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-   -   problem with VOF model (http://www.cfd-online.com/Forums/fluent/49264-problem-vof-model.html)

vuthuan September 15, 2008 21:34

problem with VOF model
 
I have a problem in simulating of wave generation in a tank. I use 2D mesh, VOF model, inviscid fluid and used UDF to make one end as sinusoidal movement. I don't know why I can not see the wave propagate to the other end of the tank (It just propagate about 1.5m (wave length is 0.5m) then disappear) even I had extented the enough calculating time (I manually estimated group velocity, knowned-tank length). Could anybody explain me why? Thank in advance


Davy September 17, 2008 20:45

Re: problem with VOF model
 
I think your mesh must be fine enough to capture the wave motion accurately and to avoid numerical diffusion. Especially, along the wave height the discretization cannot be too coarse.


Davy September 17, 2008 20:47

Re: problem with VOF model
 
I think your mesh must be fine enough to capture the wave motion accurately and to avoid numerical diffusion. Especially, along the wave height the discretization cannot be too coarse.


vuthuan September 19, 2008 21:42

Re: problem with VOF model
 
Thank you, I have already refined my mesh and used 2nd-order. The result shows better.

vuthuan September 30, 2008 22:58

2nd problem with VOF model
 
I try to simulate free surface with wave generation but I don't know how to choose boundary condition to simulate radiation condition. I mean the wave will progress infinitely. I had tried to use flow out and pressure out but the result is not satisfied. Could anybody please to help me about this problem?

Thanks,


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