[ayoung94]

Hi, I am relatively inexperienced in Fluent and need help with identifying correct BCs to use at the inlet and outlet, for the given flow properties.

The case is a 3D model of the RAE M2129 S-duct. The conditions are (from AGARD AR-270) :

P_t = 101215.771 Pa
T_t = 293 K
M_flight = 0.210
M_throat = 0.412
Non-dimensional weight flow = .197 in^2 K^0.5 s^-1

M_compressor face = 0.304
Pressure recovery = 0.9897

I am currently modelling just from the bellmouth intake (0.1294m ahead of the throat - assumed straight section purely for boundary layer growth) to the engine face.

I have set the fluid to Ideal Gas, as the flow is compressible for M=0.412. I think I want to specify this velocity at the inlet, but cannot use velocity-inlet as that is for incompressible flow models only.

I have tried understanding the Fluent guide re. BCs online, and looked around for solutions, but have not found any.

Any advice would be welcomed, thanks.
Alex