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can anyone please give me detailed answer about the purpose and change of y+ and y* |
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May 18, 2016, 03:17 |
can anyone please give me detailed answer about the purpose and change of y+ and y*
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#1 |
New Member
sanjeev kumar.m
Join Date: May 2016
Posts: 13
Rep Power: 10 |
Hi scholars,
please tell me whats the need and purpose of refining the mesh and changing the values of y+ in turbulence flow model. what is the limits of y+ for general and different problems,and how to calculate the value of y+ for different problems based on flow models. finally, what is the purpose of Y* thank you , |
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May 19, 2016, 00:27 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,756
Rep Power: 66 |
y* and y+ are both inner variables but use slightly different velocity scales for the inner velocity.
Depending on the model, the near-wall turbulence models used need a certain y+ or y*. Hence, your mesh should be fine or coarse enough to meet that criteria. These criteria depend entirely on your models you select (whether explicitly or implicitly). |
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May 24, 2016, 06:58 |
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#3 |
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Sverige
Join Date: May 2016
Posts: 2
Rep Power: 0 |
Y+ is calculated from the shear stress at the wall and can therefor be zero in some cases like stagnation and separation point. That's why there are a y* which is calculated from kinetic energy instead.
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