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Synthetic turbulence methods for leading edge noise predictions

Synthetic turbulence methods for leading edge noise predictions
Synthetic turbulence methods for leading edge noise predictions
An advanced digital filter method to generate synthetic turbulence is presented for efficient two- and three-dimensional leading edge noise predictions. The technique, which is based on the Random Particle-Mesh method, produces a turbulent inflow that matches a target isotropic energy spectrum. The discretized equations for the synthetic eddies, and the input parameters needed to recover the desired turbulence statistics, are presented. Moreover, a simple and fast implementation strategy, which does not require an additional boundary condition, is presented under the frozen turbulence assumption. The method is used in a linearized Euler solver to predict turbulence-airfoil interaction noise from a number of configurations, including variations in airfoil thickness, angle of attack and Mach number. For the first time, noise predictions from a digital filter method are directly compared to those provided by synthetic turbulence based on a summation of Fourier modes. The comparison indicates that the advanced digital filter method gives enhanced performance in terms of computational cost and simulation accuracy. In addition, initial tests show that this method is capable of reproducing experimental noise measurements within 3 dB accuracy.
computational aeroacoustics, synthetic turbulence, digital filter, leading edge noise
Gea-Aguilera, Fernando
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Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, Xiaoxian
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Gill, James R.
1e31eb24-f833-462e-b610-23b5b28e7285
Node-Langlois, Thomas
746d8e36-a76a-449d-95d2-0da56af9ec44
Gea-Aguilera, Fernando
8aaa69d6-7618-4b2e-9942-e1ab4084aba4
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, Xiaoxian
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Gill, James R.
1e31eb24-f833-462e-b610-23b5b28e7285
Node-Langlois, Thomas
746d8e36-a76a-449d-95d2-0da56af9ec44

Gea-Aguilera, Fernando, Zhang, Xin, Chen, Xiaoxian, Gill, James R. and Node-Langlois, Thomas (2015) Synthetic turbulence methods for leading edge noise predictions. 21st AIAA/CEAS Aeroacoustics Conference, Dallas, United States. 22 - 25 Jun 2015. 23 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

An advanced digital filter method to generate synthetic turbulence is presented for efficient two- and three-dimensional leading edge noise predictions. The technique, which is based on the Random Particle-Mesh method, produces a turbulent inflow that matches a target isotropic energy spectrum. The discretized equations for the synthetic eddies, and the input parameters needed to recover the desired turbulence statistics, are presented. Moreover, a simple and fast implementation strategy, which does not require an additional boundary condition, is presented under the frozen turbulence assumption. The method is used in a linearized Euler solver to predict turbulence-airfoil interaction noise from a number of configurations, including variations in airfoil thickness, angle of attack and Mach number. For the first time, noise predictions from a digital filter method are directly compared to those provided by synthetic turbulence based on a summation of Fourier modes. The comparison indicates that the advanced digital filter method gives enhanced performance in terms of computational cost and simulation accuracy. In addition, initial tests show that this method is capable of reproducing experimental noise measurements within 3 dB accuracy.

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More information

e-pub ahead of print date: June 2015
Venue - Dates: 21st AIAA/CEAS Aeroacoustics Conference, Dallas, United States, 2015-06-22 - 2015-06-25
Keywords: computational aeroacoustics, synthetic turbulence, digital filter, leading edge noise
Organisations: Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 378720
URI: http://eprints.soton.ac.uk/id/eprint/378720
PURE UUID: 4d445b80-09a2-476f-979f-8615edd726b1

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Date deposited: 18 Jul 2015 16:31
Last modified: 14 Mar 2024 20:27

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Contributors

Author: Fernando Gea-Aguilera
Author: Xin Zhang
Author: Xiaoxian Chen
Author: James R. Gill
Author: Thomas Node-Langlois

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