[IRobin]

Hello,

I would like to create a UDF which sets the porosity value at a fixed value at a given position. I have been struggling with this for the last couple of days but I am still not succesful . That is why I ask you guys, as I hope you might help me a bit further.

So the problem, I have the following UDF written:

#include "udf.h"

DEFINE_PROFILE(PROF_Pm_Zeta,thread,i)
{

cell_t cell;
real x[ND_ND];
real a;

begin_c_loop(cell,thread)
{
if (x[0] > 0.2)
{
a = 0.0;
}
else
{
a = 1.0;
}
C_PROFILE(cell,thread,i) = a;

} end_c_loop(cell,thread) }

I call this UDF in Fluent as: Cell zone conditions -> Porous Zone -> Fluid porosity

Its goal is to set the porosity equal to 0, when the x-value is larger than 0.2m. However, after implementing this in a rather simple test case (1 inlet + 3 outlet boundaries), it seems to not work. The velocity is not affected what so ever. Does any one have an idea why the porosity is not changed as I intended it to do?

Robin