Mesh Independence and Y +
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
Re: Mesh Independence and Y +
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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