Reply To: How to define the control volume in the keyword Simple_airbag_model?

[Alex R.]

Hi, 

1) The airbag needs to be defined using a single *SET_SEGMENT containing shell part and outer surface of the solid box. The normal vectors of this segment should be facing outwards from the AIRBAG. Please look at this similar problem containing a sphere in a cylinder. The sphere normals are pointing to the center while the cylinder normals are pointing outwards. The control volume of the airbag will be between the cylinder and sphere.

2) The thermal expansion (no heat transfer between the structure and the airbag) can be added using *MAT_ADD_THERMAL_EXPANSION and *LOAD_THERMAL_LOAD_CURVE. Please see the example https://www.dynaexamples.com/thermal/thermal-expansion/thermal-load

Please let us know how it goes,
Thank you,

Alex