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normal distance for wall trubulence

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Old   July 10, 2005, 15:21
Default normal distance for wall trubulence
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In low-reynolds-number models, the normal distance to the wall is used in determining the "damping" functions.

For one-dimensional flow, it is easy to identify this parameter; However, for two/three-dimensional corner flows, how to determine this wall distance?

thanks a lot
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Old   July 12, 2005, 04:19
Default Re: normal distance for wall trubulence
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The following method is what CFX-5.6 is doing.

D^2(F)=1. where D^2 is Laplacian operator.

Wall Distance=sqrt((abs(grad(F))^2+2F)-abs(grad(f)))

Above is given in CFX-5.6 Sover Theory, page 71.

If you have difficulties in reading above equations, email to me.
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Old   August 13, 2017, 15:55
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Use Boundary Face Geometry:

ds will give you the near wall cell distance to the face centroid
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