S0505-1-2 複数キャビティから発生する空力音の数値解析(車両・機体・流体機械に関連した騒音問題へのアプローチと対策(1))

概要

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We numerically investigate the change of the flow fields in cases of past one cavity, two cavities and four cavities by using large eddy simulation (LES). The consequences on noise generation are studied. The sixth-order compact difference scheme is used for the convection term. The sixth-order filter is employed. Second-order six-stage Runge-Kutta method is adopted as time integration. In each flow field, a peak of sound pressure level generated from feedback loop is observed. The sound pressure level of the peak of one cavity case is highest of three cases. On the other hand, multiple cavities increase the sound pressure levels in the entire frequency band without peak frequencies. In this study, the knowledge of predicting the frequencies of discrete tones and the details of these physical processes is discussed.
2009-09-12