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Predictive Simulation of Flow-induced Noise using CFD

Article of Honda R&D Technical Review Vol.26 No.2

Summary

A method of predictive simulation of flow-induced noise using computational fluid dynamics has been developed. In order to simulate flow-induced noise, it is necessary to compute detailed vortex flows and density change of air. This paper introduces the existence of flow-induced noise predicted by unsteady compressible flow calculations using large vortex simulation, a type of turbulence model. The target flow-induced noise for prediction was narrow-band noise, also known as whistling noise, a type of noise in which sound increases at specific frequencies. With the exhaust pipe, including the complex shape of the silencer, as the subject of predictive simulation of flow-induced noise, predictive accuracy was verified by simulating the measurement conditions of steady-state flow. The developed method makes it possible to judge whether narrow-band noise will be generated or not, and to identify the position of the sound source.

Reference

(1) Perot, B. J.: An Analysis of the Fractional-Step Method, Journal of Computational Physics, Vol. 108, p. 51-58 (1993)
(2) Takahashi, K., Miyamoto, M., Ito, Y., Iwasaki, T., Takami, T., Kobayashi, T., Nishida, A., Aoyagi, M.: 3jigen Earidogakki no Ryutaiongen to Hasshintokusei, RIMS Kokyuroku, Vol. 1776, p. 100–114 (2012) (in Japanese)
(3) Yokoyama, H., Kato, C.: Fluid-Acoustic Interactions in Acoustic Radiation in Turbulent Cavity Flows, Transactions of the Japan Society of Mechanical Engineers, Series B, Vol. 75, No. 760, p. 2369–2378 (2009)
(4) Iida, A.: Study on Aerodynamic Noise of Automobiles, Journal of Wind Engineering, Vol. 36, No. 3, p. 250-257 (2011) (in Japanese)
(5) Mochizuki, O., Maruta, T.: Nagare no Oto ha Dokokarakurunoka, Ryutaion Kogaku Nyumon, Asakura Publishing Co., Ltd., p. 74 – 97 (1996) (in Japanese)

Author (organization or company)

Katsutomo KANAI(Automobile R&D Center)、Hideki KATSUYAMA(Automobile R&D Center)、Yuichi FUSHIMI(Automobile R&D Center)、Norikazu YAMAMOTO(Automobile R&D Center)

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