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Solve Flow or VOF simultaneously ?

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Old   February 16, 2011, 09:19
Default Solve Flow or VOF simultaneously ?
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Ramsey
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Dear Fluent user ,
I am modelling 2phases (gas jet+water) VOF Model, I have two "Velocity Inlet" Boundary conditions, one for the gas phase and the other for water..
I Need to know If i should first solve only gas flow (in solve control solution) until i get convergence, then I switch solve VOF , Or solve Flow and VOF simultaneously...? In this case it is very difficult to get convergence..
Thanks
Fred
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Old   February 16, 2011, 14:16
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Khalid Baker
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Quote:
Originally Posted by Ramsey View Post
Dear Fluent user ,
I am modelling 2phases (gas jet+water) VOF Model, I have two "Velocity Inlet" Boundary conditions, one for the gas phase and the other for water..
I Need to know If i should first solve only gas flow (in solve control solution) until i get convergence, then I switch solve VOF , Or solve Flow and VOF simultaneously...? In this case it is very difficult to get convergence..
Thanks
Fred
If you switch off VOF in solution control i think you stopped the whole VOF model because the vof equations not be solved hence you need to select the vof equation in control solution. About convergence start with small time steps untill your solution be stable and use small descrtization factors hope this work well with you.

Regards
kbaker
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