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How to use a variable sand roughness height in wall boundary??

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Old   September 28, 2011, 11:01
Exclamation How to use a variable sand roughness height in wall boundary?? Help me Please.... :(
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Raquel Faria
Join Date: Sep 2011
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Hi there,

I made some simulations in CFX with the Boundary Condition Wall Non-Slip with a constant value of sand grain roughness. Now, i need to make this value vary with the friction velocity, so I have to introduce the equation in the boundary condition, in order, to get this value in each iteration and actualize the k0 value.

Can anyone tell me how can I do this??


P.S: I apologize for my English, but I'm Portuguese!

Last edited by Kelly; September 28, 2011 at 13:54.
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