UDF Contours

varoons · April 29, 2012, 02:45

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?

Daniel Tanner · May 1, 2012, 04:59

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.
http://www.cfd-online.com/Forums/flu...cent-wall.html

varoons · May 1, 2012, 11:09

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?

April 29, 2012, 02:45	UDF Contours	#1
varoons New Member Varoon Join Date: Apr 2012 Posts: 3 Rep Power: 14	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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May 1, 2012, 04:59		#2
Daniel Tanner Member Daniel Tanner Join Date: Apr 2009 Posts: 54 Rep Power: 18	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. http://www.cfd-online.com/Forums/flu...cent-wall.html

May 1, 2012, 11:09		#3
varoons New Member Varoon Join Date: Apr 2012 Posts: 3 Rep Power: 14	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?