ALE bc Vs boundry mat law 11

Altair Forum User

I am doing an FSI problem with structure as Lagrangian and fluid modeled as ALE. Structural elements are  node connected to fluid elements within a small finite domain. Initialy, fluid is given an imposed velocity at inlet nodes.

 

Now, I want the fluid domain to behave like an infinite domain. Should I use mat law 11 at all boundaries or use ALE bc on boundary nodes? What is difference between normal boundary condition and ALE boundary condition?

 

Plz help.

 

Thanks.

Altair Forum User

Yes,  you need LAW11 to simulate an infinite fluid domain. The ALE BC use LAW11 is used to get silent layers - where are no wave reflection when it reach the boundary layers.