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friction lengthscale

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Old   June 18, 2020, 06:01
Default friction lengthscale
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Hi,

As I know that the turbulent models or wall functions can solve the fully rough (s/deltav >>1) or fully smooth(s/deltav <<1) surfaces. Hence, to know whether my case is fully rough or fully smooth, I need to determine the ratio (s/deltav). So, how can I determine the friction lengthscale (deltav)?

where "s" is the roughness
"deltav" is the friction lengthscale.

Issa

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