CFD Online Discussion Forums

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-   Fluent UDF and Scheme Programming (http://www.cfd-online.com/Forums/fluent-udf/)
-   -   about DEFINE_SOURCE(name, c, t, dS, eqn) (http://www.cfd-online.com/Forums/fluent-udf/63103-about-define_source-name-c-t-ds-eqn.html)

lx33101128 March 28, 2009 10:01

about DEFINE_SOURCE(name, c, t, dS, eqn)
 
dear all
the UDF manual says that the dS is the source term derivative. Does this term is indispensable or optional? it seems that this term is just used to aid stability, but i am not sure. in my case, if dS was added, the converging rate was very very very slow. howerver, if i didn't set the value of dS, the rate is very rapid.look forward to you reply!!

HenrikS March 31, 2009 09:21

It is optional, and should be included if it helps convergence, as far as I understand.

lx33101128 March 31, 2009 21:41

thanks very much


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