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How to decide the boundary condition for free surface? |
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February 5, 2011, 22:29 |
How to decide the boundary condition for free surface?
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#1 |
New Member
Join Date: Feb 2010
Posts: 12
Rep Power: 16 |
Hi
I know that at the bottom we can use the wall function to determine the BC for turbulent kinetic energy k and dissipation e. So how about the free surface? Does the wall function still apply to free surface or we can use something else? Thank you in advance |
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February 6, 2011, 03:10 |
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#2 |
Member
Mohammad Reza Hadian
Join Date: Mar 2009
Location: Yazd, Iran
Posts: 52
Rep Power: 17 |
at the free surface the velocity vector normal to the free surface is zero and the zero gradient is applied for tangential velocity vector.
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February 6, 2011, 19:10 |
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#3 |
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Thank you for your explainnation.
I know how to set velocity at the free surface. I mean, at present i used k-e model to simulate the turbulence. I want to know how to set k and e at the free surface. |
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February 7, 2011, 01:50 |
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#4 |
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Mohammad Reza Hadian
Join Date: Mar 2009
Location: Yazd, Iran
Posts: 52
Rep Power: 17 |
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February 7, 2011, 02:16 |
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#5 |
New Member
Join Date: Feb 2010
Posts: 12
Rep Power: 16 |
I have got it
Thank you again |
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February 16, 2011, 07:48 |
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#6 |
New Member
Gillian
Join Date: Sep 2010
Posts: 15
Rep Power: 16 |
Hi...
I am a bit confused about how to specify boundary condition for the top surface. I have seen many ppl set the surface as symmetry. I am wondering when such boundary condition can be applied and when do we need to use other types of boundary conditions? Specifically, if we are modeling the flow crossing a weir, what type of boundary condition should I specify for the top surface (both in front and after the weir)... Thanks! |
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