delete_bad_elements Module¶
- defines:
- model = delete_bad_shells(model, max_theta=175., max_skew=70., max_aspect_ratio=100.,
- max_taper_ratio=4.0)
- eids_to_delete = get_bad_shells(model, xyz_cid0, nid_map, max_theta=175., max_skew=70.,
- max_aspect_ratio=100., max_taper_ratio=4.0)
-
pyNastran.bdf.mesh_utils.delete_bad_elements.delete_bad_shells(model, min_theta=0.1, max_theta=175.0, max_skew=70.0, max_aspect_ratio=100.0, max_taper_ratio=4.0)[source]¶ Removes bad CQUAD4/CTRIA3 elements
Parameters: - model : BDF ()
this should be equivalenced
- min_theta : float; default=0.1
the maximum interior angle (degrees)
- max_theta : float; default=175.
the maximum interior angle (degrees)
- max_skew : float; default=70.
the maximum skew angle (degrees)
- max_aspect_ratio : float; default=100.
the max aspect ratio
- taper_ratio : float; default=4.0
the taper ratio; applies to CQUAD4s only
-
pyNastran.bdf.mesh_utils.delete_bad_elements.element_quality(model, nids=None, xyz_cid0=None, nid_map=None)[source]¶ Gets various measures of element quality
Parameters: - model : BDF()
a cross-referenced model
- nids : (nnodes, ) int ndarray; default=None
the nodes of the model in sorted order includes GRID, SPOINT, & EPOINTs
- xyz_cid0 : (nnodes, 3) float ndarray; default=None
the associated global xyz locations
- nid_map : Dict[nid]->index; default=None
a mapper dictionary
Returns: - quality : Dict[name]
Various quality metrics names : min_interior_angle, max_interior_angle, dideal_theta,
max_skew_angle, max_aspect_ratio, area_ratio, taper_ratio, min_edge_length
- values : The result is
np.nanif element type does not define the parameter. For example, CELAS1 doesn’t have an aspect ratio.
- values : The result is
Notes
- pulled from nastran_io.py
-
pyNastran.bdf.mesh_utils.delete_bad_elements.get_bad_shells(model, xyz_cid0, nid_map, min_theta=0.1, max_theta=175.0, max_skew=70.0, max_aspect_ratio=100.0, max_taper_ratio=4.0)[source]¶ Get the bad shell elements
Parameters: - model : BDF()
the model object
- xyz_cid0 : (N, 3) float ndarray
the xyz coordinates in cid=0
- nid_map : dict[nid]
- nid : int
the node id
- index : int
the index of the node id in xyz_cid0
- min_theta : float; default=0.1
the maximum interior angle (degrees)
- max_theta : float; default=175.
the maximum interior angle (degrees)
- max_skew : float; default=70.
the maximum skew angle (degrees)
- max_aspect_ratio : float; default=100.
the max aspect ratio
- taper_ratio : float; default=4.0
the taper ratio; applies to CQUAD4s only
Returns: - eids_failed : List[int]
element ids that fail the criteria
- shells with a edge length=0.0 are automatically added
-
pyNastran.bdf.mesh_utils.delete_bad_elements.get_min_max_theta(faces, all_node_ids, nid_map, xyz_cid0)[source]¶ get the min/max thetas for CTETRA, CPENTA, CHEXA, CPYRAM