DETACHED EDDY SIMULATION OF AIRCRAFT MASSIVELY SEPARATED FLOWS

摘要

Numerical simulation of aircraft massively separated Flows is always CFD’s difficulty. This paper adopts DES method based on SA turbulence model to simulate and analyze aerodynamic force and flow characteristics of SDM standard model at high angle of attack. It turns out that when the angle of attack is less than 40 degrees, RANS and DES methods for aerodynamic force are similar; while DES method reflects a clear advantage when the angle of attack is greater than 40 degrees. When the model leeward side is massively separated flows, primary vortex which is induced by the strake wing and the main wing separates into many small vortex structure, even induces lateral aerodynamic force which is diametrically opposed compared to RANS calculation method, reflects the complexity of flow when the aircraft is in high angle of attack on the leeward side.