Understanding the generation mechanism and characteristics of flow noise is of great significance for accurately predicting and reducing the noise of offshore structures.To analyze the acoustic radiation characteristics of the flow around a three-dimensional cylinder in detail,a numerical simulation study on the flow noise of a three-dimensional cylinder was carried out.First,the unsteady flow field characteristics were calculated using the large eddy simulation(LES)method,and the results were compared with experimental data,showing good agreement.Then,based on the flow field results,the far-field noise was predicted using the FW-H equation by the area integral method,and the overall sound pressure level had an error within 5%compared to the experimental data,verifying the effectiveness of the method.Subsequently,the radiation characteristics of the flow noise around the cylinder were analyzed,and it was found that the overall sound pressure levels at symmetric points around the cylinder were equal,indicating that the sound field of the cylinder flow has symmetry.There are peaks in the sound pressure levels at points perpendicular and parallel to the flow direction,with the peak frequencies corresponding to the vortex shedding frequency of the cylinder flow and twice the vortex shedding frequency,respectively.Finally,the effect of different Reynolds numbers on the cylinder flow noise within the subcritical Reynolds number range was analyzed.The analysis results will provide some reference for subsequent noise reduction research.
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