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wall roughness

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Old   June 23, 2015, 11:12
Default wall roughness
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Ronald Thompson
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I want to model the effect wall roughness has on slowing down the flow for a model I'm running, I was hoping someone could clarify the wall roughness boundary conditions box for me.

my understanding is;
roughness height is the same as absolute roughness value found in places like the engineering toolbox and roughness constant between 0.5-1 indicates how uniform the roughness particles are, with 0.5 being uniform and 1 not being uniform at all.

Is this correct?

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fluent 14.5, roughness height, roughness value, wall boundary condition

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