SCALE ADAPTIVE SIMULATION BASED ON A K-KL TWO-EQUATION TURBULENCE MODEL

The two-equation k-kL turbulence model is based on the transportation equations of turbulent kinetic energy and the integral scale. It is characterized by the capacity of the scale-adaptive simulation, and thus the satisfactory prediction performance in both steady and unsteady flow simulations under a unified form. The present study aims at a comprehensive assessment of this model through classical flow test cases. A two-dimensional zero-pressure-gradient boundary layer case is used to validate the currently introduced realizable correction of this model. Steady computations of the three-dimensional CRM wing/body show its engineering applicability compared with the SA model and the SST model. A grid convergence study is included. In the unsteady computations with the k-kL model, massive separation flows over the periodic hills are well predicted with rich vortical structures. The time-averaged friction distribution and the velocity field are in good agreement with the experimental data and the previous Large Eddy Simulation results. All above demonstrates the advantage and potential of this turbulence model in both steady and unsteady flow simulations.