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-   -   Porosity field in Fluent (http://www.cfd-online.com/Forums/fluent/68972-porosity-field-fluent.html)

wojciech October 7, 2009 15:28

Porosity field in Fluent
 
Hi,

I modelling flow trough a porous medium. A wrote a UDF with the Ergun equation. I tested this UDF, and it is working when the porosity is constant. But in my project I need define not a constatnt value of porosity, but a scalar field (with small fluctuations of the porosity in each direction). I can not use the DEFINE_INIT function, because in Fluent a porosity variable is not present. For the same reason, I can not use it in a UDF (the Porosity value from the Porous Zone tab). For this reason, I defined a UDS. I can initialize now the UDS with DEFINE_INIT and after initialization the porosity field is correct (I can see it in post-processor). But, when the calculations begin, the porosity field changes. What can be the reason? I will only define a porosity field, and this field should be constant in time. I would add that I defined a very small value of the UDS Diffusitivity too (when is 0, than the Fluent can not benign calculations). I use Fluent in version 6.2.16.

Can someone help me?

Wojciech

sarah l September 20, 2010 11:19

Wojciech , have you solved your problem? really this time I have this problem , could you help me?
thanks
Sarah


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