TY - GEN
T1 - Reproducibility of mode transition of edge tone with DNS and LES
AU - Iwagami, Sho
AU - Kobayashi, Taizo
AU - Takahashi, Kinya
AU - Hattori, Yuji
N1 - Funding Information:
The present work was supported by Grant-in-Aid for Scientific Research (C) Nos. 16K05477 and 19K03655 from the Japan Society for the Promotion of Science (JSPS) and “Joint Usage/Research Center for Interdisciplinary Large-Scale Information Infrastructures” and “High Performance Computing Infrastructure” in Japan (Project IDs: jh180007-MDH and jh190010-MDH). Part of the work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University.
Publisher Copyright:
© 2019 Proceedings of the International Congress on Acoustics. All rights reserved.
PY - 2019
Y1 - 2019
N2 - A jet attacking a edge oscillates spontaneously, and generates aerodynamic sound called edge tone. The edge tone is the sound source of air-jet instruments like a recorder and flute. The jet oscillation has several modes. While one of the modes is selected, the frequency increases linearly with the jet velocity. When the jet velocity exceeds a threshold, the mode transition arises, and it is hysteretic. The mode transition induces sudden changes of the frequency and the sound energy. Therefore, the reproducibility of the mode transition with a numerical calculation is crucial for understanding the mechanism of edge tone. In this study, the 2D model of edge tone is investigated with compressible DNS and LES. The DNS adopted in our study is an exact method without any artificial viscosity terms. The mode transition can be accurately reproduced with DNS. On the other hand, in some cases of calculations with LES, the mode transition cannot be reproduced even though the calculation is not broken down. We discuss the details of this problem.
AB - A jet attacking a edge oscillates spontaneously, and generates aerodynamic sound called edge tone. The edge tone is the sound source of air-jet instruments like a recorder and flute. The jet oscillation has several modes. While one of the modes is selected, the frequency increases linearly with the jet velocity. When the jet velocity exceeds a threshold, the mode transition arises, and it is hysteretic. The mode transition induces sudden changes of the frequency and the sound energy. Therefore, the reproducibility of the mode transition with a numerical calculation is crucial for understanding the mechanism of edge tone. In this study, the 2D model of edge tone is investigated with compressible DNS and LES. The DNS adopted in our study is an exact method without any artificial viscosity terms. The mode transition can be accurately reproduced with DNS. On the other hand, in some cases of calculations with LES, the mode transition cannot be reproduced even though the calculation is not broken down. We discuss the details of this problem.
KW - Aerodynamic Sound
KW - DNS
KW - Edge tone
KW - LES
UR - http://www.scopus.com/inward/record.url?scp=85099330104&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85099330104&partnerID=8YFLogxK
U2 - 10.18154/RWTH-CONV-239501
DO - 10.18154/RWTH-CONV-239501
M3 - Conference contribution
AN - SCOPUS:85099330104
T3 - Proceedings of the International Congress on Acoustics
SP - 5573
EP - 5579
BT - Proceedings of the 23rd International Congress on Acoustics
A2 - Ochmann, Martin
A2 - Michael, Vorlander
A2 - Fels, Janina
PB - International Commission for Acoustics (ICA)
T2 - 23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
Y2 - 9 September 2019 through 23 September 2019
ER -