[Taka1]

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