class TestCyclicResultReader(object):
# avoids errors in collection
result_file = os.path.join(data_path, 'cyclic_%s.rst' % rver)
try:
# test if raw results are being read properly by using the normal result reader
result = ResultFile(result_file, ignore_cyclic=True)
if rver == 'v182':
ansys = pyansys.ANSYS('/usr/ansys_inc/v182/ansys/bin/ansys182',
override=True, jobname=rver,
loglevel='DEBUG',
interactive_plotting=False,
prefer_pexpect=True)
else:
ansys = pyansys.ANSYS('/usr/ansys_inc/v150/ansys/bin/ansys150',
override=True, jobname=rver,
loglevel='DEBUG',
interactive_plotting=False,
prefer_pexpect=True)
# copy result file to ansys's temporary path
copyfile(result_file, os.path.join(ansys.path, '%s.rst' % rver))
# setup ansys for output without line breaks
ansys.Post1()
ansys.Set(1, 1)
ansys.Header('OFF', 'OFF', 'OFF', 'OFF', 'OFF', 'OFF')
nsigfig = 10
ansys.Format('', 'E', nsigfig + 9, nsigfig)
ansys.Page(1E9, '', -1, 240)
except: # for travis and appveyor
pass
def test_prnsol_u(self):
# verify cyclic displacements
table = self.ansys.Prnsol('u').splitlines()
if self.ansys.using_corba:
array = np.genfromtxt(table[7:])
else:
array = np.genfromtxt(table[9:])
ansys_nnum = array[:, 0].astype(np.int)
ansys_disp = array[:, 1:-1]
nnum, disp = self.result.nodal_solution(0)
# cyclic model will only output the master sector
ansys_nnum = ansys_nnum[:nnum.size]
ansys_disp = ansys_disp[:nnum.size]
assert np.allclose(ansys_nnum, nnum)
assert np.allclose(ansys_disp, disp)
def test_presol_s(self):
# verify element stress
element_stress, _, enode = self.result.element_stress(0)
element_stress = np.vstack(element_stress)
enode = np.hstack(enode)
# parse ansys result
table = self.ansys.Presol('S').splitlines()
ansys_element_stress = []
line_length = len(table[15])
for line in table:
if len(line) == line_length:
ansys_element_stress.append(line)
ansys_element_stress = np.genfromtxt(ansys_element_stress)
ansys_enode = ansys_element_stress[:, 0].astype(np.int)
ansys_element_stress = ansys_element_stress[:, 1:]
assert np.allclose(element_stress, ansys_element_stress)
assert np.allclose(enode, ansys_enode)
def test_prnsol_s(self):
# verify cyclic displacements
table = self.ansys.Prnsol('s').splitlines()
if self.ansys.using_corba:
array = np.genfromtxt(table[7:])
else:
array = np.genfromtxt(table[10:])
ansys_nnum = array[:, 0].astype(np.int)
ansys_stress = array[:, 1:]
nnum, stress = self.result.nodal_stress(0)
# v150 includes nodes in the geometry that aren't in the result
mask = np.in1d(nnum, ansys_nnum)
nnum = nnum[mask]
stress = stress[mask]
assert np.allclose(ansys_nnum, nnum)
assert np.allclose(ansys_stress, stress)
def test_prnsol_prin(self):
# verify principal stress
table = self.ansys.Prnsol('prin').splitlines()
if self.ansys.using_corba:
array = np.genfromtxt(table[7:])
else:
array = np.genfromtxt(table[10:])
ansys_nnum = array[:, 0].astype(np.int)
ansys_stress = array[:, 1:]
nnum, stress = self.result.principal_nodal_stress(0)
# v150 includes nodes in the geometry that aren't in the result
mask = np.in1d(nnum, ansys_nnum)
nnum = nnum[mask]
stress = stress[mask]
assert np.allclose(ansys_nnum, nnum)
assert np.allclose(ansys_stress, stress, atol=1E-2)
@pytest.mark.skipif(not system_supports_plotting(), reason="Requires active X Server")
def test_plot(self):
filename = '/tmp/temp.png'
self.result.plot_nodal_solution(0, screenshot=filename,
off_screen=True)
# self.result.plot_nodal_stress(0, 'Sx', screenshot=filename,
# off_screen=True)
self.result.plot_principal_nodal_stress(0, 'EQV', screenshot=filename,
off_screen=True)
def test_exit(self):
self.ansys.Exit()
"""
This script was used to generate the sector modal analysis result file.
Result file is sector.rst
"""
import pyansys
from pyansys import examples
ansys = pyansys.ANSYS()
ansys.Cdread('db', examples.sector_archive_file)
# make cyclic
ansys('/PREP7')
ansys('CYCLIC')
# Steel
ansys('MP, NUXY, 1, 0.3')
ansys('MP, DENS, 1, 0.0005')
ansys('MP, EX, 1, 17000000')
ansys('EMODIF,ALL,MAT,1')
# Static solution
ansys('/SOLU')
ansys('ANTYPE, 2, new')
ansys('MODOPT, LANB, 6, 1')
ansys.Cycopt('hindex', 'all')
ansys.Bcsoption('', 'INCORE')
ansys.Mxpand('', '', '', 'Yes')
ansys.Solve()
ansys.Finish()
def ansys_cylinder_demo(exec_file=None, plot_vtk=True,
plot_ansys=True, as_test=False):
"""
Cylinder demo for ansys
"""
# cylinder parameters
# torque = 100
radius = 2
h_tip = 2
height = 20
elemsize = 0.5
force = 100/radius
pressure = force/(h_tip*2*np.pi*radius)
# start ANSYS
if as_test:
loglevel = 'ERROR'
else:
loglevel = 'INFO'
ansys = pyansys.ANSYS(exec_file=exec_file, override=True, loglevel=loglevel)
# Define higher-order SOLID186
# Define surface effect elements SURF154 to apply torque
# as a tangential pressure
ansys.Prep7()
ansys.Et(1, 186)
ansys.Et(2, 154)
ansys.R(1)
ansys.R(2)
# Aluminum properties (or something)
ansys.Mp('ex', 1, 10e6)
ansys.Mp('nuxy', 1, 0.3)
ansys.Mp('dens', 1, 0.1/386.1)
ansys.Mp('dens', 2, 0)
# Simple cylinder
for i in range(4):
ansys.Cylind(radius, '', '', height, 90*(i-1), 90*i)
ansys.Nummrg('kp')
# non-interactive volume plot
if plot_ansys and not as_test:
ansys.View(1, 1, 1, 1)
ansys.Vplot()
# mesh cylinder
ansys.Lsel('s', 'loc', 'x', 0)
ansys.Lsel('r', 'loc', 'y', 0)
ansys.Lsel('r', 'loc', 'z', 0, height - h_tip)
ansys.Lesize('all', elemsize*2)
ansys.Mshape(0)
ansys.Mshkey(1)
ansys.Esize(elemsize)
ansys.Allsel('all')
ansys.Vsweep('ALL')
ansys.Csys(1)
ansys.Asel('s', 'loc', 'z', '', height - h_tip + 0.0001)
ansys.Asel('r', 'loc', 'x', radius)
ansys.Local(11, 1)
ansys.Csys(0)
ansys.Aatt(2, 2, 2, 11)
ansys.Amesh('all')
ansys.Finish()
if plot_ansys and not as_test:
ansys.Eplot()
# new solution
ansys.Slashsolu()
ansys.Antype('static', 'new')
ansys.Eqslv('pcg', 1e-8)
# Apply tangential pressure
ansys.Esel('s', 'type', '', 2)
ansys.Sfe('all', 2, 'pres', '', pressure)
# Constrain bottom of cylinder/rod
ansys.Asel('s', 'loc', 'z', 0)
ansys.Nsla('s', 1)
ansys.D('all', 'all')
ansys.Allsel()
ansys.Psf('pres', '', 2)
ansys.Pbc('u', 1)
ansys.Solve()
ansys.Finish()
ansys.Exit()
# open the result file
result = ansys.result
element_stress, elemnum, enode = result.element_stress(0)
if as_test:
assert len(element_stress)
else:
print(element_stress[:10])
nodenum, stress = result.nodal_stress(0)
if as_test:
assert np.any(stress)
else:
print(stress[:10])
cpos = [(20.992831318277517, 9.78629316586435, 31.905115108541928),
(0.35955395443745797, -1.4198191001571547, 10.346158032932495),
(-0.10547549888485548, 0.9200673323892437, -0.377294345312956)]
if plot_vtk:
result.plot_nodal_solution(0, cpos=cpos, cmap='bwr',
off_screen=as_test, screenshot=as_test)
result.plot_nodal_stress(0, 'x', cpos=cpos, cmap='bwr',
off_screen=as_test, screenshot=as_test)
result.plot_principal_nodal_stress(0, 'EQV', cpos=cpos,
cmap='bwr', off_screen=as_test, screenshot=as_test)
return True
def CylinderANSYS(plot_vtk=True, plot_ansys=True):
# cylinder parameters
# torque = 100
radius = 2
h_tip = 2
height = 20
elemsize = 0.5
# pi = np.arccos(-1)
force = 100 / radius
pressure = force / (h_tip * 2 * np.pi * radius)
# start ANSYS
# pyansys.OpenLogger()
ansys = pyansys.ANSYS(override=True)
# Define higher-order SOLID186
# Define surface effect elements SURF154 to apply torque
# as a tangential pressure
ansys.Prep7()
ansys.Et(1, 186)
ansys.Et(2, 154)
ansys.R(1)
ansys.R(2)
# Aluminum properties (or something)
ansys.Mp('ex', 1, 10e6)
ansys.Mp('nuxy', 1, 0.3)
ansys.Mp('dens', 1, 0.1 / 386.1)
ansys.Mp('dens', 2, 0)
# Simple cylinder
for i in range(4):
ansys.Cylind(radius, '', '', height, 90 * (i - 1), 90 * i)
ansys.Nummrg('kp')
# non-interactive volume plot
if plot_ansys:
ansys.Show()
ansys.Menu('grph')
ansys.View(1, 1, 1, 1)
ansys.Vplot()
ansys.Wait(1)
# mesh cylinder
ansys.Lsel('s', 'loc', 'x', 0)
ansys.Lsel('r', 'loc', 'y', 0)
ansys.Lsel('r', 'loc', 'z', 0, height - h_tip)
ansys.Lesize('all', elemsize * 2)
ansys.Mshape(0)
ansys.Mshkey(1)
ansys.Esize(elemsize)
ansys.Allsel('all')
ansys.Vsweep('ALL')
ansys.Csys(1)
ansys.Asel('s', 'loc', 'z', '', height - h_tip + 0.0001)
ansys.Asel('r', 'loc', 'x', radius)
ansys.Local(11, 1)
ansys.Csys(0)
ansys.Aatt(2, 2, 2, 11)
ansys.Amesh('all')
ansys.Finish()
if plot_ansys:
ansys.Eplot()
ansys.Wait(1)
# new solution
ansys.Slashsolu()
ansys.Antype('static', 'new')
ansys.Eqslv('pcg', 1e-8)
# Apply tangential pressure
ansys.Esel('s', 'type', '', 2)
ansys.Sfe('all', 2, 'pres', '', pressure)
# Constrain bottom of cylinder/rod
ansys.Asel('s', 'loc', 'z', 0)
ansys.Nsla('s', 1)
ansys.D('all', 'all')
ansys.Allsel()
ansys.Psf('pres', '', 2)
ansys.Pbc('u', 1)
ansys.Solve()
ansys.Finish()
# ansys.Save()
ansys.Exit()
# open the result file
path = ansys.path
resultfile = os.path.join(path, 'file.rst')
result = pyansys.ResultReader(resultfile)
element_stress, elemnum, enode = result.ElementStress(0)
print(element_stress)
nodenum, stress = result.NodalStress(0)
print(stress)
if plot_vtk:
# # plot interactively
result.PlotNodalSolution(0, colormap='bwr')
result.PlotNodalStress(0, 'Sx', colormap='bwr')
result.PlotPrincipalNodalStress(0, 'SEQV', colormap='bwr')
# plot and save non-interactively
cpos = [(20.992831318277517, 9.78629316586435, 31.905115108541928),
(0.35955395443745797, -1.4198191001571547, 10.346158032932495),
(-0.10547549888485548, 0.9200673323892437, -0.377294345312956)]
result.PlotNodalSolution(0,
interactive=False,
cpos=cpos,
screenshot=os.path.join(
path, 'cylinder_disp.png'))
result.PlotNodalStress(0,
'Sx',
colormap='bwr',
interactive=False,
cpos=cpos,
screenshot=os.path.join(path,
'cylinder_sx.png'))
result.PlotPrincipalNodalStress(0,
'SEQV',
colormap='bwr',
interactive=False,
cpos=cpos,
screenshot=os.path.join(
path, 'cylinder_vonmises.png'))