How to use a variable sand roughness height in wall boundary?? -- CFD Online Discussion Forums

September 28, 2011, 11:01	How to use a variable sand roughness height in wall boundary?? Help me Please.... :(	#1
Kelly New Member Raquel Faria Join Date: Sep 2011 Posts: 2 Rep Power: 0	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?? Thanks 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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