry to poly file
geo.to_poly_file(polyfilename)
if not refine:
params = "-Apq"
else:
params = "-Arq"
if verbose:
params = params + " -Q"
if a != None and not refine:
params = params + " -a%f" % (a)
if refine:
params = params + " -a"
if quadratic:
params = params + " -o2"
params = params + " %s" % (polyfilename)
meshgen_call = {2: 'triangle', 3: 'tetgen'}
cmd = "%s %s" % (meshgen_call[geo.dim], params)
if verbose: print "Generating mesh using", cmd
if geo.dim == 2:
p=pexpect.run(cmd, timeout=None)
bname, ext = op.splitext(polyfilename)
mesh = Mesh.from_file(bname + '.1.node')
mesh.write(bname + '.' + out)
if geo.dim == 3:
p=pexpect.spawn(cmd, timeout=None)
if not refine:
p.expect("Opening %s." % (polyfilename))
else:
p.expect("Opening %s.node.\r\n" % (polyfilename))
p.expect("Opening %s.ele.\r\n" % (polyfilename))
p.expect("Opening %s.face.\r\n" % (polyfilename))
p.expect("Opening %s.vol." % (polyfilename))
assert p.before == ""
p.expect(pexpect.EOF)
if p.before != "\r\n":
print p.before
raise "Error when running mesh generator (see above for output): %s" % cmd
def gen_tiled_mesh(mesh, grid=None, scale=1.0, eps=1e-6, ret_ndmap=False):
"""
Generate a new mesh by repeating a given periodic element
along each axis.
Parameters
----------
mesh : Mesh instance
The input periodic FE mesh.
grid : array
Number of repetition along each axis.
scale : float, optional
Scaling factor.
eps : float, optional
Tolerance for boundary detection.
ret_ndmap : bool, optional
If True, return global node map.
Returns
-------
mesh_out : Mesh instance
FE mesh.
ndmap : array
Maps: actual node id --> node id in the reference cell.
"""
bbox = mesh.get_bounding_box()
if grid is None:
iscale = max(int(1.0 / scale), 1)
grid = [iscale] * mesh.dim
conns = mesh.conns[0]
for ii in mesh.conns[1:]:
conns = nm.vstack((conns, ii))
mat_ids = mesh.mat_ids[0]
for ii in mesh.mat_ids[1:]:
mat_ids = nm.hstack((mat_ids, ii))
coors = mesh.coors
ngrps = mesh.ngroups
nrep = nm.prod(grid)
ndmap = None
bar = MyBar(" repeating:")
bar.init(nrep)
nblk = 1
for ii, gr in enumerate(grid):
if ret_ndmap:
(conns, coors, ngrps, ndmap0) = tiled_mesh1d(conns,
coors,
ngrps,
ii,
gr,
bbox.transpose()[ii],
eps=eps,
mybar=(bar, nblk),
ndmap=ndmap)
ndmap = ndmap0
else:
conns, coors, ngrps = tiled_mesh1d(conns,
coors,
ngrps,
ii,
gr,
bbox.transpose()[ii],
eps=eps,
mybar=(bar, nblk))
nblk *= gr
bar.update(nblk)
mat_ids = nm.tile(mat_ids, (nrep, ))
mesh_out = Mesh.from_data('tiled mesh', coors * scale, ngrps, [conns],
[mat_ids], [mesh.descs[0]])
if ret_ndmap:
return mesh_out, ndmap
else:
return mesh_out
def gen_mesh_from_voxels(voxels, dims, etype='q'):
"""
Generate FE mesh from voxels (volumetric data).
Parameters
----------
voxels : array
Voxel matrix, 1=material.
dims : array
Size of one voxel.
etype : integer, optional
'q' - quadrilateral or hexahedral elements
't' - triangular or tetrahedral elements
Returns
-------
mesh : Mesh instance
Finite element mesh.
"""
dims = dims.squeeze()
dim = len(dims)
nddims = nm.array(voxels.shape) + 1
nodemtx = nm.zeros(nddims, dtype=nm.int32)
if dim == 2:
#iy, ix = nm.where(voxels.transpose())
iy, ix = nm.where(voxels)
nel = ix.shape[0]
if etype == 'q':
nodemtx[ix,iy] += 1
nodemtx[ix + 1,iy] += 1
nodemtx[ix + 1,iy + 1] += 1
nodemtx[ix,iy + 1] += 1
elif etype == 't':
nodemtx[ix,iy] += 2
nodemtx[ix + 1,iy] += 1
nodemtx[ix + 1,iy + 1] += 2
nodemtx[ix,iy + 1] += 1
nel *= 2
elif dim == 3:
#iy, ix, iz = nm.where(voxels.transpose(1, 0, 2))
iy, ix, iz = nm.where(voxels)
nel = ix.shape[0]
if etype == 'q':
nodemtx[ix,iy,iz] += 1
nodemtx[ix + 1,iy,iz] += 1
nodemtx[ix + 1,iy + 1,iz] += 1
nodemtx[ix,iy + 1,iz] += 1
nodemtx[ix,iy,iz + 1] += 1
nodemtx[ix + 1,iy,iz + 1] += 1
nodemtx[ix + 1,iy + 1,iz + 1] += 1
nodemtx[ix,iy + 1,iz + 1] += 1
elif etype == 't':
nodemtx[ix,iy,iz] += 6
nodemtx[ix + 1,iy,iz] += 2
nodemtx[ix + 1,iy + 1,iz] += 2
nodemtx[ix,iy + 1,iz] += 2
nodemtx[ix,iy,iz + 1] += 2
nodemtx[ix + 1,iy,iz + 1] += 2
nodemtx[ix + 1,iy + 1,iz + 1] += 6
nodemtx[ix,iy + 1,iz + 1] += 2
nel *= 6
else:
msg = 'incorrect voxel dimension! (%d)' % dim
raise ValueError(msg)
ndidx = nm.where(nodemtx)
coors = nm.array(ndidx).transpose() * dims
nnod = coors.shape[0]
nodeid = -nm.ones(nddims, dtype=nm.int32)
nodeid[ndidx] = nm.arange(nnod)
# generate elements
if dim == 2:
elems = nm.array([nodeid[ix,iy],
nodeid[ix + 1,iy],
nodeid[ix + 1,iy + 1],
nodeid[ix,iy + 1]]).transpose()
elif dim == 3:
elems = nm.array([nodeid[ix,iy,iz],
nodeid[ix + 1,iy,iz],
nodeid[ix + 1,iy + 1,iz],
nodeid[ix,iy + 1,iz],
nodeid[ix,iy,iz + 1],
nodeid[ix + 1,iy,iz + 1],
nodeid[ix + 1,iy + 1,iz + 1],
nodeid[ix,iy + 1,iz + 1]]).transpose()
if etype == 't':
elems = elems_q2t(elems)
eid = etype + str(dim)
eltab = {'q2': 4, 'q3': 8, 't2': 3, 't3': 4}
mesh = Mesh.from_data('voxel_data',
coors, nm.ones((nnod,), dtype=nm.int32),
{0: nm.ascontiguousarray(elems)},
{0: nm.ones((nel,), dtype=nm.int32)},
{0: '%d_%d' % (dim, eltab[eid])})
return mesh
def gen_mesh_from_voxels(voxels, dims, etype='q'):
"""
Generate FE mesh from voxels (volumetric data).
Parameters
----------
voxels : array
Voxel matrix, 1=material.
dims : array
Size of one voxel.
etype : integer, optional
'q' - quadrilateral or hexahedral elements
't' - triangular or tetrahedral elements
Returns
-------
mesh : Mesh instance
Finite element mesh.
"""
dims = dims.squeeze()
dim = len(dims)
nddims = nm.array(voxels.shape) + 2
nodemtx = nm.zeros(nddims, dtype=nm.int32)
if dim == 2:
#iy, ix = nm.where(voxels.transpose())
iy, ix = nm.where(voxels)
nel = ix.shape[0]
if etype == 'q':
nodemtx[ix, iy] += 1
nodemtx[ix + 1, iy] += 1
nodemtx[ix + 1, iy + 1] += 1
nodemtx[ix, iy + 1] += 1
elif etype == 't':
nodemtx[ix, iy] += 2
nodemtx[ix + 1, iy] += 1
nodemtx[ix + 1, iy + 1] += 2
nodemtx[ix, iy + 1] += 1
nel *= 2
elif dim == 3:
#iy, ix, iz = nm.where(voxels.transpose(1, 0, 2))
iy, ix, iz = nm.where(voxels)
nel = ix.shape[0]
if etype == 'q':
nodemtx[ix, iy, iz] += 1
nodemtx[ix + 1, iy, iz] += 1
nodemtx[ix + 1, iy + 1, iz] += 1
nodemtx[ix, iy + 1, iz] += 1
nodemtx[ix, iy, iz + 1] += 1
nodemtx[ix + 1, iy, iz + 1] += 1
nodemtx[ix + 1, iy + 1, iz + 1] += 1
nodemtx[ix, iy + 1, iz + 1] += 1
elif etype == 't':
nodemtx[ix, iy, iz] += 6
nodemtx[ix + 1, iy, iz] += 2
nodemtx[ix + 1, iy + 1, iz] += 2
nodemtx[ix, iy + 1, iz] += 2
nodemtx[ix, iy, iz + 1] += 2
nodemtx[ix + 1, iy, iz + 1] += 2
nodemtx[ix + 1, iy + 1, iz + 1] += 6
nodemtx[ix, iy + 1, iz + 1] += 2
nel *= 6
else:
msg = 'incorrect voxel dimension! (%d)' % dim
raise ValueError(msg)
ndidx = nm.where(nodemtx)
coors = nm.array(ndidx).transpose() * dims
nnod = coors.shape[0]
nodeid = -nm.ones(nddims, dtype=nm.int32)
nodeid[ndidx] = nm.arange(nnod)
# generate elements
if dim == 2:
elems = nm.array([
nodeid[ix, iy], nodeid[ix + 1, iy], nodeid[ix + 1, iy + 1],
nodeid[ix, iy + 1]
]).transpose()
elif dim == 3:
elems = nm.array([
nodeid[ix, iy, iz], nodeid[ix + 1, iy, iz], nodeid[ix + 1, iy + 1,
iz],
nodeid[ix, iy + 1, iz], nodeid[ix, iy, iz + 1], nodeid[ix + 1, iy,
iz + 1],
nodeid[ix + 1, iy + 1, iz + 1], nodeid[ix, iy + 1, iz + 1]
]).transpose()
if etype == 't':
elems = elems_q2t(elems)
eid = etype + str(dim)
eltab = {'q2': 4, 'q3': 8, 't2': 3, 't3': 4}
mesh = Mesh.from_data('voxel_data', coors, nm.ones(
(nnod, ), dtype=nm.int32), {0: nm.ascontiguousarray(elems)},
{0: nm.ones((nel, ), dtype=nm.int32)},
{0: '%d_%d' % (dim, eltab[eid])})
return mesh
def dump_to_vtk(filename,
output_filename_trunk=None,
step0=0,
steps=None,
fields=None,
linearization=None):
"""Dump a multi-time-step results file into a sequence of VTK files."""
def _save_step(suffix, out, mesh):
if linearization is not None:
output('linearizing...')
out = _linearize(out, fields, linearization)
output('...done')
for key, val in out.iteritems():
lmesh = val.get('mesh', mesh)
lmesh.write(output_filename_trunk + '_' + key + suffix,
io='auto',
out={key: val})
if hasattr(val, 'levels'):
output('max. refinement per group:', val.levels)
else:
mesh.write(output_filename_trunk + suffix, io='auto', out=out)
output('dumping to VTK...')
io = MeshIO.any_from_filename(filename)
mesh = Mesh.from_file(filename, io=io)
if output_filename_trunk is None:
output_filename_trunk = get_trunk(filename)
try:
ts = TimeStepper(*io.read_time_stepper())
all_steps, times, nts, dts = extract_times(filename)
except ValueError:
output('no time stepping info found, assuming single step')
out = io.read_data(0)
if out is not None:
_save_step('.vtk', out, mesh)
ret = None
else:
ts.times = times
ts.n_step = times.shape[0]
if steps is None:
ii0 = nm.searchsorted(all_steps, step0)
iterator = ((all_steps[ii], times[ii])
for ii in xrange(ii0, len(times)))
else:
iterator = [(step, ts.times[step]) for step in steps]
max_step = all_steps.max()
for step, time in iterator:
output(ts.format % (step, max_step))
out = io.read_data(step)
if out is None: break
_save_step('.' + ts.suffix % step + '.vtk', out, mesh)
ret = ts.suffix
output('...done')
return ret
def gen_cylinder_mesh(dims,
shape,
centre,
axis='x',
force_hollow=False,
is_open=False,
open_angle=0.0,
non_uniform=False,
name='cylinder',
verbose=True):
"""
Generate a cylindrical mesh along an axis. Its cross-section can be
ellipsoidal.
Parameters
----------
dims : array of 5 floats
Dimensions of the cylinder: inner surface semi-axes a1, b1, outer
surface semi-axes a2, b2, length.
shape : array of 3 ints
Shape (counts of nodes in radial, circumferential and longitudinal
directions) of the cylinder mesh.
centre : array of 3 floats
Centre of the cylinder.
axis: one of 'x', 'y', 'z'
The axis of the cylinder.
force_hollow : boolean
Force hollow mesh even if inner radii a1 = b1 = 0.
is_open : boolean
Generate an open cylinder segment.
open_angle : float
Opening angle in radians.
non_uniform : boolean
If True, space the mesh nodes in radial direction so that the element
volumes are (approximately) the same, making thus the elements towards
the outer surface thinner.
name : string
Mesh name.
verbose : bool
If True, show progress of the mesh generation.
Returns
-------
mesh : Mesh instance
"""
dims = nm.asarray(dims, dtype=nm.float64)
shape = nm.asarray(shape, dtype=nm.int32)
centre = nm.asarray(centre, dtype=nm.float64)
a1, b1, a2, b2, length = dims
nr, nfi, nl = shape
origin = centre - nm.array([0.5 * length, 0.0, 0.0])
dfi = 2.0 * (nm.pi - open_angle) / nfi
if is_open:
nnfi = nfi + 1
else:
nnfi = nfi
is_hollow = force_hollow or not (max(abs(a1), abs(b1)) < 1e-15)
if is_hollow:
mr = 0
else:
mr = (nnfi - 1) * nl
grid = nm.zeros((nr, nnfi, nl), dtype=nm.int32)
n_nod = nr * nnfi * nl - mr
coors = nm.zeros((n_nod, 3), dtype=nm.float64)
angles = nm.linspace(open_angle, open_angle + (nfi) * dfi, nfi + 1)
xs = nm.linspace(0.0, length, nl)
if non_uniform:
ras = nm.zeros((nr, ), dtype=nm.float64)
rbs = nm.zeros_like(ras)
advol = (a2**2 - a1**2) / (nr - 1)
bdvol = (b2**2 - b1**2) / (nr - 1)
ras[0], rbs[0] = a1, b1
for ii in range(1, nr):
ras[ii] = nm.sqrt(advol + ras[ii - 1]**2)
rbs[ii] = nm.sqrt(bdvol + rbs[ii - 1]**2)
else:
ras = nm.linspace(a1, a2, nr)
rbs = nm.linspace(b1, b2, nr)
# This is 3D only...
bar = MyBar(" nodes:", verbose=verbose)
bar.init(n_nod)
ii = 0
for ix in range(nr):
a, b = ras[ix], rbs[ix]
for iy, fi in enumerate(angles[:nnfi]):
for iz, x in enumerate(xs):
grid[ix, iy, iz] = ii
coors[ii] = origin + [x, a * nm.cos(fi), b * nm.sin(fi)]
if not (ii % 100):
bar.update(ii)
ii += 1
if not is_hollow and (ix == 0):
if iy > 0:
grid[ix, iy, iz] = grid[ix, 0, iz]
ii -= 1
assert_(ii == n_nod)
n_el = (nr - 1) * nnfi * (nl - 1)
conn = nm.zeros((n_el, 8), dtype=nm.int32)
bar = MyBar(" elements:", verbose=verbose)
bar.init(n_el)
ii = 0
for (ix, iy, iz) in cycle([nr - 1, nnfi, nl - 1]):
if iy < (nnfi - 1):
conn[ii, :] = [
grid[ix, iy, iz], grid[ix + 1, iy, iz], grid[ix + 1, iy + 1,
iz],
grid[ix, iy + 1, iz], grid[ix, iy, iz + 1], grid[ix + 1, iy,
iz + 1],
grid[ix + 1, iy + 1, iz + 1], grid[ix, iy + 1, iz + 1]
]
ii += 1
elif not is_open:
conn[ii, :] = [
grid[ix, iy, iz], grid[ix + 1, iy, iz], grid[ix + 1, 0, iz],
grid[ix, 0, iz], grid[ix, iy, iz + 1],
grid[ix + 1, iy, iz + 1], grid[ix + 1, 0, iz + 1], grid[ix, 0,
iz + 1]
]
ii += 1
if not (ii % 100):
bar.update(ii)
mat_id = nm.zeros((n_el, ), dtype=nm.int32)
desc = '3_8'
assert_(n_nod == (conn.max() + 1))
if axis == 'z':
coors = coors[:, [1, 2, 0]]
elif axis == 'y':
coors = coors[:, [2, 0, 1]]
mesh = Mesh.from_data(name, coors, None, [conn], [mat_id], [desc])
return mesh
def solve_eigen_problem1( conf, options ):
pb = ProblemDefinition.from_conf( conf )
dim = pb.domain.mesh.dim
pb.time_update()
dummy = pb.create_state_vector()
output( 'assembling lhs...' )
tt = time.clock()
mtx_a = eval_term_op( dummy, conf.equations['lhs'], pb,
dw_mode = 'matrix', tangent_matrix = pb.mtx_a )
output( '...done in %.2f s' % (time.clock() - tt) )
output( 'assembling rhs...' )
tt = time.clock()
mtx_b = eval_term_op( dummy, conf.equations['rhs'], pb,
dw_mode = 'matrix', tangent_matrix = pb.mtx_a.copy() )
output( '...done in %.2f s' % (time.clock() - tt) )
#mtxA.save( 'tmp/a.txt', format='%d %d %.12f\n' )
#mtxB.save( 'tmp/b.txt', format='%d %d %.12f\n' )
try:
n_eigs = conf.options.n_eigs
except AttributeError:
n_eigs = mtx_a.shape[0]
if n_eigs is None:
n_eigs = mtx_a.shape[0]
## mtx_a.save( 'a.txt', format='%d %d %.12f\n' )
## mtx_b.save( 'b.txt', format='%d %d %.12f\n' )
print 'computing resonance frequencies...'
eig = Solver.any_from_conf( pb.get_solver_conf( conf.options.eigen_solver ) )
eigs, mtx_s_phi = eig( mtx_a, mtx_b, conf.options.n_eigs )
from sfepy.fem.mesh import Mesh
bounding_box = Mesh.from_file("tmp/mesh.vtk").get_bounding_box()
# this assumes a box (3D), or a square (2D):
a = bounding_box[1][0] - bounding_box[0][0]
E_exact = None
if options.hydrogen or options.boron:
if options.hydrogen:
Z = 1
elif options.boron:
Z = 5
if options.dim == 2:
E_exact = [-float(Z)**2/2/(n-0.5)**2/4 for n in [1]+[2]*3+[3]*5 +\
[4]*8 + [5]*15]
elif options.dim == 3:
E_exact = [-float(Z)**2/2/n**2 for n in [1]+[2]*2**2+[3]*3**2 ]
if options.well:
if options.dim == 2:
E_exact = [pi**2/(2*a**2)*x for x in [2, 5, 5, 8, 10, 10, 13, 13,
17, 17, 18, 20, 20 ] ]
elif options.dim == 3:
E_exact = [pi**2/(2*a**2)*x for x in [3, 6, 6, 6, 9, 9, 9, 11, 11,
11, 12, 14, 14, 14, 14, 14, 14, 17, 17, 17] ]
if options.oscillator:
if options.dim == 2:
E_exact = [1] + [2]*2 + [3]*3 + [4]*4 + [5]*5 + [6]*6
elif options.dim == 3:
E_exact = [float(1)/2+x for x in [1]+[2]*3+[3]*6+[4]*10 ]
if E_exact is not None:
print "a=%f" % a
print "Energies:"
print "n exact FEM error"
for i, e in enumerate(eigs):
from numpy import NaN
if i < len(E_exact):
exact = E_exact[i]
err = 100*abs((exact - e)/exact)
else:
exact = NaN
err = NaN
print "%d: %.8f %.8f %5.2f%%" % (i, exact, e, err)
else:
print eigs
## import sfepy.base.plotutils as plu
## plu.spy( mtx_b, eps = 1e-12 )
## plu.pylab.show()
## pause()
n_eigs = eigs.shape[0]
mtx_phi = nm.empty( (pb.variables.di.ptr[-1], mtx_s_phi.shape[1]),
dtype = nm.float64 )
for ii in xrange( n_eigs ):
mtx_phi[:,ii] = pb.variables.make_full_vec( mtx_s_phi[:,ii] )
save = get_default_attr( conf.options, 'save_eig_vectors', None )
out = {}
for ii in xrange( n_eigs ):
if save is not None:
if (ii > save[0]) and (ii < (n_eigs - save[1])): continue
aux = pb.state_to_output( mtx_phi[:,ii] )
key = aux.keys()[0]
out[key+'%03d' % ii] = aux[key]
ofn_trunk = options.output_filename_trunk
pb.domain.mesh.write( ofn_trunk + '.vtk', io = 'auto', out = out )
fd = open( ofn_trunk + '_eigs.txt', 'w' )
eigs.tofile( fd, ' ' )
fd.close()
return Struct( pb = pb, eigs = eigs, mtx_phi = mtx_phi )