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UDF: How to use Macro C_VOF()

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Old   July 15, 2008, 04:08
Default UDF: How to use Macro C_VOF()
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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;


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



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


So I doubt that the using of the C_VOF has limitation. Could anyone who konws about this? Thank you very much!!
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Old   March 3, 2010, 08:30
MOHSEN Zendehbad
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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.
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Old   March 3, 2010, 09:49
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Why don't create an iso-surface of your vof variable with value 0.5, then there is no need for using an UDF.
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