Reply To: channel3d in olb1.6 and olb1.5
yes, you can simulate your case using only velocity validation.
The indicator is the wall where you want to calculate y+. It would be the cuboid in your case. IndicatorCuboid3D than.
For U+ you need to write a new lattice functor starting with the existing y+ functor.
If you need mor help for your project you can come to our spring school in Heidelberg.