Parallel computations on pressure fluctuations of supersonic cavity flows
Parallel computations have been carried out on supersonic internal cavity flows in order to investigate what causes the pressure fluctuations. The case of L/D=2 under M=1.83 has been studied by using the Euler and Navier-Stokes equations and FFT analysis. The numerical results have been compared with the theories predicting the frequencies of pressure oscillations. As results it is confirmed that the pressure fluctuations are the interacting phenomena between sound waves and viscosity, that the viscosity selects the dominant frequency mode, and that the disturbance such as an oblique shock wave does not affect the frequencies. Finally the viscous propagation model has been presented under the hypothesis of standing waves, and the mechanism of pressure fluctuations has been made clear.
Key WordsParallel Methods Supersonic Cavity Flows Propagation Model Mechanism of Pressure Fluctuations
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