Hi Somanath,

Your problem seems to be simple, so please check the boundary conditions first. What are the values of URF that you are using ? How is your mesh quality (skewness/aspect ratio etc), because if the mesh is not good, solution will never converge.

Is your residual curve flat or fluctuating ?

Thanks,

Rajesh.

As Rajesh wrote above, a non-converged solution may depend on several things and you need to check these. It may be due to poor mesh quality, strange boundary conditions, numerical scheme etc.

Hi, 

Hope this link helps.

http://www.cfd-online.com/Forums/blogs/centurion2011/2084-convergence-ansys-fluent.html

Cheers,

Sivam

@ Rajesh Alayil 

residual curve is flat.  Is it anything related to relaxation factor?

What is the level of convergence you have set ?

@ Somanath, if the residual is flat. Why do u think the solution is not converged ? What are the residual values ? if these are high and the same is the reason why u feel the solution is not converged, then reduce the under relaxation factor to bring down the residuals.

Also, are there any monitors, are these curves flat ?

Hope it help, thanks

Rajesh.