TY - JOUR
T1 - A combined analytical and numerical analysis of the flow-acoustic coupling in a cavity-pipe system
AU - Langthjem, Mikael A.
AU - Nakano, Masami
N1 - Funding Information:
Acknowledgements The work reported here was supported by Collaborative Research Project Grants (Nos. J15058 and J16073) from the Institute of Fluid Science (IFS), Tohoku University, Japan. Computations were carried out at the Advanced Fluid Information Research Center, IFS. Helpful and prompt support in this connection is gratefully acknowledged. We also wish to thank the referees for valuable comments which have helped to improve the paper significantly.
Publisher Copyright:
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - The generation of sound by flow through a closed, cylindrical cavity (expansion chamber) accommodated with a long tailpipe is investigated analytically and numerically. The sound generation is due to self-sustained flow oscillations in the cavity. These oscillations may, in turn, generate standing (resonant) acoustic waves in the tailpipe. The main interest of the paper is in the interaction between these two sound sources. An analytical, approximate solution of the acoustic part of the problem is obtained via the method of matched asymptotic expansions. The sound-generating flow is represented by a discrete vortex method, based on axisymmetric vortex rings. It is demonstrated through numerical examples that inclusion of acoustic feedback from the tailpipe is essential for a good representation of the sound characteristics.
AB - The generation of sound by flow through a closed, cylindrical cavity (expansion chamber) accommodated with a long tailpipe is investigated analytically and numerically. The sound generation is due to self-sustained flow oscillations in the cavity. These oscillations may, in turn, generate standing (resonant) acoustic waves in the tailpipe. The main interest of the paper is in the interaction between these two sound sources. An analytical, approximate solution of the acoustic part of the problem is obtained via the method of matched asymptotic expansions. The sound-generating flow is represented by a discrete vortex method, based on axisymmetric vortex rings. It is demonstrated through numerical examples that inclusion of acoustic feedback from the tailpipe is essential for a good representation of the sound characteristics.
KW - Aeroacoustics
KW - Discrete vortex method
KW - Flow–sound interaction
KW - Matched asymptotic expansions
KW - Self-sustained flow oscillations
KW - Vortex sound
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U2 - 10.1007/s00162-018-0462-4
DO - 10.1007/s00162-018-0462-4
M3 - Article
AN - SCOPUS:85046772035
VL - 32
SP - 451
EP - 473
JO - Theoretical and Computational Fluid Dynamics
JF - Theoretical and Computational Fluid Dynamics
SN - 0935-4964
IS - 4
ER -