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-   -   convergence limits (http://www.cfd-online.com/Forums/cfx/74793-convergence-limits.html)

c120613 April 8, 2010 11:32

convergence limits
 
Dear all,

I'm working to simulate a fan on CFX and after the numerical simulation I saw that the residual level doesn't go down below E-3, E-4. Then I want to know which parameter I can play on, in order to achieve a residual level around E-5, E-6.

Kind regards

Domenico di Cugno

mach000 April 8, 2010 11:40

if you are simulating a steady run, you can reduce the timestep value.

if you are simulating a unsteady run, you have two possibilities:

a) reduce the dt

b) increase the number of the sub-iterations at every timestep

ghorrocks April 8, 2010 18:13

Again, this question has been asked a million times - please refer to the FAQ

http://www.cfd-online.com/Wiki/Ansys...gence_criteria


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