hi, to improve a result,i've tried to refine the mesh and to minimise the residual but i still need a better one!!what solving parameter can i modify?? thanks

Donia, please check your Courent number for your specific grid and time step, this should help to get better results, Tomasz

thanks Tomasz,but what do you mean by courent number?

Courant number is kind of stability criteria for CFD computation - you can find decription in any CFD book

Donia, look here: http://www.mech.uq.edu.au/courses/me...der-relaxation

thanks a lot Tomasz!!