Boundary conditions for an axisymmetric round jet
 

hello all , i am new to the use of Fluent so am running a basic case of an axisymmetric round jet. I am getting comparable results for velocity with the literature but the turbulent kinetic energy graphs shows a starneg trend. It first drops for a small distance and then it increases but the increases is very slow. I am worried that i might have put in wrong BC
so my velocity at inlet is 50m/s, here am a bit unsure that what conditions tow give for turbulence i mean what field to choose so i chose turbulence intensity & hydraulic diameter and gave an estimated quantity of 5%
the rest of the region on velocity inlet side is a co flow region with a vel of 0.2m/s
pressure is 0 gauge pressure and no slip walls...
can somebody please suggest as i know it wouldnt be a pb for an expert user.
Thanks:confused::confused: