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Pipe Roughness in Laminar Flow

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Old   October 7, 2005, 02:32
Default Pipe Roughness in Laminar Flow
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Hi All,

How can I model roughness effects in laminar flow conditions? Any advice is greatly appreciated.

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Old   October 7, 2005, 09:40
Default Re: Pipe Roughness in Laminar Flow
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In IDEAS ESC there is a straight forward option by the name "Surface Roughness" andso exit velocity is a function of this parameter - I have seen the effects well in a pipe flow, it would obey darcy's equation very well - turbulence models need to be good (like RNG(Fluent), SST (CFX)) to predict the effect in turbulent region I think.

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