aKyushu Institute of Technology
Coupled Van der Pol oscillators are often used for the studying of synchronization mechanism among flue organ pipes. However, recent studies have suggested that the effect of near-field interaction between the air-jet motion and the acoustic field plays an important role in the mechanism of synchronization. In this study, we focus on the synchronization between an air-jet instrument and external sound source. We numerically explore the synchronization mechanism using a finite-difference lattice Boltzmann method (FDLBM) as a direct aeroacoustic simulation scheme in two dimensions. We succeed in reproducing the frequency-locking phenomenon between the monopole sound source and air-jet instrument in the stationary state. Numerical simulations are conducted on a GPU cluster to explore the large parameter space. Transient behavior towards the frequency-locking phenomenon was observed, and the results demonstrate that the external sound source strongly affects the air-jet oscillation and the phase relationship of the sound pressure inside the resonator.
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