I did just finish it, I wrote my """"own"""" rhoPimpleFoam. Or as you can see own with a large quotation because yeah it is just loads of copy paste but it is in a different kindoff class framework now thanks for the advice. I am not going to perform the multiregion including the solid now. Still now running a simulation to see if the numerical values i get make any sense 🙂 need to compare with rhoPimpleFoam