# Hi I need to calculate Y+ value for jet Impingement over flat plate

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June 9, 2023, 02:25
Hi I need to calculate Y+ value for jet Impingement over flat plate
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G. Nithyanandham
Join Date: May 2023
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Last edited by Nithyanandham; June 9, 2023 at 02:27. Reason: Image was not added

 June 9, 2023, 13:49 #2 Senior Member     Kareem Join Date: Nov 2022 Location: New York Posts: 115 Rep Power: 3 Y+ is dependent on the shear stress at the wall which is in turn dependent on the velocity. For an impinging jet on a flat surface, your velocity will be 0 at the stagnation point, hit a maximum a few units out, and then taper off as the jet spreads over the plate. If your first cell height, delta Y, is consistent along the impingement surface then your Y+ will match the velocity. To confirm this you can plot a graph of the velocity over the same distance and you will see a similar curve. You should use the maximum value of Y+ for you inquiry. Depending on the wall condition/solver you will want the Y+ number to be <1 everywhere in domain. The regions where Y+ is >1 may not be accurate. There is no need to use some different formulation of Y+. The phenomena you are seeing is correct and is not due to the calculation of Y+. Nithyanandham likes this. __________________ Please like the answer if it helped! Video Tutorials and Tips: https://www.youtube.com/@cfdkareem/featured

 June 12, 2023, 00:42 #3 New Member   G. Nithyanandham Join Date: May 2023 Posts: 4 Rep Power: 2 Thank you for your response.

 Tags jet impingement, sst komega, y+ calculation