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UDF compute residence time session Id 619

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Old   April 5, 2009, 11:13
Default UDF compute residence time session Id 619
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lisa
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Hi..

I am looking for UDF to compute residence time with the session ID 619. Can anyone post the code when u have.

Thanks in advance
Sesan.
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Old   April 6, 2009, 06:31
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Max
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Here it is:

#include "udf.h"

/*
* UDF to compute fluid residence time
*
* by William Wangard, Ph.D.
* Fluent, Inc.
*
*/

/*
* This UDF requires at least 1 UDS to be defined
* At inlet, define UDS (value) = 0
* UDS will have units of time and represent approximate residence time
* of fluid in domain
*
* Diffusivity of scalar should be small to reduce diffusion i.e. 1E-5
*
*/


DEFINE_SOURCE(rt_source,c,t,dS,eqn)
{
real source = C_R(c,t);
dS[eqn] = 0.0;
return source;
}

cheers
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