Thanks.Now，i face with another problem:the calculation can not convergence.Can you give me some advice?

Convergence is dependent on many factors, I recommend you search the forum for convergence problems with the solver you are using and if you cannot find anything then make another separate thread.

Philip

Very thanks.there is still have a crazying problem.I carefully get the .cas file .but the error occur again when i make the domain bigger.Is the OpenFOAM not steady?

I believe the OpenFOAM convertor is fine and there is a problem with your mesh.

Can you post a link to your fluent mesh that does not work here.

Philip