[lotheg]

Hello,

I want to count the heat exchange in the nozzle of turbojet engine. I've created a model of this engine and I used following settings:
http://wrzucaj.net/tHj
This is only 1/4 of model.

Solver: density-based
Energy: ON
Viscous: standard k-E
Air: Ideal-gas
Boundary conditions:
- pressure inlet: gauge pressure=203990.4 Pa and Temp=1000 K, operating conditions -> pressure=0 Pa
- pressure outlet: gauge pressure=472655.75 Pa and temp=890 K
- symmetry for every wall 'inside'
- wall for outer surface: convection with heat transfer coefficient 58 w/m2-k , free stream temperature=220 K and wall thickness=1 mm

Reference values: compute from: pressure inlet
Flux type: AUSM
Solution Initialization: compute from: pressure inlet


What do you think about that? I've had some troubles and errors like 'backflow' , "time step reduced...' , divergence...