[stulle]

hello,

i´m modelling a two phase flow with a mixture phase (water_vapor+air) and a water phase.
on the interface between the two phases there is one cell with volume fraction between 0 and 1, let´s say 0.5.
i want to access the cell which is next to the cell with volume fraction 0.5, this cell has volume fraction 0.

CELL A:water(C_VOF=1)|CELL B:C_VOF=0.5|CELL C:mix_phase(C_VOF=0)

how can i solve my problem by using an udf ?
like :
if(C_VOF(c,water)<1)
calculate something in CELL B
and
calculate something in CELL C

i know there are some macros like F_C0 and F_C1, but i don´t know how to use them in a multiphase problem...

thanks for your help or suggestions

[fluentuser1]

I think you could loop all the cells to find the the surface cell. And then you can test the cells around the surface cell.