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-   -   help udf !!!! (https://www.cfd-online.com/Forums/fluent/41780-help-udf.html)

woo July 19, 2006 08:50

help udf !!!!
 
Hi!

i ran a steady flow simulation in Fluent. i know the distribution of the velocity in the domain,including the velocity inlet. That is a full development velocity in a rectangle pipe. so i want to use udf to specify the velocity distribution.

i used DEFINE_ADJUST . the interpret was ok. But iteration had a problem. Error: Floating point error: invalid number

Error Object: ()

codes are below:

#include "udf.h" DEFINE_ADJUST(adjust_velocity, domain) { real x[ND_ND];

real y;

real z; Thread *t; cell_t c; face_t f; thread_loop_c (t,domain)

{

begin_c_loop (c,t)

{

C_CENTROID(x,f,t);

y= x[1];

z= x[2];

C_U(c,t)=0.04025*pow(1.455,2)*(1-pow(y,2.2)*pow(100,2.2))*(1-pow(z,2.2)*pow(100,2.2));

}

end_c_loop (c,t)

}

}

Can anyone help? Thanks in advance Woo


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