Size functions and boundary layer with Gambit 2.2

Ramine

Hi all!

I'm fairly new to CFD and I'm trying to model 3D wings in order to compare their induced drag in function of their shape (racked wing tip, twisted wing, tapered, winglets...)

After spending some time reading the forum, I came to the conclusion that using the Boundary layer tool in Gambit will not work in 3D for a newbie like me and that size function could do the trick.

I'm not sure I need a fine boundary layer for my study as the wing is meant to be a hydrofoil working at low Re (working Re between 300k and 600k).

Anyway, I'm wondering how you guys would mesh these wings. Would you only use size functions? Looks like if I want to have my first few cells in the 30-300y+ region I'm gonna need a lot of cells arround my wing.

I have a fairly limited CPU ressource so max number of cells I'm expecting is arround 800k - 1M.

I'm also thinking of only using the laminar solver in Fluent as the Re is low and I don't think I really need a turbulence model for this comparison study. Would this assumption sound right?

any thoughts or tips I could use for my study?

Thanks in advance,

Ramine