[alains]

Hello everybody, I'm programming an UDF to calculate heat transfer coefficient but my UDF can't read thermal conductivity with C_K_L, what's wrong, please?


DEFINE_PROFILE(htc_1, thread, position)
{
face_t f;
cell_t c;

real lambda, rho, mu, cp;

begin_f_loop(f, thread)
{
lambda = C_K_L(c,thread);
rho = C_R(c,thread);
mu = C_MU_L(c,thread);
cp = C_CP(c,thread);
x_vel = C_U(c, thread);

F_PROFILE(f, thread, position) = 0.36 * lambda * (2 + pow(cp * mu / lambda,1 / 3) * x_vel)

}
end_f_loop(f, thread)

}

[pakk]

The problem: you are looping over faces ("begin_f_loop"), and then trying to access cells ("lambda = C_K_L(c,thread)").
Fluent does not know which cell you are talking about.

You probably mean the neighboring cell: F_C0(f,t)

So the code would be:

lambda = C_K_L(F_C0(f,t),thread)

And do this for all cell references.

[alains]

Oh, thanks pakk. I'll try it and then I tell you; I tried to do similar to the UDF User.