aKyushu Institute of Technology
bKyushu University
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.