Hi, I am using MARS differencing scheme for UVW-mom (with standard K-e, incompressible, hexa mesh) to simulate oil flows through a spool. The case seems not complicated, but it is difficult to converge. Any sugguestions about it?

Reduce the Blending Factor value to around 0.2. This will make it converge faster but still maintain a second order accuracy.

and then try to move the blending back to see if you came to the same solution....

Does it converge with UD?

I think you should try make Blending Factor value greater than 0.6. But it make more time! And try to use double presccision for solver. Does *info file contain any WARNINGS?

Thanks for your suggestion. I am trying the blending factor of 0.2 and will get results soon.

This case converges with UD (also double precision, without any wornings) very fast.