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Old   August 12, 2007, 11:43
Default Wall roughness height?
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Rodi
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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.
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Old   August 13, 2007, 03:11
Default Re: Wall roughness height?
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chouaib
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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: http://ethesis.inp-toulouse.fr/archi.../01/labiod.pdf (chapitres 1 @ 6)

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Old   August 13, 2007, 06:54
Default Re: Wall roughness height?
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Rodi
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I'm grateful for your help!I'll have a try.

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