Reynolds-Stress Model Flow Prediction in Aircraft-Engine Intake Double-S-Shaped Duct

The purpose of the present paper is to assess the predictive capability of Reynolds-averaged Navier–Stokes computations using seven-equation Reynolds-stress model wall-normal-free closures for flows in aircraft-engine intake double-S-duct configurations. The intake studied operates at high subsonic Mach numbers and is characterized by high turning angle of the second S-leg, inducing a particularly complex flow structure up to the engine face. Computations were run using two wall-topology-free second-moment closures and a baseline twoequation model, carefully checked for grid convergence, and compared with available experimental measurements. Computational data were then used to analyze the flowfield structure. I.