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moitoring plane to UDF

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Old   March 27, 2007, 05:16
Default moitoring plane to UDF
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James
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Hi All,

We are trying to loop over a plane at every time step to determine the maximum pressure in the plane. This maximum pressure will then be used as an input into our UDF. Is it possible to use the monitor plane capability in Fluent to do this? Our trouble is how to transfer the data written my monitor at every time step to the UDF. Any assistance or suggestion will be highly appreciated.

Thanks.

James

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Old   January 29, 2013, 15:41
Default p on a plane
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Nick Cleveland
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I am trying to do the same thing. I need the average pressure at an interior plane I specified. The problem is it seems like I have to give the UDF the structure name of the data on the plane for it to understand it.

It may be going against nature of Fluent, but is there a way to get average pressure on an internal plane? I need ave pressure to use in the UDF to adjust velocity inlet speed.

#include"udf.h"
DEFINE_PROFILE(unsteady_velocity, thread, position) /*line 9*/
{
Thread *t;
face_t f;
real pave;
real A;
real time;
real pfac;
real time_step;
time = CURRENT_TIME;
/*compute average pressure at inlet*/
pave = 0.0;
begin_f_loop(f,t)
/* line 21 has structure/union error: doesn't refer to strucure or union*/
{

pave += F_P(f,time)/F_NNODES(plane 14,f,t);
/* line 25 gets average pressure in plane, but struc/union error here too*/

}
end_f_loop(f,time)
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