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Old   September 13, 2006, 04:02
Default Mesh Independence and Y +
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Dea all

I would to know about the issues related to mesh indepedence and Y+ .

1. What is relationship between Mesh indepdence and y+

2. First we set the y plus or mesh independence .

3. what should be the strategy for meshing while studying mesh independence

4. What should be the strategy for meshing while studying y+

Thanks in advance
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Old   September 13, 2006, 05:50
Default Re: Mesh Independence and Y +
Ralf Schmidt
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the mesh just passes flow values to the wall function, so u have two different problems!! One is the mesh, if its resolving the gradients well, and the second one is the BL, if the wall function can resolve it well.

The y+ values are set ONLY depending on the wall model you are using. Have a look at section 11.9 of the Fluent manual "Near-Wall Treatments for Wall-Bounded Turbulent Flows".

Independent of the mesh, the y+ values have to fit the values that are given for the wall zone.

For problems with heat transfer or drag coeffizient, it is usefull to do a wall model dependence investigation. Also, for one wall modell (e.g. std.wallfunction - y+ is between 30 and 300) there might be different results for y+ = 30 and 300...

Hope it helps..

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