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Influence of non-uniform mean flow on acoustic scattering from complex geometries

Influence of non-uniform mean flow on acoustic scattering from complex geometries
Influence of non-uniform mean flow on acoustic scattering from complex geometries

An immersed boundary computational model is presented to study the influence of non-uniform mean flow on acoustic scattering from complex geometries. It is firstly demonstrated from two benchmark problems that an absorbing treatment for the interior of solid domain in the developed immersed boundary method is not necessary. Then, simulations for acoustic scattering both from a circular cylinder and multiple bodies with different mean flow models are performed. It is found that the existence of a core wake region in a background mean flow model plays a significant role in accurately predicting acoustic directivity. When a sound source is in the core wake region, the background mean flow model has an obvious influence on the predicted acoustic directivity whether for a simple circular cylinder or multiple bodies; when the sound source is away from the core wake region, consistent results for different background mean flow models in most directions are obtained. However, about a maximum 8 dB discrepancy in the “front arm” direction of a circular cylinder and about a maximum 4.8 dB discrepancy in the downstream direction for the multi-element airfoil are caused respectively for the parallel and viscous mean flow models.

Acoustic scattering, Immersed boundary, Linearized Euler equations, Non-uniform mean flows
0045-7930
20-31
Cheng, Long
ce31aecf-304a-478e-ab62-6df8afc3d6a9
Du, Lin
3d2aaded-e559-4cfa-aeb1-3f02ab75f262
Wang, Xiaoyu
5f641500-aab2-4a08-9c65-6d4d0f2716ad
Wu, Long
9787473b-a81a-47ce-a696-22afa8c2204b
Jing, Xiaodong
9bd7313a-4ab2-4387-839e-4c1583f61531
Sun, Xiaofeng
87a75751-8d01-440e-a234-02d4a6436ef6
Cheng, Long
ce31aecf-304a-478e-ab62-6df8afc3d6a9
Du, Lin
3d2aaded-e559-4cfa-aeb1-3f02ab75f262
Wang, Xiaoyu
5f641500-aab2-4a08-9c65-6d4d0f2716ad
Wu, Long
9787473b-a81a-47ce-a696-22afa8c2204b
Jing, Xiaodong
9bd7313a-4ab2-4387-839e-4c1583f61531
Sun, Xiaofeng
87a75751-8d01-440e-a234-02d4a6436ef6

Cheng, Long, Du, Lin, Wang, Xiaoyu, Wu, Long, Jing, Xiaodong and Sun, Xiaofeng (2018) Influence of non-uniform mean flow on acoustic scattering from complex geometries. Computers and Fluids, 163, 20-31. (doi:10.1016/j.compfluid.2017.12.014).

Record type: Article

Abstract

An immersed boundary computational model is presented to study the influence of non-uniform mean flow on acoustic scattering from complex geometries. It is firstly demonstrated from two benchmark problems that an absorbing treatment for the interior of solid domain in the developed immersed boundary method is not necessary. Then, simulations for acoustic scattering both from a circular cylinder and multiple bodies with different mean flow models are performed. It is found that the existence of a core wake region in a background mean flow model plays a significant role in accurately predicting acoustic directivity. When a sound source is in the core wake region, the background mean flow model has an obvious influence on the predicted acoustic directivity whether for a simple circular cylinder or multiple bodies; when the sound source is away from the core wake region, consistent results for different background mean flow models in most directions are obtained. However, about a maximum 8 dB discrepancy in the “front arm” direction of a circular cylinder and about a maximum 4.8 dB discrepancy in the downstream direction for the multi-element airfoil are caused respectively for the parallel and viscous mean flow models.

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More information

Accepted/In Press date: 21 December 2017
e-pub ahead of print date: 22 December 2017
Published date: 2 January 2018
Additional Information: Funding Information: the authors appreciate Chao Chen in FAEL for his help in simulating acoustic scattering from a circular cylinder in a potential mean flow based on a body-fitted grid in-house solver. The financial supports of the NSFC (Grant No. 51706006 and 51576009 ) are gratefully acknowledged.
Keywords: Acoustic scattering, Immersed boundary, Linearized Euler equations, Non-uniform mean flows

Identifiers

Local EPrints ID: 485876
URI: http://eprints.soton.ac.uk/id/eprint/485876
ISSN: 0045-7930
PURE UUID: f23610ae-9045-40bc-afdb-ab9f9c489226
ORCID for Long Wu: ORCID iD orcid.org/0009-0006-8578-7755

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Date deposited: 03 Jan 2024 19:33
Last modified: 06 Jun 2024 02:05

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Contributors

Author: Long Cheng
Author: Lin Du
Author: Xiaoyu Wang
Author: Long Wu ORCID iD
Author: Xiaodong Jing
Author: Xiaofeng Sun

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