[minikuboo]

Hello everyone!!
I am trying to solve an S-shaped duct which I designed, it is a kind a airial target (not real plane, just model)
And I have a trouble to simulate outgoing flow, as a boundary condition of calculating domene is a pressure-farfield in shape of ball with diameter 10 times bigger than the bigest dimension of the plane. and tha face of engine from where I want to tate out the air is as pressure-outlet there is defined target mass flow 1.888 kg/s and pressure 101325 Pa.
I want to simulate and obtain pressure loos in whole range of possible flying condition including staic condition (airplane is steady and engine is running)
in my first case the pressure-farfield was set up on M=0 and pressure 1013 temperature 101325.
and immediately like I started computing it was diverting or some warnings was plotted.
I am really desperate

I will try conect a picture latter

[minikuboo]

here it is:
on picture we can see plane with duct yellow is like wall, blue is pressure outlet, and red is pressure-farfield, no else boundary condition are used. Picture is simple there missing some surfaces as a other half and also the tip of airplane and the end of airplane