[Obnates]

I'm fairly new to FLUENT and turbulence modeling, so I need some help on a problem.

I'm trying to model a turbulent jet with Re ~ 2*10^4.

I am having problems getting my solution to properly converge, i.e. the centerline velocity is not linearly decaying like I might expect.

My computational domain is as follows:
North side: pressure outlet, 0 gauge pressure
East side: pressure outlet, 0 gauge pressure
South side: Axis
West side: top region is a pressure outlet, 0 gauge pressure; bottom region is a velocity inlet with V = 10 m/s

There is a jet wall separating the top and bottom regions (viewed from the west).

I'm currently using the realizeable k-e with enhanced wall treatment; my grid is more fine near the wall and coarse out in free space.

I may be approaching this entirely wrong -- what would proper boundary conditions be, and which turbulence model would work best?

Thanks.