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Roughness height and Y+ and y

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Old   June 24, 2013, 00:57
Default Roughness height and Y+ and y
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Hello

I am modeling a concrete channel by Fluent.
What is Roughness height and Y+ and y in defining concrete channel?
I am confused what they are? I read all thread about thats but i don't know what they are.
Is the Roughness height exactly the height found on standard charts (http://www.engineeringtoolbox.com/su...cts-d_209.html)

thanks
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