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UDF Contours

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Old   April 29, 2012, 01:45
Default UDF Contours
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Varoon
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I have written the following code to display the pressure contour using user define memory.


#include "udf.h"

DEFINE_ON_DEMAND(wall_pressure)

{ face_t f;
Domain *domain=Get_Domain(1);
int ID = 8;

/* Zone ID for wall zone */

Thread *t = Lookup_Thread(domain, ID);

begin_f_loop(f, t)

{

F_UDMI(f,t,0) = F_P(f,t);

Message("pressure %e\n",F_UDMI(f,t,0));

}

end_f_loop(f, t)

}

But the contour displays only zeros, i even tried to replace F_P(f,t) with 300 but i still end up getting the same zero result.

Could you let me know the reason behind the result?
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Old   May 1, 2012, 03:59
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Daniel Tanner
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I think you have to use C_UDMI, F_UDMI does not provide that function.

This was covered on a post some time ago that may be useful.
How to find the cells adjacent to the wall?
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Old   May 1, 2012, 10:09
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Varoon
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Daniel,

Thanks. I was able to figure it out and get the code executed. But i have landed up with another problem.

I am calculating the differential of few parameters with respect to x and y using UDF.

When i use C_T_G(c,t)[0] which is the dT/dx, i get Fluent execution errors. The code is getting compiled but while executing on demand function, i get this error.

I have included mem.h in my code also.

Would it be possible for you to let me know the reason behind it?
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