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-   -   how to use VOF with a free surface? (http://www.cfd-online.com/Forums/fluent/84527-how-use-vof-free-surface.html)

alilouu February 1, 2011 15:09

how to use VOF with a free surface?
 
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.
http://www.cfd-online.com/Forums/ima...ser_online.gif

ComputerGuy February 2, 2011 22:14

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 (Post 293145)
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.
http://www.cfd-online.com/Forums/ima...ser_online.gif


alilouu February 3, 2011 16:44

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

alilouu February 3, 2011 16:56

vof ??
 
1 Attachment(s)
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;

alilouu March 22, 2011 13:37

simulating Taylor Couette problem
 
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

bigboss.abhishek November 15, 2011 03:55

Quote:

Originally Posted by alilouu (Post 293525)
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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