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-   -   Convergence in CFX5.7 (http://www.cfd-online.com/Forums/cfx/20511-convergence-cfx5-7-a.html)

KKA July 20, 2004 20:26

Convergence in CFX5.7
 
Dear all

I'm currently running a draft tube problem with 3 outlets. CFX5.7 always complains about backflows into the domain when I specified outlet BCs. I then discarded and rather specified OPENINGS which actually represent the original problem. CFX didn't complain about walls anymore but instead there is a problem with convergence. It just oscillated around 10e-2 as max Residual but the target was 10e-5. I did reduce the timesteps and try all probable causes of this problem but none of them seems to slove the problem. Has anybody encountered such a problem? Any advice or tips on this is highly welcome.

Thanks a lot for responding to this!!

cheers

Glenn Horrocks July 26, 2004 22:52

Re: Convergence in CFX5.7
 
Hi KKA,

Try using outlets, and moving them further away from the region of interest.

Glenn


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