UDF: How to use Macro C_VOF()
 

Hi, every one:

I have defined a 2D immiscible liquid-liquid flow flied in a square box. I used the VOF model. I wanna identify the interface between the two liquids, so I used the following code to identify the interface:

cell_t c; Thread *t;

begin_c_loop(c,t) {

real vof;

vof=C_VOF(c,t);

if (vof>0.&& vof<1.)

{

}

However, when the UDF load to the fluent and iterating, there were errors

ACESS_VIOLATION

So I doubt that the using of the C_VOF has limitation. Could anyone who konws about this? Thank you very much!!

you should first access the sub thread related to that phase, you should put that thread as an input of your C_VOF(), find the function THREAD_SUB_THREADS() in fluent documentation.

Why don't create an iso-surface of your vof variable with value 0.5, then there is no need for using an UDF.