def _update_ctx(self, ctx):
ctx['gravity'] = self.gravity
ctx['bc_wall'] = 'fullbb'
ctx['bc_velocity'] = None
ctx['bc_pressure'] = None
ctx['bc_wall_'] = geo.get_bc('fullbb')
ctx['bc_velocity_'] = geo.get_bc('fullbb')
ctx['bc_pressure_'] = geo.get_bc('fullbb')
def define_nodes(self):
radiussq = ((self.chan_diam) / 2)**2
diam = sphere_diam(self.width, geo.get_bc(self.options.bc_velocity))
x0 = int(2.4 * diam)
y0 = (self.lat_ny - 1) / 2.0
z0 = (self.lat_nz - 1) / 2.0
h = 0.0
bc = geo.get_bc(self.options.bc_velocity)
h = -bc.location
z0 -= bc.location
y0 -= bc.location
hz, hy, hx = np.mgrid[0:self.lat_nz, 0:self.lat_ny, 0:self.lat_nx]
# Channel walls.
node_map = (y0 - (hy + h))**2 + (z0 - (hz + h))**2 >= radiussq
self.set_geo(node_map, self.NODE_VELOCITY, (self.maxv, 0.0, 0.0))
# Inlet.
self.set_geo(hx == 0, self.NODE_VELOCITY, (self.maxv, 0.0, 0.0))
ix0 = int(x0)
iy0 = int(y0)
iz0 = int(z0)
rsq = diam**2 / 4.0
miny = iy0
maxy = iy0
radius = int(diam / 2)
wall_map = (x0 - (hx + h))**2 + (y0 -
(hy + h))**2 + (z0 -
(hz + h))**2 <= rsq
self.set_geo(wall_map, self.NODE_WALL)
maxy = np.max(hy[wall_map])
miny = np.min(hy[wall_map])
bc = geo.get_bc(self.options.bc_wall)
self.sphere_diam = float(maxy - miny) + 2.0 * bc.location
diam = int(diam)
self.add_force_object(
'sphere',
(ix0 - diam / 2 - 3, iy0 - diam / 2 - 3, iz0 - diam / 2 - 3),
(diam + 6, diam + 6, diam + 6))
def _velocity_profile(self, hi):
bc = geo.get_bc(self.options.bc_wall)
width = self.get_chan_width()
lat_width = self.get_width()
h = -bc.location
return (4.0 * self.maxv/width**2 * (hi + h) * (width - hi - h))
def define_nodes(self):
radiussq = ((self.chan_diam)/2)**2
diam = sphere_diam(self.width, geo.get_bc(self.options.bc_velocity))
x0 = int(2.4*diam)
y0 = (self.lat_ny - 1) / 2.0
z0 = (self.lat_nz - 1) / 2.0
h = 0.0
bc = geo.get_bc(self.options.bc_velocity)
h = -bc.location
z0 -= bc.location
y0 -= bc.location
hz, hy, hx = np.mgrid[0:self.lat_nz, 0:self.lat_ny, 0:self.lat_nx]
# Channel walls.
node_map = (y0 - (hy + h))**2 + (z0 - (hz + h))**2 >= radiussq
self.set_geo(node_map, self.NODE_VELOCITY, (self.maxv, 0.0, 0.0))
# Inlet.
self.set_geo(hx == 0, self.NODE_VELOCITY, (self.maxv, 0.0, 0.0))
ix0 = int(x0)
iy0 = int(y0)
iz0 = int(z0)
rsq = diam**2 / 4.0
miny = iy0
maxy = iy0
radius = int(diam / 2)
wall_map = (x0 - (hx+h))**2 + (y0 - (hy+h))**2 + (z0 - (hz+h))**2 <= rsq
self.set_geo(wall_map, self.NODE_WALL)
maxy = np.max(hy[wall_map])
miny = np.min(hy[wall_map])
bc = geo.get_bc(self.options.bc_wall)
self.sphere_diam = float(maxy - miny) + 2.0 * bc.location
diam = int(diam)
self.add_force_object('sphere', (ix0-diam/2-3, iy0-diam/2-3, iz0-diam/2-3),
(diam+6, diam+6, diam+6))
def get_profile(self):
# NOTE: This only works for the 'along_y' option.
if geo.get_bc(self.options.bc_wall).wet_nodes:
return self.vy[:,
int(self.options.lat_ny / 2),
int(self.options.lat_nx / 2)]
else:
return self.vy[1:-1,
int(self.options.lat_ny / 2),
int(self.options.lat_nx / 2)]
def get_profile(self):
if geo.get_bc(self.options.bc_wall).wet_nodes:
if self.options.horizontal:
return self.vx[:,int(self.options.lat_nx/2)]
else:
return self.vy[int(self.options.lat_ny/2),:]
else:
if self.options.horizontal:
return self.vx[1:-1,int(self.options.lat_nx/2)]
else:
return self.vy[int(self.options.lat_ny/2),1:-1]
def __init__(self, geo_class, defaults={}, args=sys.argv[1:]):
opts = []
opts.append(optparse.make_option('--re', dest='re', type='int', help='Reynolds number', default=100))
defaults_ = {'lat_nz': 128,
'lat_ny': 128,
'lat_nx': 512,
'max_iters': 320000,
'model': 'mrt',
'every': 100,
'incompressible': True,
'grid': 'D3Q13',
'bc_velocity': 'fullbb',
'verbose': True}
defaults_.update(defaults)
lb_single.FluidLBMSim.__init__(self, geo_class, options=opts, args=args, defaults=defaults_)
if self.options.batch and not ('every' in self.options.specified):
self.options.every = 1000
diam = sphere_diam(self.options.lat_ny, geo.get_bc(self.options.bc_velocity))
# If the diameter here is odd, the channel width is even and we will end up
# with a sphere of an even diameter so that the system can be symmetric.
if diam % 2:
diam -= 1.0
# maxv / visc
ratio = self.options.re / diam
visc = 0.12
maxv = ratio * visc
# Try to keep the viscosity as high as possible to make sure the computed force
# is correct. For single precision calculations, flows with low viscosity and
# low flow speed can yield incorrect values. There are no such problems for
# double precision simulations.
if maxv > 0.1:
geo_class.maxv = 0.1
self.options.visc = geo_class.maxv / ratio
else:
geo_class.maxv = maxv
self.options.visc = visc
if self.options.verbose:
self._timed_print('# maxv = %s' % geo_class.maxv)
self.add_iter_hook(self.options.every, self.print_force, every=True)
if self.options.verbose:
self.add_iter_hook(5, self.print_theoretical_drag)
self.coeffs = []
def _update_ctx(self, ctx):
ctx['incompressible'] = self.incompressible
ctx['bc_wall'] = self.options.bc_wall
ctx['bc_slip'] = self.options.bc_slip
if self.geo.has_velocity_nodes:
ctx['bc_velocity'] = self.options.bc_velocity
else:
ctx['bc_velocity'] = None
if self.geo.has_pressure_nodes:
ctx['bc_pressure'] = self.options.bc_pressure
else:
ctx['bc_pressure'] = None
ctx['bc_wall_'] = geo.get_bc(self.options.bc_wall)
ctx['bc_slip_'] = geo.get_bc(self.options.bc_slip)
ctx['bc_velocity_'] = geo.get_bc(self.options.bc_velocity)
ctx['bc_pressure_'] = geo.get_bc(self.options.bc_pressure)
ctx['simtype'] = 'fluid'
ctx['subgrid'] = self.options.subgrid
ctx['smagorinsky_const'] = self.options.smagorinsky_const
def get_velocity_profile(self, fluid_only=False):
bc = geo.get_bc(self.options.bc_wall)
x = self.lat_nx/2
if fluid_only and not bc.wet_nodes:
zvals = range(1, self.lat_nz-1)
else:
zvals = range(0, self.lat_nz)
ret = []
for z in zvals:
rc = math.sqrt((x-self.lat_nx/2.0+0.5)**2 + (z-self.lat_nz/2.0+0.5)**2)
ret.append(self.get_velocity(rc))
return ret
def get_velocity_profile(self, fluid_only=False):
bc = geo.get_bc(self.options.bc_wall)
width = self.get_chan_width()
lat_width = self.get_width()
ret = []
h = -bc.location
for x in range(0, lat_width):
tx = x+h
ret.append(4.0*self.maxv/width**2 * tx * (width-tx))
# Remove data corresponding to non-fluid nodes if necessary.
if fluid_only and not bc.wet_nodes:
return ret[1:-1]
return ret
def get_velocity_profile(self, fluid_only=False):
bc = geo.get_bc(self.options.bc_wall)
x = self.lat_nx / 2
if fluid_only and not bc.wet_nodes:
zvals = range(1, self.lat_nz - 1)
else:
zvals = range(0, self.lat_nz)
ret = []
for z in zvals:
rc = math.sqrt((x - self.lat_nx / 2.0 + 0.5)**2 +
(z - self.lat_nz / 2.0 + 0.5)**2)
ret.append(self.get_velocity(rc))
return ret
def get_profile(self):
# NOTE: This only works for the 'along_y' option.
if geo.get_bc(self.options.bc_wall).wet_nodes:
return self.vy[:,int(self.options.lat_ny/2),int(self.options.lat_nx/2)]
else:
return self.vy[1:-1,int(self.options.lat_ny/2),int(self.options.lat_nx/2)]
def get_chan_width(self):
bc = geo.get_bc(self.options.bc_wall)
return self.get_width() - 1 - 2 * bc.location
def chan_diam(self):
"""The actual channel diameter in lattice units."""
bc = geo.get_bc(self.options.bc_velocity)
return self.width - 1 - 2.0 * bc.location
def __init__(self, geo_class, defaults={}, args=sys.argv[1:]):
opts = []
opts.append(
optparse.make_option('--re',
dest='re',
type='int',
help='Reynolds number',
default=100))
defaults_ = {
'lat_nz': 128,
'lat_ny': 128,
'lat_nx': 512,
'max_iters': 320000,
'model': 'mrt',
'every': 100,
'incompressible': True,
'grid': 'D3Q13',
'bc_velocity': 'fullbb',
'verbose': True
}
defaults_.update(defaults)
lb_single.FluidLBMSim.__init__(self,
geo_class,
options=opts,
args=args,
defaults=defaults_)
if self.options.batch and not ('every' in self.options.specified):
self.options.every = 1000
diam = sphere_diam(self.options.lat_ny,
geo.get_bc(self.options.bc_velocity))
# If the diameter here is odd, the channel width is even and we will end up
# with a sphere of an even diameter so that the system can be symmetric.
if diam % 2:
diam -= 1.0
# maxv / visc
ratio = self.options.re / diam
visc = 0.12
maxv = ratio * visc
# Try to keep the viscosity as high as possible to make sure the computed force
# is correct. For single precision calculations, flows with low viscosity and
# low flow speed can yield incorrect values. There are no such problems for
# double precision simulations.
if maxv > 0.1:
geo_class.maxv = 0.1
self.options.visc = geo_class.maxv / ratio
else:
geo_class.maxv = maxv
self.options.visc = visc
if self.options.verbose:
self._timed_print('# maxv = %s' % geo_class.maxv)
self.add_iter_hook(self.options.every, self.print_force, every=True)
if self.options.verbose:
self.add_iter_hook(5, self.print_theoretical_drag)
self.coeffs = []
def chan_diam(self):
"""The actual channel diameter in lattice units."""
bc = geo.get_bc(self.options.bc_velocity)
return self.width - 1 - 2.0 * bc.location
def get_chan_width(self):
bc = geo.get_bc(self.options.bc_wall)
return self.get_width() - 1 - 2 * bc.location
if options.grid:
grid = options.grid
else:
if options.dim == "2":
grid = "D2Q9"
else:
grid = "D3Q13"
if options.drive == "force":
geo_type = geo.LBMGeo.NODE_WALL
else:
geo_type = geo.LBMGeo.NODE_PRESSURE
if options.bc:
bcs = filter(lambda x: geo_type in geo.get_bc(x).supported_types, options.bc.split(","))
else:
bcs = [x.name for x in geo.SUPPORTED_BCS if geo_type in x.supported_types]
class LTestPoiSim(LPoiSim):
def __init__(self, args, defaults):
super(LTestPoiSim, self).__init__(LBMGeoPoiseuille, args, defaults)
self.clear_hooks()
self.add_iter_hook(self.options.max_iters - 1, self.save_output)
def save_output(self):
# self.result = (numpy.max(self.vy[16,1:self.geo.lat_nx-1]) / max(self.geo.get_velocity_profile())) - 1.0
self.res_maxv = numpy.max(self.geo.mask_array_by_fluid(self.vy))
self.th_maxv = max(self.geo.get_velocity_profile())