# how to use VOF with a free surface?

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 February 1, 2011, 15:09 how to use VOF with a free surface? #1 Member   daalou Join Date: Feb 2011 Posts: 31 Rep Power: 7 hello; i am working on Taylor Couette system, it's two concentric cylindres with the inner is rotating, the gap between the two cylindres is not full of fluide-benzene-, it means there are two phases air and benzene with free surface (between the two phases. using VOF, i always find one phase (benzene) as a result in the gap, please help me.

February 2, 2011, 22:14
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Are you initializing your solution with only one phase (volume frac of benzene=1)? If not, is there a way for air to leave the system and benzene to enter?

ComputerGuy

Quote:
 Originally Posted by alilouu hello; i am working on Taylor Couette system, it's two concentric cylindres with the inner is rotating, the gap between the two cylindres is not full of fluide-benzene-, it means there are two phases air and benzene with free surface (between the two phases. using VOF, i always find one phase (benzene) as a result in the gap, please help me.

 February 3, 2011, 16:44 #3 Member   daalou Join Date: Feb 2011 Posts: 31 Rep Power: 7 thanks for intersting computerGuy, there is no velicity inlet for each phases, it means the only move is the rotation of the inner cylinder. the the volume fraction of air is 0.53 bigboss.abhishek likes this.

February 3, 2011, 16:56
vof ??
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daalou
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thanks computerGuy
i initiallsed the calcul with two volume fractions; 0.53 for air, and 0.47 for benzene, but in the end , i find only one phase, there is no motion (velocity inlet) for each phases, only the inner cylinder which is rotating
like is shown in the picture;
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 T 11.jpg (64.7 KB, 26 views)

 March 22, 2011, 13:37 simulating Taylor Couette problem #5 Member   daalou Join Date: Feb 2011 Posts: 31 Rep Power: 7 hi ; is there someone hwo knows sources about simulating a free surface in the taylor couette problem........ really i found only the work of watanabe et al. thanks a lot

November 15, 2011, 03:55
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Quote:
 Originally Posted by alilouu thanks for intersting computerGuy, there is no velicity inlet for each phases, it means the only move is the rotation of the inner cylinder. the the volume fraction of air is 0.53
are you taking a co current case or a counter current case....

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