New Question: I am trying to change the level of ground by using dynamic mesh in steady analysis. I tried using the Dynamic geometry UDF and supplied it on dynamic compiler, The code builds and opens also, I hooked it on the ground surface for the change in the level or depth but it says negative cell volume error. I am using the flux(KG/m2-sec)/density(Kg/m3)*time for quasi-steady calculation of snow depth. However, I have issues on coding the UDF, I have the flux saved in UDMI but I think it is a cell centered value. But, geometry can be only deformed using positions as I learned from the ANSYS fluent user guide and the UDF manual. How to sort this issue? Can anyone provide me some info here?n