bluff body and Y+

justin

Hi,everyone. I am studying wind environment around buildings. The problem is how to easily set the first cells aroud the bluff body to make the y+ at the desirable range (30~60). As the pressure and stress on the surfaces are variable, that means the first cells should be different. Now I used the structured mesh. After convergence, the range of y+ on the suface was from 40 ~ 1000. If I use y+ grid adaption, the range of y+ droped down slowly ( once about half decrease)and every convergence spend a long time.

Do you have any strategies or suggestions?

Thanks in advance Justin