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[ANSYS Meshing] Turbulent flow, no zero velocity at wall.

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Old   October 17, 2016, 20:44
Default Turbulent flow, no zero velocity at wall.
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skywalker
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Hello all,
I have been running a turbulent flow problem. The output velocity profile however, doesn't show zero velocity at walls!.
Dimension D=0.02m, L=10m
I am using an FLT of 1e-7m, 25 layers and 1.24 growthrate.
circumfrential element size is 1e-3m and sweep size is 0.026m.

I have written a matlab m file and produced the correct velocity profile for this problem using viscous boundary layer y+=u+ for y+<5 and a standard log law for the rest of the flow. I found out that the viscous sublayer (y+=5) is about 1.4e-4 m.

The aspect ratio for the thin elements near the wall are 260 K! which is bothering me but not much that I can do about it. I thought I should run double precision, but the U-mom and V-mom solution fail (F).

Please help me.
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element quality, meshing 3d, turbulent boundary layer

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