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significance of y+ value

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Old   March 22, 2008, 03:57
Default significance of y+ value
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jai
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what is the use of y+ value and where can i find the details for their use in cfd analysis?
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Old   March 23, 2008, 15:56
Default Re: significance of y+ value
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Dave S
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An extensive explanation is given in the Fluent help files. Essentially y+ is used in looking at the boundary layer and the validity of the different ways the flow near the wall is handled. If the y+ is very low, circa 1, then near wall functions can be used, along with a low Re turbulence model. Upto approx 300 then standard wall functions can be used. Above this then resolution near the wall drops off. However if you are only interested in the bulk flow characteristics then this will not be significant.
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Old   October 28, 2015, 18:57
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Benoskyy is on a distinguished road
What is best empirical formula for calculating shear velocity in a channel flow?
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