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periodic boundary condition in LES

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Old   September 4, 2009, 06:36
Default periodic boundary condition in LES
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Maria Torres
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Hey,

I am currently performing LES for turbulent channel flow at a reynolds number of 10935 using FLUENT. I have two questions:

- Can i specify in FLUENT periodic boundary condition in streamwise and spanwise simultaneously ? How can i do this?

-Can I specify the shear stress as wall boundary condiction with the periodic pressure gradient in the streamwise direction?


Thanks in advance
Marķa
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Old   April 9, 2012, 20:28
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Negin Nazarian
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Hi

I was wondering if you found the answer to your first question.

Thanks
Negin
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Old   April 10, 2012, 19:17
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Lucky
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You can do periodic boundary conditions in streamwise and spanwise conditions simultaneously. It is possible, I have done this. It is straightforward. Just make the planes periodic (you need to do this using the TUI, it cannot be done with GUI commands).

I do not think that specifying the wall shear stress is appropriate, especially for LES. You would need to know the local wall shear stress everywhere on the walls and apply that as a boundary condition through UDF (which means you would have to already know what the flow looks like, which means that you have already solved your problem, which means that you do not need to do any LES).
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Old   April 30, 2022, 00:20
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Tom O
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Quote:
Originally Posted by LuckyTran View Post
You can do periodic boundary conditions in streamwise and spanwise conditions simultaneously. It is possible, I have done this. It is straightforward. Just make the planes periodic (you need to do this using the TUI, it cannot be done with GUI commands).

I do not think that specifying the wall shear stress is appropriate, especially for LES. You would need to know the local wall shear stress everywhere on the walls and apply that as a boundary condition through UDF (which means you would have to already know what the flow looks like, which means that you have already solved your problem, which means that you do not need to do any LES).
Hi

I was wondering if you make the planes periodic by using the TUI,can streamwise and spanwise conditions set flow rate or pressure drop respectively?

Thanks in advance
OYYO
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