[sakurabogoda]

Dear all,
I am simulating a cyclone separator by LES. (Ansys cfx 14)
I could run the program for 5m/s inlet velocity but for 10m/s, it faied due to following error. (time step is 0.001s)

"ERROR 004100018 has occurred in subroutine FINMES. Message: Fatal overflow in linear solver. "

I know this is because my simulation is diverged.

Then I used a finer mesh, firstly it was 533,867 nodes and now 4,290,589. With 533,867 grids it failed after 3,549 time loops but now with 4,290,589 grids) fails within 2 loops.

Another fact is that I could run both 5m/s and 10m/s with attached geometry (Before.png) and all errors came with new geometry (After.png).

Can anybody help me?

I am working with this for 2 weeks, but cannot fix.

Thanks.
Sakura.