I am solving a FSI due to an explosion. To do, I built the fluid solver. To couple with the fluid, I tried to find a good solution approach and found that the continuum-based solid code is useful to couple with a fluid solver since its equations are identical to those in the fluid. That means there are the conservation laws. I am considering a nonlinear material(or Kirchhoff material) written as S=DE. S is the second PK stress, D is the elastic modulus and E is the Green-Lagrange strain. It is similar to the linear elastic one.

My question are 1. Can we use a continuum-based solid code for FSI? 2. For use, I transformed the 2PK stress to the Cauchy stress to put in the equation of motion. Is it reasonable? 3. Is there any validation tool for this kind? I could not find any validatation method for this. 4. Is there any other approach for general FSI?

Thanks in advance.

By continuum do you perhaps mean Eulerian-based? If so the type of code you are referring to for the solid modeling is a hydrocode, such as HULL (try this link):

library.lanl.gov/cgi-bin/getfile?00326860.pdf

I meant that the governing equations in the structure are identical to those in the fluid. But the solid is described on an Lagrangian mesh. So, it is different from an Eulerian one. Anyway thanks.