actually it is something more complex, and i didnt go from of10 to foam-extend 5.0 I have this EM solver from Pascal Beckstein paper, and I have to combine it with chtMultiRegionFoam however his solver is written in this class base kindoff code, so I will have to figure that out manually and rewrite the structure of chtMultiRegionFoam from foam-extend 5.0