Cfx-mesh
 

I have solved a problem using CFX 12.0, now I want make the mesh a little finner in CFX-mesh, but each time I do it, my problem diverges as I try to solve it, i.e. the CFX-solver faces with an error after 50 timesteps.

help me with understanding why such problem occurs.

Thank you.

Finer mesh are more numerically unstable. There are tips on convergence on the documentation, some more here http://www.cfd-online.com/Wiki/Ansys...gence_criteria