Ansys Learning Forum Forums Discuss Simulation LS Dyna Creating an Air Area Reply To: Creating an Air Area

Ian Do
Ansys Employee

Hello 小松,

ALE can be considered as an independent hydrocode solver, or it can also "couple" with our LS-DYNA solver to provide for fluid-structure interaction (FSI). In that case, the ALE materials can interact with the LAG parts/mats.

There are 2 ALE solver versions:

OLD solver version = unstructured ALE mesh allowed ==> uses *CONSTRAINED_LAGRANGE_IN_SOLID (CLIS) for providing the interaction between the ALE mats (fluids) and the LAG structure.

NEW solver version = assumes ALE mesh is structured (regular mesh indices in XYZ dirs), so it is called STRUCTURED-ALE (or SALE) ==> this uses *ALE_STRUCTURED_MESH_FSI (for coupling) which is a simplified but much easier to use version of CLIS. I would use the newer SALE. Both will require a lot of time investment in learning how to use. 

To your question:

Air may be defined via *MAT_NULL + *EOS_IDEAL_GAS.

Pls consult the ANSYS Learning Hub for online seminar on ALE before using it. It will save you lots of time.

 

Ian Do