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Regarding the y+ function

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Old   December 23, 2020, 07:15
Default Regarding the y+ function
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Arijit Saha
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Hello everyone, its Ari here and I would like to have some suggestion from any profound CFD enthusiast. As per my theoretical knowledge is concerned with y+ value it is the dimensionless first cell center distance from the wall and it has a fixed value throughout the simulation time. But, when I used y-plus function by specifying it in controlDict it gave me the y-plus values as function of simulation time-steps.
https://www.openfoam.com/documentati...eld-yPlus.html

Can anyone tell me what does that physically means and which value of y-plus value should I consider to have an impression overall ?
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Old   December 29, 2020, 07:14
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Can I suggest that you read up more about what y+ is.

Correct that it's the normalised near wall distance, but not correct that it's a constant. In fact, the normalisation uses the wall shear stress (often expressed as the friction velocity, u*). Can you see now why this might change during the simulation?
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