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Rodi August 12, 2007 11:43

Wall roughness height?
Hello everyone!

I wish to model 2D turbulent flow in open channel with K-eps tuburlence model and the standard wall function.The roughness factor n in Chezy formula is 0.025. I dont know exactly what the roughness height is,or i needn't to change the default number 0 ?

Thanks in advance.

chouaib August 13, 2007 03:11

Re: Wall roughness height?
First, you will find the Nukeradse`s roughness corresponding to the your roughness factor n in Chezy. Then, you will find the roughness height and the roughness parameter (that define the roughness in Fluent) corresponding to the Nukeradse`s roughness obtained. For more information: (chapitres 1 @ 6)

Rodi August 13, 2007 06:54

Re: Wall roughness height?
I'm grateful for your help!I'll have a try.

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