# Mesh Independence and Y +

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 September 13, 2006, 04:02 Mesh Independence and Y + #1 sam Guest   Posts: n/a 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

 September 13, 2006, 05:50 Re: Mesh Independence and Y + #2 Ralf Schmidt Guest   Posts: n/a Hi! 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.. Ralf

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