[akm]

I'm trying to modify the default k-eps turbulence model in Fluent using udfs, and i wanted to set the boundary conditions as per my requirement.

Now the Fluent manual says that it "takes care of the wall boundary conditions for k(turbulent kinetic energy) and epsilon (energy dissipation rate) at the wall", but is there any way i can change the B.C. conditions of epsilon on the wall using a udf?

[Amir]

Hi,

The general idea is to use 2 UDS for k and e; consequently, you can set appropriate BCs on these scalars.

Bests,

[moun139]

i try to intoduce this UDF ,but it return me eror line 18 :invalid type for pointer dereference: double. ; what is the problem?

#include "udf.h"

#define A 0.1;
#define B 0.01;

DEFINE_PROFILE(frac,t,i)
{
real ma=0.002;
real grad=0.002;
cell_t c;
face_t f;

begin_f_loop(f,t)
{

grad=C_YI_G(c,t,i)[1];

ma=A-B*grad;
}
end_f_loop(f,t)
}