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-   -   divergence detected (http://www.cfd-online.com/Forums/fluent/93008-divergence-detected.html)

dhakshna October 1, 2011 19:43

divergence detected
 
divergence detected-temporarily reducing courant number 0.5

3DmaniacSLDWRKS October 3, 2011 20:53

courant number is C.deltat/deltax . for explicit methods to be stable this number in most methods needs to be smaller that 1, depending on the method it could be more restrictive.
it is good practice to keep this value smaller than one when you're staring the solution. so decrease the time-step. Divergence could have alot more reasons you need to be more specific. you can find more information on divergence and how to improve convergence on the forum.

dhakshna October 10, 2011 03:29

Quote:

Originally Posted by 3DmaniacSLDWRKS (Post 326559)
courant number is C.deltat/deltax . for explicit methods to be stable this number in most methods needs to be smaller that 1, depending on the method it could be more restrictive.
it is good practice to keep this value smaller than one when you're staring the solution. so decrease the time-step. Divergence could have alot more reasons you need to be more specific. you can find more information on divergence and how to improve convergence on the forum.


i used density based solver under steady state condition..i got time step reduced after that i got divergence detected-temporaily courant number reduced to 0.05..


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