CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   Advice for convergence problem (http://www.cfd-online.com/Forums/cfx/19271-advice-convergence-problem.html)

David November 1, 2002 21:04

Advice for convergence problem
 
Hi, everybody. I am simulating a gas/liquid two-phase multicomponents flow with reactions in liquid phase. After 70 steps, the solver was terminated with overflow errors. Could anybody please give me some advice how to get a converged solution? Many thanks.

David

Mike November 1, 2002 21:56

Re: Advice for convergence problem
 
Need some more details really... If you look at the results before the solver overflows (maybe at the 60th iteration) what do they look like? Is there a particular location where it looks totally unrealistic (maybe you get huge velocities near an inlet?). What's the physics setup (which multiphase models, drag models), what type of flow is it (e.g dispersed gas in a continuous liquid?). Mike

David November 2, 2002 03:29

Re: Advice for convergence problem
 
Thanks a lot, Mike. Yes, the flow is a dispersed gas in a continuous liquid in a pipe. The inlet velocity is very slow, about 0.7cm/sec. I use Schiller Naumann Drag model.

Regards David

Mike November 2, 2002 13:26

Re: Advice for convergence problem
 
That is slow - what's the Reynolds Number? Could it be Laminar flow but you are applying a turbulence model? Mike

David November 3, 2002 03:00

Re: Advice for convergence problem
 
Good suggestion, I'll try. Thanks Mike.

David


All times are GMT -4. The time now is 12:20.