Large-Eddy Simulation of the Tip Flow of a Rotor in Hover

An efficient and flexible parallel version of a Large-Eddy Simulation (LES) solver has been developed to simulate the compressible tip-flow of a rotor in hover. The solver employs an immersed-boundary technique in conjunction with a curvilinear structured grid and the dynamic model is used to model the subgrid scale (SGS) stress terms. The solver also employs a hybrid implicit-explicit time-discretization scheme wherein the diagonal viscous terms are treated implicitly and all other terms including the convective terms and cross- terms are treated explicitly using a low-storage 3 rd -order Runge-Kutta scheme. A mixed second-order central-difference-QUICK scheme has been used which allows us to precisely control the numerical damping. Preliminary results from non-rotating tip-flow are presented.

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