Ansys Employee

 Hello Claudia, 

There could be many reasons for this error. 1) Improper boundary conditions;  2) Improper solver settings;  3) improper set-up of dynamic mesh. To assist you better, can please share some details like boundary conditions used, overall mesh quality and what kind of dynamic mesh you using? Can you also share your residual plots? 

As you run your simulation, can you also check if the dynamic mesh deteriorates the mesh quality.