y+ for NACA0012 transonic simulations

Oscar Arias

Hi,

I'm doing bidimensional transonic simulations over the NACA 0012 using a structured O-grid. My Euler results are good, so I start my full Navier-Stokes simulation from the Euler result using the Baldwin & Lomax model. The final result is not bad, but the y+ for j=2 is too high(from 1 to 25), and theoretically there are no grid points on the viscous sublayer(that is, y+ less than 5).

I start by decreasing the j=2 distance to 0.000003 (based on airfoil chord of 1), but the y+ values are still very high.

-What are the normal grid distances from the wall to j=2 for these type of simulations? -Is there any way to reduced the y+ values without changing the flow properties? (Standard sea level temp and pressure)

Thanks for your suggestions!