F333 流体騒音の数値解析の現状と課題(F-33 騒音(3),一般講演)

概要

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Computational Aeroacoustics, which is defined as a method that numerically predicts sound due to fluid motion, is expected to become a powerful engineering tool for identifying primary mechanism of noise generation from the flow of interest and investigating means to achieve noise reduction. Unlike in the United States and some European countries, where noise generated from high-speed flow such as jet engine noise (fan noise) is of the central interest in this field, noise generated from relatively low-speed flow is the major interest in Japan and some Asian countries. This includes noise form low-pressure fans, automobiles and high-speed trains. Prediction of noise due to low-speed flows is, in general (or practically), achieved by a decoupling method where source fluctuations are first computed and fed to the following acoustic computation as the input data with an assumption that the generated sound does not alter the source flow field. It is crucially important to apply a decoupling method that is appropriate and most feasible to the flow and sound field of interest. Then, the accuracy of the source computations generally determines the overall performance of the sound prediction. This paper focuses on the noise generated from low-speed flows and overviews the present status of the noise prediction. Issues to be solved will also be addressed.
日本流体力学会の論文
2004-08-09