def test_quad_180_01(self):
r"""
Identify a 180+ degree quad
y
^ 4
| / |
| / |
| / |
| / |
/ |
1------2 |----> x
\ |
\|
3
"""
msg = ('CEND\n'
'BEGIN BULK\n'
'GRID,1,,0.,0.,0.\n'
'GRID,2,,1.,0.,0.\n'
'GRID,3,,2.,-1.,0.\n'
'GRID,4,,2., 1.,0.\n'
'CQUAD4,100,1, 1,2,3,4\n'
'PSHELL,1,1,0.1\n'
'MAT1,1,3.0,, 0.3\n'
'ENDDATA')
bdf_filename = 'cquad4.bdf'
with codec_open(bdf_filename, 'w') as bdf_file:
bdf_file.write(msg)
model = read_bdf(bdf_filename, log=log, xref=True)
xyz_cid0 = model.get_xyz_in_coord(cid=0, fdtype='float32')
nid_map = {}
for i, (nid, node) in enumerate(sorted(iteritems(model.nodes))):
#xyz = node.get_position()
#xyz_cid0[i, :] = xyz
nid_map[nid] = i
eids_to_delete = get_bad_shells(model,
xyz_cid0,
nid_map,
max_theta=180.,
max_skew=1000.,
max_aspect_ratio=1000.)
assert eids_to_delete == [100], eids_to_delete
os.remove(bdf_filename)
def test_quad_180_01(self):
r"""
Identify a 180+ degree quad
y
^ 4
| / |
| / |
| / |
| / |
/ |
1------2 |----> x
\ |
\|
3
"""
msg = (
'CEND\n'
'BEGIN BULK\n'
'GRID,1,,0.,0.,0.\n'
'GRID,2,,1.,0.,0.\n'
'GRID,3,,2.,-1.,0.\n'
'GRID,4,,2., 1.,0.\n'
'CQUAD4,100,1, 1,2,3,4\n'
'PSHELL,1,1,0.1\n'
'MAT1,1,3.0,, 0.3\n'
'ENDDATA'
)
bdf_filename = 'cquad4.bdf'
with codec_open(bdf_filename, 'w') as bdf_file:
bdf_file.write(msg)
model = read_bdf(bdf_filename, xref=True)
xyz_cid0 = model.get_xyz_in_coord(cid=0, dtype='float32')
nid_map = {}
for i, (nid, node) in enumerate(sorted(iteritems(model.nodes))):
#xyz = node.get_position()
#xyz_cid0[i, :] = xyz
nid_map[nid] = i
eids_to_delete = get_bad_shells(model, xyz_cid0, nid_map, max_theta=180.,
max_skew=1000., max_aspect_ratio=1000.)
assert eids_to_delete == [100], eids_to_delete
os.remove(bdf_filename)
def test_quad_quality_02(self):
r"""
Identify bad quads
EID = 101 (skew)
y
^ 4
| / \
| / \
| / \
| / \
/ \
1------------------------------5-> x
\ /
\ /
3
EID = 102 (aspect ratio)
y
^ 8--------------------------6
| / /
| / /
| / /
| / /
/ /
1------------------------------5-> x
EID = 103 (taper ratio)
y
^ 8--------------7
| / \
| / \
| / \
| / \
/ \
1------------------------------5-> x
"""
msg = (
'CEND\n'
'BEGIN BULK\n'
'GRID,1,,0., 0.,0.\n'
#'GRID,2,,1., 0.,0.\n'
'GRID,3,,2., -1.,0.\n'
'GRID,4,,2., 1.,0.\n'
# shift x by 200
'GRID,5,,200., 0.,0.\n'
# shifted by 30 to match dx of GRID 8
#raised up to match 7,8 height
'GRID,6,,245., 100.,0.\n'
# raised up to prevent large thetas
# brought in to cause a taper
'GRID,7,,55., 100.,0.\n'
'GRID,8,,45., 100.,0.\n'
#'CQUAD4,100,1, 1,2,3,4\n'
'CQUAD4,101,1, 1,3,5,4\n'
'CQUAD4,102,1, 1,5,6,8\n'
'CQUAD4,103,1, 1,5,7,8\n'
'PSHELL,1,1,0.1\n'
'MAT1,1,3.0,, 0.3\n'
'ENDDATA'
)
log = SimpleLogger(level='error')
bdf_filename = 'cquad4.bdf'
with open(bdf_filename, 'w') as bdf_file:
bdf_file.write(msg)
model = read_bdf(bdf_filename, log=log, xref=True)
xyz_cid0 = model.get_xyz_in_coord(cid=0, fdtype='float32')
nid_map = {}
for i, nid in enumerate(sorted(model.nodes.keys())):
nid_map[nid] = i
max_skew_active = 70.
max_aspect_ratio_active = 50.
max_taper_ratio_active = 2.5
min_theta = 0.1
max_theta = 1000.
max_skew = 1000.
max_aspect_ratio = 1000.
max_taper_ratio = 1000.
#log = SimpleLogger(level='debug')
#model.log = log
# max skew
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta,
max_skew=max_skew_active,
max_aspect_ratio=max_aspect_ratio,
max_taper_ratio=max_taper_ratio)
assert eids_to_delete == [101], eids_to_delete
# aspect ratio
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio_active,
max_taper_ratio=max_taper_ratio,
)
assert eids_to_delete == [101], eids_to_delete
# taper ratio
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio,
max_taper_ratio=max_taper_ratio_active,
)
assert eids_to_delete == [103], eids_to_delete
os.remove(bdf_filename)
def test_quad_180_01(self):
r"""
Identify a 180+ degree quad
EID = 100 (max_theta > 180)
y
^ 4
| / |
| / |
| / |
| / |
/ |
1------2 |----> x
\ |
\|
3
"""
msg = (
'CEND\n'
'BEGIN BULK\n'
'GRID,1,,0., 0.,0.\n'
'GRID,2,,1., 0.,0.\n'
'GRID,3,,2., -1.,0.\n'
'GRID,4,,2., 1.,0.\n'
'CQUAD4,100,1, 1,2,3,4\n'
'PSHELL,1,1,0.1\n'
'MAT1,1,3.0,, 0.3\n'
'ENDDATA'
)
log = SimpleLogger(level='error')
bdf_filename = 'cquad4.bdf'
with open(bdf_filename, 'w') as bdf_file:
bdf_file.write(msg)
model = read_bdf(bdf_filename, log=log, xref=True)
xyz_cid0 = model.get_xyz_in_coord(cid=0, fdtype='float32')
nid_map = {}
for i, nid in enumerate(sorted(model.nodes.keys())):
nid_map[nid] = i
max_theta_active = 180.
min_theta = 0.1
max_skew = 1000.
max_aspect_ratio = 1000.
max_taper_ratio = 1000.
# max theta
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta_active,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio,
max_taper_ratio=max_taper_ratio)
assert eids_to_delete == [100], eids_to_delete
delete_bad_shells(
model,
min_theta=min_theta,
max_theta=max_theta_active,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio,
max_taper_ratio=max_taper_ratio)
assert len(model.elements) == 0, model.elements
os.remove(bdf_filename)
def test_tri_quality_01(self):
r"""
Identify a 180+ degree quad
EID = 100 (perfect)
y
^ 3
| / \
| / \
| / \
| / \
|/ \
1-----------2----> x
EID = 101 (???)
y
^ 6
| / \
| / \
| / \
| / \
|/ \
4----------------------5----> x
"""
msg = (
'CEND\n'
'BEGIN BULK\n'
'GRID,1,,0., 0.,0.\n'
'GRID,2,,1., 0.,0.\n'
'GRID,3,,0.5, 1.,0.\n'
'CTRIA3,100,1, 1,2,3\n'
'GRID,4,, 0., 0.,5.\n'
'GRID,5,,300., 0.,5.\n'
'GRID,6,, 0.5, 1.,5.\n'
'CTRIA3,101,1, 4,5,6\n'
'PSHELL,1,1,0.1\n'
'MAT1,1,3.0,, 0.3\n'
'ENDDATA'
)
log = SimpleLogger(level='error')
bdf_filename = 'cquad4.bdf'
with open(bdf_filename, 'w') as bdf_file:
bdf_file.write(msg)
model = read_bdf(bdf_filename, log=log, xref=True)
xyz_cid0 = model.get_xyz_in_coord(cid=0, fdtype='float32')
nid_map = {}
for i, nid in enumerate(sorted(model.nodes.keys())):
nid_map[nid] = i
max_skew_active = 70.
max_theta_active = 115.
max_aspect_ratio_active = 15.
min_theta = 0.1
max_theta = 1000.
max_skew = 1000.
max_aspect_ratio = 1000.
# max theta
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta_active,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio,
)
assert eids_to_delete == [101], eids_to_delete
# max skew
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta,
max_skew=max_skew_active,
max_aspect_ratio=max_aspect_ratio,
)
assert eids_to_delete == [101], eids_to_delete
# aspect ratio
eids_to_delete = get_bad_shells(
model, xyz_cid0, nid_map,
min_theta=min_theta,
max_theta=max_theta,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio_active,
)
assert eids_to_delete == [101], eids_to_delete
delete_bad_shells(
model,
min_theta=min_theta,
max_theta=max_theta_active,
max_skew=max_skew,
max_aspect_ratio=max_aspect_ratio,
)
assert eids_to_delete == [101], eids_to_delete