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Surface roughness parameters

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Old   December 17, 2007, 10:27
Default Surface roughness parameters
Venugopal Bachu
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Hi! I am doing some CFD runs on manifolds - both cast and fabricated. Cast surface is very rough and fabricated is smooth. How do we model this difference in surface roughness? My guess is in Fluent ---> Boundary conditions--->wall-->Momentum---> and specify roughness height and roughness constant. But what values do we specify normally???

Thanks Venu
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