FEM mesh or element size dependency test

[mechanicaljw]

Hello All,

I have done an FEM simulation and have this question. Is there a way you can know that your solution (Stress analysis or modal analysis) is mesh independent? I have varied the mesh resolution and each time i am getting a variation mostly in the first and second mode frequencies. The third, fourth, fifth and sixth seem to be changing less. So I am wondering whether the various values i am getting are physical (real or mesh independent) or non-physical (due to numerical errors, or mesh dependent). I am using ANSYS Modal as solver.

Any hint on how to get a mesh independent solution in FEM would be appreciated.

Thanks in advance!
Jimmy