Thank you very much for your help Rob. I want to get a workbench for different type of analysis so, I asked in a general way because I know this problem dependence but I have not an accurate answer in my case. I understand it is not a simple answer because a lot of factors are involved but maybe your experience can offer a better vision than mine for this general proposal.
We have a few licences but I only asked for 2 simultaneous simulation no more. I think RAM is an important factor but my question was directed to processor because I read something about the relationship with the licence but maybe I was wrong.
If I try to limit the type of problem, I think it will work on heat transfer focused problems with slow flows in 3D analyses with the order of magnitude of a few millions of elements.
Thank you Rob. It is really nice to see your helping comments again!