UDF to modify the value of a user defined scalar

Raja Banerjee

Hi, I have a two-phase flow between two parallel plates. I am using VOF model to simulate the flow. I have introduced a user defined scalar and trying to assign a value to the scalar at the interface. I am finding the interface by determining the cells which have the liquid volume fraction between 0 and 1. I am using DEFINE_ADJUST macro as I want it to be done every iteration. But it is not assigning the scalar value at the interface. I am provding here the code which I have written:

#include "udf.h" #include "sg_mphase.h"

DEFINE_ADJUST(vol_frac_find, domain) {

Thread *t=Lookup_Thread(domain,8);

cell_t c;

begin_c_loop(c,t)

{

if(C_VOF(c,t,1)>0. && C_VOF(c,t,1)<1.)

C_UDSI(c,t,0)=0.0228;

}

end_c_loop(c,t);

}

I would appreciate, if someone can point out my mistake.

The id that I have used in the Lookup_Thread function corresponds to the zone- default-interior in the boundary conditions dialog-box.

Thanks Raja Banerjee