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Log-law and the first node from the wall

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Old   September 18, 2014, 05:24
Default Log-law and the first node from the wall
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siw
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Hi,

When simulating a wall-bounded flow with the first node inside the log-layer (i.e. 30 < y+ < 300), so that a wall function is used, does this mean that the velocity at this first node (or cell depending on the solver) is calculated by the log-law equation and not by the RANS + turbulence model equations? And it is then at the second node from the wall that uses the RANS + turbulence model with the first node velocity contributing to the answer in the same manner that when using a y+ <1, so that the first node is in the viscous sub-layer, the RANS + turbulence model equations are being used at this location with the no-slip condition wall velocity contributing to the answer?

Thanks
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Old   September 18, 2014, 13:58
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duri
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yes, this is how equations are solved at wall.
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