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September 30, 2010, 07:45 |
Definition of y+ in yPlusRAS (1.7.1)
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#1 |
New Member
anonymous
Join Date: Sep 2010
Posts: 3
Rep Power: 15 |
I have computed flow around a spheroid using simpleFoam(1.7.1) and Fluent using k-omega-SST model and an identical mesh.
The results were very similar except that value of y+ computed by yPlusRAS is much smaller than that in Fluent. Only the value is different and the pattern of the distribution was similar. So it looked as if the y+ value in Foam was multiplied by a factor. I also confirmed that the magnitude of the wall shear stress is almost the same in Foam and Fluent. The height of the cell next to the wall is 5e-6, and the value of wall distance at the cell center is 2.5e-6. The magnitude of wall shear stress at a point is 4.6e-3, rho is 1, and nu is 2.38e-7. Then, I suppose the value of y+ is y+ = 2.5e-6 * sqrt (4.6e-3) / 2.38e-7 = 0.7 Fluent gives this value, but Foam gives 0.04. I wonder if the definition of y+ is not this way in Foam. I appreciate any suggestion or comment. Thank you for reading. Regards |
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Tags |
komegasst, openfoam 1.7.1, simplefoam, yplusras |
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