The application of EARSM & DRSM for sub-sonic vortex flow

A computational method for simulating vortex flow at high angles of attack based on unstructured grid is built using Explicit Algebraic Reynolds Stress Non-Linear Models with Curvature Correction and Differential Reynolds Stress Models. The sharp and medium leading edge of a 65° delta-wing is taken as examples, to verify the validation of EARSM model and DRSM model of simulating the onset, development and breakdown of vortex and complex vortex influence in vortex flow at two typical sub-sonic computational conditions. Two linear turbulence models, SA and BSL are also applied in these computations. A sequence of comparisons and analysis of the flow field and surface pressure aimed at evaluating the accuracy and sensitivity of several turbulence models for complex vortex flow at high angles of attack are made. Research shows that EARSM and DRSM give predictions of development and breakdown of vortex flow better than traditional linear model. An inferior prediction of the evolution of boundary layer is given so as to cause an earlier onset of vortex. Some proper advices of two advanced models are concluded based on numerical computation. Results from the studies are summarized in a collection of lessons learned which may help future high angle of attack computations for vortex flow.