Unstructured large eddy simulation technology for aeroaco ustics of complex jet flows

The present paper reviews the unstructured large eddy simul ation (LES) technology that has been developed for high-fidelity computations of complex jet flow problems. The LES framework features low-dissipation and low-dispersion numerical discretization on unstructu red meshes, localized adaptive refinement to capture fine-scale turbulence, and localized shock-capturing schemes. To demonstrate the capability to efficiently handle realistic nozzle geometries, large eddy sim ulations are performed for a separate-flow nozzle of bypass ratio 5 with round fan and core nozzle operating at t he takeoff cycle point. As an example of complex jet configurations with strong shock/turbulence in t ractions, LES of supersonic impinging jets are conducted at different nozzle pressure ratios. In both case s, qualitative and quantitative comparisons between simulations and experiments are shown, as well as grid convergence studies. Overall, the flow and noise predictions show good agreement with the available ex p rimental measurements.

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