Direct aeroacoustic simulation around oscillating plate coupled with object motion

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820044
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Yokoyama Hiroshi 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (60581428)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 空力音 / 物体振動 / 共鳴 / リード楽器 / 流れと音の直接計算 / 平板列 / 流体制御 / 連成解析

Outline of Final Research Achievements

The computational methods for predicting the flow and acoustic fields simultaneously around oscillating objects were proposed. In reed instruments, sound is radiated from a oscillating reed along with acoustic resonance in a tube. Based on the measured time variation of the displacement of the reed, the radiated sound was predicted by the present computational methods. As a result, the sound pressure level at the fundamental frequency was in good agreement with the measured level.
Also, the resonant sound is radiated from a flow around a cascade of flat plates. The control of the flow and sound by oscillating downstream edges of the plates was investigated using the present computational methods. Even with the small amplitude of 15 % to the plate thickness, the sound pressure level at the fundamental frequency was decreased by 10 dB by changing the mode of vortex shedding from the plates.

Free Research Field

流体力学，空力音響学，数値流体力学，流体制御