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Which yplus (Max,ave,volumeAve?) value do I need from CFD Post

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Old   July 4, 2017, 07:28
Default Which yplus (Max,ave,volumeAve?) value do I need from CFD Post
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I want to determine the y+ value from the simulation of a T-junction pipe in Ansys Post. When I plot the y+ value it ranges from 0 to 10, because there are some local regions where the y+ value is high. To solve this problem, I tried to refine these regions in ICEM further like I read in a previous post here but it led to bad elements and to a higher aspect ratio (>200). The first cell height is curretly 0.03 mm and the aspect ratio 167. I want to get a y+ < 5 for an LES-Simulation. My question is: Is the maximal y+ value (10) more relevant or can I just consider either the average (ave) of y+ on the Wall or the Volume average (volumeAve) of y+ on the domain, which are both < 5 as the y+ value that I need. I am not sure which y+ value I need. Thx in advance for your help.
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Old   July 6, 2017, 06:57
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Then why not try a range of y+ values and find out whether you are sensitive to it or not? Rather than guess, test it out and find the real answer.
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