mirror_mesh Module¶
- This file defines:
- model, nid_offset, eid_offset = bdf_mirror(bdf_filename, plane=’xz’)
- model, nid_offset, eid_offset = write_bdf_symmetric(
- bdf_filename, out_filename=None, encoding=None, size=8, is_double=False, enddata=None, close=True, plane=’xz’)
- model = make_symmetric_model(
- bdf_filename, plane=’xz’, zero_tol=1e-12, log=None, debug=True)
-
pyNastran.bdf.mesh_utils.mirror_mesh.__mirror_elements(model, mirror_model, nid_offset, eid_offset)[source]¶ mirrors model.elements
-
pyNastran.bdf.mesh_utils.mirror_mesh.__mirror_rigid_elements(model, mirror_model, nid_offset, eid_offset)[source]¶ mirrors model.rigid_elements
-
pyNastran.bdf.mesh_utils.mirror_mesh._asymmetrically_mirror_aero_coords(model, aero_cids_set, cid_offset, plane='xz')[source]¶ we’ll leave i the same, flip j, and invert k
-
pyNastran.bdf.mesh_utils.mirror_mesh._mirror_aero(model, nid_offset, plane)[source]¶ Mirrors the aero cards
- Considers:
- AEROS
- doesn’t consider sideslip
- CAERO1
- doesn’t consider sideslip
- considers Cp
- considers lchord/lspan/nchord/nspan
- SPLINE1 - handle boxes
- SET1 - handle nodes
- Doesnt consider:
- AELIST
- AESURF
- AERO
- AEFORCE
- AEPRES
- CAERO2/3/4/5
- PAERO1/2/3/4/5
- AESURFS
-
pyNastran.bdf.mesh_utils.mirror_mesh._mirror_elements(model, mirror_model, nid_offset, use_eid_offset=True)[source]¶ Mirrors the elements
- elements:
- 0d : CELAS1, CELAS2, CELAS3, CELAS4, CDAMP1, CDAMP2, CDAMP3, CDAMP4, CDAMP5
- CFAST, CBUSH, CBUSH1D
2d : CTRIA3, CQUAD4, CTRIA6, CQUAD8, CQUAD, CTRIAR, CQUADR 3d : ??? missing : CVISC, CTRIAX, CTRIAX6, CQUADX, CQUADX8, CCONEAX
- rigid_elements:
- loaded: RBE2, RBE3 missing: RBAR, RBAR1
- mass_elements:
- loaded: CONM2 missing CONM1, CMASS1, CMASS2, CMASS3, CMASS4
Notes
Doesn’t handle CBAR/CBEAM offsets Doesn’t handle CBEAM SPOINTs
-
pyNastran.bdf.mesh_utils.mirror_mesh._mirror_loads(model, nid_offset=0, eid_offset=0)[source]¶ Mirrors the loads. A mirrored force acts in the same direction.
- Considers:
- PLOAD4
- no coordinate systems (assumes cid=0)
- FORCE, FORCE1, FORCE2, MOMENT, MOMENT1, MOMENT2
- PLOAD, PLOAD2
- TEMP, QVOL, QHBDY, QBDY1, QBDY2, QBDY3
-
pyNastran.bdf.mesh_utils.mirror_mesh._mirror_nodes(model, plane='xz')[source]¶ Mirrors the GRIDs
Warning
doesn’t consider coordinate systems; it could, but you’d need 20 new coordinate systems
Warning
doesn’t mirror SPOINTs, EPOINTs
-
pyNastran.bdf.mesh_utils.mirror_mesh._mirror_nodes_plane(model, mirror_model, plane, use_nid_offset=True)[source]¶ Mirrors the GRIDs about an arbitrary plane
Parameters: - model : BDF
???
- mirror_model : BDF
???
- plane : str
???
- use_nid_offset : bool
???
Returns: - nid_offset : int
the node id offset
- plane : str
the sorted plane; ZX -> xz
Warning
doesn’t consider coordinate systems; it could, but you’d need 20 new coordinate systems
Warning
doesn’t mirror SPOINTs, EPOINTs ..
-
pyNastran.bdf.mesh_utils.mirror_mesh._plane_to_iy(plane)[source]¶ gets the index fo the mirror plane
-
pyNastran.bdf.mesh_utils.mirror_mesh.bdf_mirror(bdf_filename, plane='xz', log=None, debug=True)[source]¶ Mirrors the model about the symmetry plane
Parameters: - bdf_filename : str / BDF()
str : the bdf filename BDF : the BDF model object
- plane : str; {‘xy’, ‘yz’, ‘xz’}; default=’xz’
the plane to mirror about xz : +y/-y yz : +x/-x xy : +z/-z
Returns: - model : BDF()
BDF : the BDF model object
- nid_offset : int
the offset node id
- eid_offset : int
the offset element id
-
pyNastran.bdf.mesh_utils.mirror_mesh.bdf_mirror_plane(bdf_filename, plane, mirror_model=None, log=None, debug=True, use_nid_offset=True)[source]¶ mirrors a model about an arbitrary plane
-
pyNastran.bdf.mesh_utils.mirror_mesh.get_model(bdf_filename, log=None, debug=True)[source]¶ helper method
-
pyNastran.bdf.mesh_utils.mirror_mesh.make_symmetric_model(bdf_filename, plane='xz', zero_tol=1e-12, log=None, debug=True)[source]¶ Makes a symmetric model from a full model
Parameters: - bdf_filename : str / BDF()
str : the bdf filename BDF : the BDF model object
- plane : str; {‘xy’, ‘yz’, ‘xz’}; default=’xz’
the plane to mirror about xz : +y/-y yz : +x/-x xy : +z/-z
- zaero_tol : float; default=1e-12
the symmetry plane tolerance
Returns: - model : BDF()
BDF : the BDF model object
- ## TODO: doesn’t handle elements straddling the centerline
-
pyNastran.bdf.mesh_utils.mirror_mesh.write_bdf_symmetric(bdf_filename, out_filename=None, encoding=None, size=8, is_double=False, enddata=None, close=True, plane='xz', log=None)[source]¶ Mirrors the model about the symmetry plane
Parameters: - bdf_filename : str / BDF()
str : the bdf filename BDF : the BDF model object
- out_filename : varies; default=None
str - the name to call the output bdf file - a file object StringIO() - a StringIO object None - pops a dialog
- encoding : str; default=None -> system specified encoding
the unicode encoding latin1, and utf8 are generally good options
- size : int; {8, 16}
the field size
- is_double : bool; default=False
False : small field True : large field
- enddata : bool; default=None
bool - enable/disable writing ENDDATA None - depends on input BDF
- close : bool; default=True
should the output file be closed
- plane : str; {‘xy’, ‘yz’, ‘xz’}; default=’xz’
the plane to mirror about xz : +y/-y yz : +x/-x xy : +z/-z
Returns: - model : BDF()
BDF : the BDF model object
- nid_offset : int
the offset node id
- eid_offset : int
the offset element id
Notes
- Updates the BDF object to be symmetric
- see bdf_mirror if you don’t want to write the model
Doesn’t equivalence nodes on the centerline.
- Considers
- nodes : GRID
- elements, rigid_elements, mass_elements : see
_mirror_elements - loads : see
_mirror_loads - aero cards : see
_mirror_aero