yplus accommodetion for pisoFoam in LES wall model

I'm doing LES model, but don't want to cost too much time on the first calculating, so I select the wall function, now it works normally, but I don't know how to choose a suitable wallfunction for my case and how to see whether the calculation is correct according to the yplus from each interaction.

I choose kqRwallFunction for k, nutUspaldingWallFunction and nutkWallFunction for nut, kEqn and Smagorinsky for LES model, so there are four cases now, and all of them are calculating now.

would any suggestion about my cases is welcome, thank you