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Cavity flow noise predictions

Cavity flow noise predictions
Cavity flow noise predictions
The near and far pressure fields of three-dimensional turbulent cavity flow are studied by time-accurate simulations coupled with aeroacoustic predictions. A large-eddy simulation (LES) method is applied to a cavity with a 5:1:1 length to depth to width ratio at high Reynolds number (6.8 million based on cavity length) and compared with experiment. A good agreement is found for Rossiter mode amplitudes for all but the first mode, a finding that is in agreement with other numerical simulations. A detached eddy simulation (DES) is carried out at a lower Reynolds number of 45000. For the DES simulation, results from both coarse and fine grids have no obvious differences, suggesting that a grid of one million cells is sufficient. A low-storage Ffowcs Williams-Hawkings (FW-H) solver for far field noise prediction is validated fro both closed and open integration surfaces. For three-dimensional calculations it is found that spanwise integration lengths of a least 20 cavity depths give the most accurate far field predictions. For the high Reynolds number cavity peak radiation is found in the range of 57-60 degrees (with angles measured relative to the upstream direction). For the lower Reynolds number cavity both fine and coarse grid cases predict a peak radiation angle of 54 degrees. Noise attenuation is studied by placing a liner on the inner cavity walls. It is found that liners have a positive effect for the broadband noise reduction. Optimum noise reduction is found with complete coverage of the cavity floor and walls.
AFM 07/05
University of Southampton
Chen, Xiaoxian
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Chen, Xiaoxian
1c7ce635-f117-4cb5-8f61-cb6a9b23d8a5
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421

Chen, Xiaoxian, Sandham, Neil D. and Zhang, Xin (2007) Cavity flow noise predictions (School of Engineering Sciences Aerospace Engineering AFM Reports, AFM 07/05) Southampton, UK. University of Southampton 51pp.

Record type: Monograph (Project Report)

Abstract

The near and far pressure fields of three-dimensional turbulent cavity flow are studied by time-accurate simulations coupled with aeroacoustic predictions. A large-eddy simulation (LES) method is applied to a cavity with a 5:1:1 length to depth to width ratio at high Reynolds number (6.8 million based on cavity length) and compared with experiment. A good agreement is found for Rossiter mode amplitudes for all but the first mode, a finding that is in agreement with other numerical simulations. A detached eddy simulation (DES) is carried out at a lower Reynolds number of 45000. For the DES simulation, results from both coarse and fine grids have no obvious differences, suggesting that a grid of one million cells is sufficient. A low-storage Ffowcs Williams-Hawkings (FW-H) solver for far field noise prediction is validated fro both closed and open integration surfaces. For three-dimensional calculations it is found that spanwise integration lengths of a least 20 cavity depths give the most accurate far field predictions. For the high Reynolds number cavity peak radiation is found in the range of 57-60 degrees (with angles measured relative to the upstream direction). For the lower Reynolds number cavity both fine and coarse grid cases predict a peak radiation angle of 54 degrees. Noise attenuation is studied by placing a liner on the inner cavity walls. It is found that liners have a positive effect for the broadband noise reduction. Optimum noise reduction is found with complete coverage of the cavity floor and walls.

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More information

Published date: 2007
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 45391
URI: https://eprints.soton.ac.uk/id/eprint/45391
PURE UUID: cc31e8fc-28a8-460c-9c36-8a2a103b6749
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 27 Mar 2007
Last modified: 14 Mar 2019 01:49

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