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Towards a generic non-reflective characteristic boundary condition for aeroacoustic simulations

Towards a generic non-reflective characteristic boundary condition for aeroacoustic simulations
Towards a generic non-reflective characteristic boundary condition for aeroacoustic simulations
A blended zonal characteristic boundary condition is proposed following a quantitative investigation of the performance of several non-reflective boundary conditions. Two test cases are considered that investigate the effects of acoustic and vortical plane waves impinging on the domain outflow region. A third test case investigates the effects of broadband turbulent flow impinging on a non-reflective outflow boundary condition. From these studies, two non-reflective boundary conditions based on a zonal characteristic method are found to provide a minimal acoustic response for impinging acoustic and vortical disturbances, respectively. These methods both make use of the transverse characteristic terms
to improve performance, although each method uses a different inclusion of these terms.
A final boundary condition is proposed that blends the performance of the two zonal characteristic methods. A blending function is used that switches the characteristic boundary condition smoothly between regions dominated by acoustic, or vortical, disturbances. The feasibility of this novel method is demonstrated on a test case where broadband turbulence impinges on a small section of an outflow region.
American Institute of Aeronautics and Astronautics
Fattah, Ryu
658d0694-d683-4839-89a0-b95601ebe365
Gill, James
1e31eb24-f833-462e-b610-23b5b28e7285
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Fattah, Ryu
658d0694-d683-4839-89a0-b95601ebe365
Gill, James
1e31eb24-f833-462e-b610-23b5b28e7285
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421

Fattah, Ryu, Gill, James and Zhang, Xin (2016) Towards a generic non-reflective characteristic boundary condition for aeroacoustic simulations. In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics. 18 pp . (doi:10.2514/6.2016-2914).

Record type: Conference or Workshop Item (Paper)

Abstract

A blended zonal characteristic boundary condition is proposed following a quantitative investigation of the performance of several non-reflective boundary conditions. Two test cases are considered that investigate the effects of acoustic and vortical plane waves impinging on the domain outflow region. A third test case investigates the effects of broadband turbulent flow impinging on a non-reflective outflow boundary condition. From these studies, two non-reflective boundary conditions based on a zonal characteristic method are found to provide a minimal acoustic response for impinging acoustic and vortical disturbances, respectively. These methods both make use of the transverse characteristic terms
to improve performance, although each method uses a different inclusion of these terms.
A final boundary condition is proposed that blends the performance of the two zonal characteristic methods. A blending function is used that switches the characteristic boundary condition smoothly between regions dominated by acoustic, or vortical, disturbances. The feasibility of this novel method is demonstrated on a test case where broadband turbulence impinges on a small section of an outflow region.

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Accepted/In Press date: 2 February 2016
e-pub ahead of print date: June 2016
Venue - Dates: 22nd AIAA/CEAS Aeroacoustics Conference, France, 2016-05-30 - 2016-06-01
Organisations: Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 396438
URI: https://eprints.soton.ac.uk/id/eprint/396438
PURE UUID: 2b24adc9-3085-4d08-b55f-7c71821254fd

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Date deposited: 08 Jun 2016 15:57
Last modified: 14 Aug 2019 17:03

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Contributors

Author: Ryu Fattah
Author: James Gill
Author: Xin Zhang

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