CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Wall roughness height? (http://www.cfd-online.com/Forums/fluent/45696-wall-roughness-height.html)

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: http://ethesis.inp-toulouse.fr/archi.../01/labiod.pdf (chapitres 1 @ 6)


Rodi August 13, 2007 06:54

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



All times are GMT -4. The time now is 12:56.