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Divergence with source UDF for VOF

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Old   September 2, 2014, 22:42
Default Divergence with source UDF for VOF
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Hi everybody
I wrote an UDF for sources (lift, drag, virtual mass forces and K and epsilon) for VOF model two phase(steel and injecting argon). the simulation converged without sources but when the source became activated the simulation diverged suddenly after 1.5 sec with this error:sweeping relaxation factors, divergence in X momentum y momentum, z, k , epsilon- divergence detected in AMG solver: x-momentum', floating point exception .
Global Courant number was stable before divergence.
I did the following procedures:
1- limiting the sources to just above argon inlet and below the free surface
2- changing the URF of sources from 0.1 to 0.05
but still diverging suddenly. I really dont have any idea whether it is a structural error in sources or errors in setting of fluent.
Much appreciated if anybody help me to find the error.
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Old   September 3, 2014, 01:51
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Since you mentioned that it worked without the source term, something might be wrong with the source term calculation. If you share your UDF with a short description, I'll have a look. The "floating point exception" error usually happens due to a bad math throughout the code such as division by zero or some variables go to infinity and etc.
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Old   September 3, 2014, 06:51
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Dear SUN
I would be appreciated if you give me your email. I would send my UDF to you.
Thanks in advance
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Old   September 3, 2014, 10:55
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You can send it via private message.
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Old   December 28, 2014, 01:16
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I m also facing same prlm...

Last edited by rishitosh; December 28, 2014 at 03:18.
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