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’)

pyNastran.bdf.mesh_utils.mirror_mesh.bdf_mirror(bdf_filename: PathLike | BDF, plane: str = 'xz', log: SimpleLogger | None = None, debug: bool = True) → tuple[BDF, int, int][source]

Mirrors the model about the symmetry plane

Parameters:
bdf_filenamestr / BDF()

str : the bdf filename BDF : the BDF model object

logSimpleLogger | None

the logger

debug: bool | str; default=True

debug flag (True=debug, False=warning, info, error)

planestr; {‘xy’, ‘yz’, ‘xz’}; default=’xz’

the plane to mirror about xz : +y/-y yz : +x/-x xy : +z/-z

Returns:
modelBDF()

BDF : the BDF model object

nid_offsetint

the offset node id

eid_offsetint

the offset element id

pyNastran.bdf.mesh_utils.mirror_mesh.bdf_mirror_plane(bdf_filename: PathLike | BDF, plane: NDArray33float, mirror_model=None, log=None, debug: bool = True, use_nid_offset: bool = True)[source]

mirrors a model about an arbitrary plane

pyNastran.bdf.mesh_utils.mirror_mesh.write_bdf_symmetric(bdf_filename: PathLike | BDF, out_filename=None, encoding=None, size: int = 8, is_double: bool = False, enddata: bool | None = None, close: bool = True, plane: str = 'xz', log=None)[source]

Mirrors the model about the symmetry plane

Parameters:
bdf_filenamestr / BDF()

str : the bdf filename BDF : the BDF model object

out_filenamevaries; default=None

str - the name to call the output bdf file - a file object StringIO() - a StringIO object None - pops a dialog

encodingstr; default=None -> system specified encoding

the unicode encoding latin1, and utf8 are generally good options

sizeint; {8, 16}

the field size

is_doublebool; default=False

False : small field True : large field

enddatabool; default=None

bool - enable/disable writing ENDDATA None - depends on input BDF

closebool; default=True

should the output file be closed

planestr; {‘xy’, ‘yz’, ‘xz’}; default=’xz’

the plane to mirror about xz : +y/-y yz : +x/-x xy : +z/-z

Returns:
modelBDF()

BDF : the BDF model object

nid_offsetint

the offset node id

eid_offsetint

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