Numerical Simulation for Self-oscillation Evoked by Cavity Flow at Ultra Low Mach Numbers

WANG Yi-ping, WANG Wen-long, YANG Xue, DENG Ya-dong, SU Chu-qi

China Journal of Highway and Transport ›› 2015, Vol. 28 ›› Issue (7) : 121-126.

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China Journal of Highway and Transport ›› 2015, Vol. 28 ›› Issue (7) : 121-126.

Numerical Simulation for Self-oscillation Evoked by Cavity Flow at Ultra Low Mach Numbers

  • WANG Yi-ping1,2, WANG Wen-long3, YANG Xue4, DENG Ya-dong2, SU Chu-qi2
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Abstract

In order to reveal the mechanism of self-oscillation evoked by cavity flow at ultra low Mach number, the instantaneous flow field and pressure fluctuation inside the cavity were computed by large eddy simulation based on the weakly compressible fluid model. To validate the computational scheme, the pressure fluctuation inside the cavity obtained by numerical simulation was compared with that by low noise wind tunnel measurement. The results show that the large eddy simulation for weakly compressible fluid model can accurately predict the frequency and amplitude of the self-oscillation at ultra low Mach number. The frequency distribution reveals that the self-oscillation is quasi-harmonic. The flow field structure inside the cavity and the vortex motion along the opening reveal the mechanism of self-oscillation, that is, vortex shedding from the leading edge of cavity will hit the trailing edge of the cavity, then a pressure rebound will appear, finally, the rebound pressure wave will intensify the vortex shedding.

Key words

automotive engineering / cavity flow / weakly compressible fluid model / large eddy simulation

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WANG Yi-ping, WANG Wen-long, YANG Xue, DENG Ya-dong, SU Chu-qi. Numerical Simulation for Self-oscillation Evoked by Cavity Flow at Ultra Low Mach Numbers[J]. China Journal of Highway and Transport, 2015, 28(7): 121-126

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