Hi!ı am trying to solve a laminar flow in the neighbourhood of a disk rotating in fluid at rest.I am using 2d axisymetric swirl solver and laminar model.angular velocity of disk is 0.5 rad/s.But residuals of contunity did not decrease enough ı can not find the reason is there any body have an idea about this problem?

Are u sure this is a laminar problem? try to use the k-e; it will give good results also if the problem is really laminar. How's your mesh on the boundary?

ı tried different kinds of mesh but the solution is same.also ı used 2d and 2ddp.now a ı am using uniform mesh.Pressure inlet-pressure outlet-wall-axis are my boundary conditions.

Verify that you have enough points within your Ekmann layer...at least 10....

use presto, and use high underrelaxation factor for the pressure and low for the velocity...

sdfa