y+, intelligent wall formulation, BL questions about Creo Flow

Hi 

1) Is there an option to select a laminar boundary layer or is everything just modeled using a turbulent BL with k-eps formulation?

yes, in the physics module, just add flow without turbulence, then you don't have turbulence models in the project.

2) Are there other turbulent BL options other than k-eps?

yes, we have k-e and also RNG and realizable k-e, but k-e should fit be a good fit for most of cases. 

3) does the k-eps BL option include an intelligent wall formulation, where the cells in the BL that have a y+ lower than some cutoff value are ignored?

Yes. we already consider y+ range and turbulence BL structure in our wall functions. e.g. log low and sub layers

4) What are some of the levers that I can pull to achieve y+ values in the typically desired range of 13-31?

You can try reduce the surface mesh size and also consider reduce the aspect ratio of the mesh. all those meshing controls can be found in mesher properties. 

Hope this helps!