[kamal tewari]

Hi there,

I have a convergent nozzle exhausting to open atmosphere. So i set free streaminlet as boundary condition (M= 0.75 , P=44010,T=283.15K) to inlet of nozzle and modeled a large rectangular space at exit to the nozzle for atmosphere (it is fairly large) and i setup pressure far-field on the rectangle sides with Mach = 0.002 since the atmosphere will be standstill. I used k-omega turbulence model .
When i run the simulation, the results are spurious with no flow or erratic flow.sometimes i even get un-handled exception in Star CCM which i reckoned would be due to mesh so i refined it and ran the simulation again. but to no avail. am i doing something wrong here. can anyone please guide me with the setup for getting accurate results.


Is my Boundary condition wrong or Initioal conditions wrong?