Hi every one . I want to define the turbulent viscosity then i define this code. It can interpreting but it cannot iterate. Please someone help me #include "udf.h"

DEFINE_TURBULENT_VISCOSITY(user_mu_t, c, t)

{ real mu_t; //TURBULENTVISCOSITY

real p = C_R(c,t); //density

real k = C_K(c,t); //Turbulent kinetic energy(k)

real e = C_D(c,t); //Dissipation rate (epsilon)

real Ret; //Turbulent Reynolds number

real u = C_MU_L(c,t); //laminar viscosity

real v;

real fmu; //Damping function

real cmu = 0.09;

v=u/p; //Kinenatic viscosity

Ret=k*k/(e*v);

fmu= exp(-6.0/((1.0+(Ret/50.0))*(1.0+(Ret/50.0))))*(1.0+(3.0*exp(-Ret/10.0))); //Damping function

mu_t =cmu*fmu*k*k/e;

return mu_t;

}

Best regard

I tested your code. It works well in my system. Windows XP, Fluent 6.1.22 and 6.2.16, 3-D geometry Both Intepreted and Compiled

thank you very much Zhang. I used Fluent 6.1.22 with Win XP. This code Intepreted and Compiled but when I iterate the problem ( Channel Flow 2D) it is error. Thank you

Did you hook this UDF?