neighboring cell in VOF model

stulle · December 19, 2010, 17:20

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 · January 5, 2011, 10:27

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.

December 19, 2010, 17:20	neighboring cell in VOF model	#1
stulle New Member Join Date: Oct 2010 Posts: 4 Rep Power: 16	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

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January 5, 2011, 10:27		#2
fluentuser1 New Member Joey Join Date: Jan 2011 Posts: 6 Rep Power: 15	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.