CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   CFX residual bouncing (http://www.cfd-online.com/Forums/cfx/98676-cfx-residual-bouncing.html)

wind81 March 16, 2012 03:02

CFX residual bouncing
 
1 Attachment(s)
Hi, i'm doing the simulation of the spray with water mist. Initally i'm using mass flow rate of 2g/s of injected water mist, the solver is steady and converge, When i increase the mass flow rate of the injected water mist to 200g/s, I'm facing the convergence issue and the residual is bouncing as shown in the attachment. May i know how can i resolve this issue? Any one can help me? Thanks.

hosseinhgf March 16, 2012 03:32

i think with decreasing time scale.

wind81 March 16, 2012 04:36

Hi, thanks for your reply. Currently, i'm using auto time scale, should i change to physical time scale, and use small time step?
Thanks.

ghorrocks March 16, 2012 05:27

Quote:

i think with decreasing time scale.
In general this is wrong and will make it worse.

Try reading this FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

wind81 March 16, 2012 05:49

Hi, Thanks for your reply ghorrocks. now i trying with larger physical time, see whether it work or not..


All times are GMT -4. The time now is 14:16.