COMPARISON AMONGST DIFFERENT SHEAR-STRESS TRANSPORT MODELS IN SIMULATING THE FLOW FIELD OVER A SLENDER BODY

The subsonic vortical flow field over a slender body at a large angle of attack was simulated using SST (Shear-Stress Transport) k-ω, SST-DES, SST-SAS turbulence models. The aerodynamic characteristics of the vortical flow were investigated. By comparing the force along the length of the slender body, surface pressure, eddy viscosity, grid suitability and the forecast of the flow field, it is concluded that under same conditions the simulation results at the rear of the slender body differ significantly amongst the three models. The SAS model is more capable in predicting the flow field, especially small-scale vortices and the unsteady characteristics of tail vortices. The eddy viscosities of the three models along the same cross-section are of the same level of magnitude, with the relation being SAS