Large Eddy Simulation of Screech Tone Generation in a Planar Underexpanded Jet

The screech tones generated by a three-dimensional planar underexpanded jet are computed directly using compressible large eddy simulation (LES). The jet operates at fully expanded Mach number Mj = 1.55, with Reynolds number Reh = 6 × 10 . The LES strategy is based on explicit selective filtering with spectral-like resolution, and low dispersion and low dissipation numerical algorithms are implemented to allow direct noise computation of the phenomenon. The investigation of the numerical results shows that the flow development, the shock cell structure and the upstream acoustic field are well reproduced by the computation. Flow visualization of shock/vortex interactions within the third shock-cell provides evidences that screech sound sources can be interpreted using the shock-leakage theory.

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