FSI Questions: Slamming of wedge

Hi!

I'm trying to learn more about setting up FSI analyses in HyperWorks by coupling Radioss and AcuSolve. I first want to start with a simple case, which is a 2D wedge impacting water, and I've tried to model this as best I could. There are a number of issues I stumble upon, but I lack too much of the knowledge of the software to even understand why there is a problem there. I have attached the solverdeck files to this thread. If any of you feel like being a very good samartian, now is a golden opportunity to highlight my mistakes and misunderstandings. It would be highly appreciated!

I can perhaps start off with a few questions:

I find boundary condition treatment quite different from what I'm used to with FVM based codes. I would ideally model only half of the wedge and domain, and add a symmetry plane to mirror the solution, but I'm not sure of how to do this. I therefore modelled the full domain, and have now made a part called 'Boundary' which includes all the surfaces except the wedge. I made a surface mesh, and made a LAW51 material with '3: Outlet boundaries to Multi-Material Law' and ALE CFD Formulation set to Eulerian. Is this sensible? Or do I need to make a solid volume mesh instead of a surface mesh? The reason I ask is that I get a huge number of errors when I try to run the file in the HyperWorks solver. Nearly all of them are connected to the elements, for example:

ERROR ID :    62
** ERROR IN MATERIAL/ELEMENT DEFINITION (LAW)
DESCRIPTION :  
   -- MATERIAL ID :    2
   -- MATERIAL TITLE : Boundary
   INVALID MATERIAL LAW 51
   FOR SHELL ELEMENT ID=963

It doesn't make much sense (to my mind) to make another volume mesh which also includes the fluid domain, just in order to get the surface boundary conditions right - but is that the right thing to do?

Maybe we can start there, and I can follow up with more questions as we go along.

Best regards,
Andreas.