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bdf_model_groups.rst

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The standard nastran comment is supported. Nastran does nothing with it. ` $ CG GRID 1001 742.959 270. 89.4568`

Let's access that with code: `python bdf_model.nodes[1001].comment`

Comments can be modified and written out. Leave off the $.

Model Groups

Model groups intended as way to create tags for the GUI. They can be used for other tasks though.

They're loaded into bdf_model.model_groups and left as a comment on the card. As such, they're not written out because they'd lose their association with the data.

Some features:
  • An object may be in multiple groups at once
  • Element groups are recognized by --groups flag
  • node groups are recognized in the "Edit Geometry Properties" menu
Group types include:
  • nodes
  • elements
  • rigid_elements
  • masses
  • properties
  • materials
  • mpcs
  • spcs
  • loads

Correct: ` $ group: name='RLongeron MainFuseStruct Gridpoint'; nodes=167:205 $ group: name='Skin MainFuseStruc'; elements=6001:15017 $ group: name="ULFuseCanardAtch MainFuseStruct Fixed point constraints, 123"; spcs=3`

Incorrect due to a semicolon in the name: ` $ group: name="ULFuseCanardAtch MainFuseStruct Fixed point constraints; 123"; spcs=3`

Unioned Groups (spcs becomes [1,2,3] internally): ` $ group: name="spcs"; spcs=1 $ group: name="ULFuseCanardAtch MainFuseStruct Fixed point constraints, all"; spcs=1 SPC1 1 123456 13 $ group: name="spcs"; spcs=2 $ group: name="ULFuseCanardAtch MainFuseStruct Fixed point constraints, 123456"; spcs=2 SPC1 2 123456 13 $ group: name="spcs"; spcs=3 $ group: name="ULFuseCanardAtch MainFuseStruct Fixed point constraints, 123"; spcs=3 SPC1 3 123 13`