PotentialFoam boundary conditions-Flow around a sphere
 

Hello everyone,

I started using OpenFoam recently and i have run some simulations with solvers like icoFoam, simpleFoam,rhoSimpleFoam, sonicFoam already.
Anyway i was trying to simulate the flow around a sphere for Reynolds numbers from 10 to 150 max using potentialFoam but i stuck.
In the boundary file (i didnt create it) there are two regions: GEOM(type "wall") and FARFIELD(type "wall").
Both of them are spheres. GEOM is the geometry around of which i want to calculate the flow and is located inside the FARFIELD sphere, which constitutes the wider control area (inlet and outlet).

So my question is what kind of boundary conditions would i need for the velocity and pressure in order to caculate the flow for different Reynolds numbers ? Is a turbulence model necessary for better results ?