normal distance for wall trubulence
 

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

Re: normal distance for wall trubulence
 

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.

Use Boundary Face Geometry:

BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0)
ds will give you the near wall cell distance to the face centroid