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how to define a neuman boundary condition

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Old   June 5, 2007, 07:26
Default how to define a neuman boundary condition
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Hi! I want to define a neuman boundary condition (dYi/dn = cte) for a mass fraction Yi in the interior surface. Please tell me how to do it! Thanks
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Old   June 9, 2007, 02:49
Default Re: how to define a neuman boundary condition
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Hi, I have written an UDF for neuman boundary condition for species mass fraction at the pressure outlet. It is compiling and after loading when i want to hook it the udf file "species_grad" is displaying at BOUNDARY CONDITION-FLUID-SOURCE TERM" instead of at species mass fraction at the pressure outlet. Pls look it. it may help u.

#include "udf.h"



float source=0.0;

begin_c_loop(cell, thread)







return source;


If u can solve my problem i will be great full to u.

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