CFD Online Discussion Forums - Flow over a cylinder in STAR-CCM+ and PointWise y+ calculator

At the moment I am modelling a flow over a cylinder in STAR-CCM+ and therefore I need to calculate the prism layer thickness and the amount of prism layers. However, I have some questions and I would really appreciate it if someone could answer them. Thank you in advance!

Mesh

Surface Remesher
Automatic Surface Repair
Trimmed Cell Mesher
Prism Layer Mesher

Model

All y+ Wall Treatment
Constant Density
Gas(Air)
Gradients
K-Omega Turbulence
Reynolds-Averaged Navier-Stokes
Segregated Flow
Solution Interpolation
SST (Menter) K-Omega
Steady
Three-Dimensional
Turbulent
Wall Distance

Questions

1. The Reynolds number is 1.03E5, this results in laminar flow with turbulent wakes. Does this mean I need to define the model as steady & turbulent or implicit unsteady & laminar?

2. When using the K-Omega SST Turbulence Model is it true that I should aim for a y+ value around 1<4? Or should I use a y+>30 for the overal mesh and only a y+ of 1 for local refinements with volumetric control?

3. When using the y+ calculator (PointWise), is the calculated value of the wall spacing delta_s the distance from the wall to the center of the first boundary mesh cell or the height of the first boundary mesh cell(twice as big)?

4. Am I using the y+ calculator correctly for calculating the number of prism layers and the prism layer thickness?
(see inputs & outputs for details)

Inputs

Base size = 0.05 m (as fine as possible but with an acceptable calculation time)
Prism Layer Stretching ratio R = 1.3 (or perhaps 1.5?)
Desired y+ = 1
Wall Spacing delta_s = 1.947E-5 m (calculated with Pointwise y+ calculator)
Desired Prism Layer Thickness T = 0.1 m (double the base size)

Outputs

Number of Prism Layers n_exact = log(T/delta_s)/log(R) = 32,56
Number of Prism Layers n = 33 (I use this number for my STAR-CCM+ automated mesh default control settings)
Prism Layer Thickness = delta_s * R^n = 0,1121 m (I use this number for my STAR-CCM+ automated mesh default control settings)