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
--groupsflagnode 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
`
Comments
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
$.