[zhixin]

Hi all,
I'm doing some simulation using species transport model(no reaction) and k-e model, and I need to calculate some variation using udf. Here is the formula I used: the mass fraction of o2 in the cell near the wall(mass_frac) to divide the distance of the centroid of the first layer (dist). Here is the part I plan to use to calculate in fluent.

real CR;
real dist;
real mass_frac;
cell_t c;
thread_loop_c(t,d)
{
if(THREAD_ID(t)==36)//elbow ID
{
begin_c_loop(c,t)
mass_frac=C_YI(c,t,0);//mass fraction of o2
dist=C_WALL_DIST(c,t);//centroid of first layer
CR=mass_frac/dist;
end_c_loop(c,t)
}
}

but I don't know which macros to use even if I looked up the help document. And I also wander how can I do to display the contour of CR.

Anyone can give me some advice?
Thanks.