Learning Forum

[MADAYE]

hi~nI saw a paper write by ?Jim Day, LSTC?, the title is ?Guidelines for ALE Modeling in LS-DYNA?. In this paper, quote ? the ALE solver is not a full Navier-Stokes solver and thus does not account for fluid boundary layerneffects such as drag. Effects of fluid viscosity derive solely via the material model, e.g., via MUnin *mat_null. The ALE solver (ALE compressible flow solver) has been developed with thenintent of simulating short duration problems with high pressure and velocity gradients.?nI looked into DYNA manual, it does not contain the governing equation of fluid.nSo my question is, which governing equation of fluid does DYNA ues in ALE? Why it is not a full Navier-Stokes solver?Is it a compressible flow solver or not?nI cannot find my answer by google it, So i come here and hope professional can help me.nThanks a looot!

[Rob]

If you click on Help in the current release there should be information under the links in the Keyword and Theory section. n

[MADAYE]

If you click on "Help" in the current release there should be information under the links in the "Keyword and Theory" section.https://forum.ansys.com/discussion/comment/98136#Comment_98136

Thanks for your suggest, I looked in the dyna manager. There are only Keyword and Theory manual. I dived in these manual before, there are only vague description about math in ALE FLOW SOLVER. Not enough to tell which kind of N-S equation this solver used.nn

[Rob]

If it's not covered in the manual we can't explain in more detail on here as this is a public forum. Other community members can answer in more detail, it's a restriction placed on Ansys staff by export laws because of the nature of our work & expertise. n

[MADAYE]

OK, I understand. Thanks any way.n

[Xudong Ye]

Maybe it's too late to answer this question, recently I just found related article for my master's thesis. That is "Validation of Computational Fluid-Structure Interaction Models By Comparison with Collapsible Tube Experiments".