Numerical study on unsteady fluid flow and acoustic field in the clarinet mouthpiece with the compressible LES

Toshiaki Koiwayaa, Sho Iwagamia, Taizo Kobayashib and Kin'Ya Takahashia

aKyushu Institute of Technology
bKyushu University

Saturday, September 14, 2019 from 19:20 to 19:40

in Summer Theater

Abstract :
The sound generation in the clarinet mouthpiece is still an unsolved problem from the view point of aeroacoustic and has been studied theoretically, experimentally and numerically by many authors. Numerical simulations on the unsteady flow in the clarinet mouthpiece using LBM have been reported by several authors. In this paper, we numerically study unsteady fluid flow and acoustic field in the clarinet mouthpiece with compressible LES. We adopt 2D and 3D models and the 3D model has numerical grids more than one hundred and 50 million to reproduce detail behavior of air-jet motion, vortices and acoustic filed. In our models, the reed is fixed and an uniform flow is injected from the reed slit to study the behavior in the attack transient. The 2D and 3D models behave in different ways. For the 2D model, the injected jet is rolled up making long-lived rotors in the mouthpiece, while for the 3D model it is destabilized in a certain distance is broken into a lamp of turbulence. We also study the station that an alternating current is injected from the slit to reproduce the acoustic resonance.

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