Abstract
The two kinds of cavities, respectively with opening hole and slotted hole, numerically simulated based on the theory of large eddy simulation and acoustic analogy were performed. Firstly, according to the differences between vorticity and pressure magnitude contours of the flow filed around the slotted hole and opening hole, the influences on the flow field of the baffles were illustrated. Secondly, by analysing the power spectrum density of the monitoring points, the main noise source of these two models was found. Lastly, the flow-noise frequency spectrum of slotted hole and opening hole indicated that the grilles play an significant role in reducing the radiation of the flow-noise generated by the cavity with hole.
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