Abstract
A self-adaptive dissipation method based on a fifth-order dissipative compact scheme is proposed to reduce the numerical dissipation in separated flow. The method involves a self-adaptive operating parameter to adjust the weight of upwind part, which is a major source of numerical dissipation. Cooperated with delayed detached eddy simulation, the method can perform with less numerical dissipation in a large-eddy simulation region to resolve more small-scale structures, and return to normal dissipation in a Reynolds-averaged Navier–Stokes region to stabilize simulation. Firstly, the decay of isotropic turbulence is simulated to study the influence of the method over the energy spectrum and resolution of turbulent structures. Secondly, the plane channel flow is simulated to test the stability under the pressure gradient and turbulent fluctuation. Finally, the typical separated flow over NACA0021 airfoil and circular cylinder is investigated, and the results are compared with experimental data.
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