[pchoopanya]

Dear all,

I am modelling a 3D model of a compressor blade cascade. (7 blades in a row).

I experimented on 3 Turbulent models; Spalart-Allmaras, k-epsilon, and k-omega

The y+ values on the surface of the blades are of prime importance. So I checked the results using contour plot of a y+ on the blade surfaces. The findings are as follows;

SA: max y+ is around 8
k-e and k-w : y+ stay between 0-2

My question is why? The mesh and all other settings are unchanged, I only switched between different 3 turbulent models. How could the y+ values be different? From my understanding there is only one equation for y+ which relates the velocity, the distance from the wall to the adjacent cell, etc.

Could you please suggest?