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Computation of aeolian tone from a circular cylinder using source models

Computation of aeolian tone from a circular cylinder using source models
Computation of aeolian tone from a circular cylinder using source models
The generation of aeolian tones from a two-dimensional circular cylinder situated in a uniform cross-flow is investigated. The major emphasis here is placed on identifying the important noise generation mechanisms. Acoustic-viscous splitting techniques are utilized to compute modelled acoustic source terms and their corresponding acoustic fields. The incompressible Reynolds averaged Navier–Stokes equation is used to compute the near-field viscous flow solution, from which modelled acoustic source terms are extracted based on an approximation to the Lighthill’s stress tensor. Acoustic fields are then computed with an acoustic solver to solve the linearized Euler equations forced by the modelled source terms. Computations of the acoustic field based on the approximated Lighthill’s stress tensor are shown to be in good agreement with those computed from the surface dipole sources obtained using Curle’s solution to the acoustic analogy. It is shown in this paper that the stress tensor source term in the streamwise direction makes a comparable, but slightly larger contribution to the overall radiated field, compared with that due to the stress tensor in the direction normal to the mean flow. In addition, it is shown that shear sources, which arise due to the interaction between the fluctuating velocity and the background steady mean velocity, make the greatest contribution to the acoustic field, while the self-noise sources, which represents the interaction between the fluctuating velocities, is shown to be comparably negligible.
aeolian tone, lighthill’s stress tensor, shear-noise source, self-noise source, computational aeroacoustics
0003-682X
110-126
Cheong, Cheolung
8891ef93-d484-4d86-b50d-db37154ab922
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Park, Yonghwan
c3a317b3-9b53-4ea6-bd0b-e3bad684b179
Lee, Soogab
7a4eacfa-79b1-4143-9852-e69ff4ed8780
Cheong, Cheolung
8891ef93-d484-4d86-b50d-db37154ab922
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Park, Yonghwan
c3a317b3-9b53-4ea6-bd0b-e3bad684b179
Lee, Soogab
7a4eacfa-79b1-4143-9852-e69ff4ed8780

Cheong, Cheolung, Joseph, Phillip, Park, Yonghwan and Lee, Soogab (2008) Computation of aeolian tone from a circular cylinder using source models. Applied Acoustics, 69 (2), 110-126. (doi:10.1016/j.apacoust.2006.10.004).

Record type: Article

Abstract

The generation of aeolian tones from a two-dimensional circular cylinder situated in a uniform cross-flow is investigated. The major emphasis here is placed on identifying the important noise generation mechanisms. Acoustic-viscous splitting techniques are utilized to compute modelled acoustic source terms and their corresponding acoustic fields. The incompressible Reynolds averaged Navier–Stokes equation is used to compute the near-field viscous flow solution, from which modelled acoustic source terms are extracted based on an approximation to the Lighthill’s stress tensor. Acoustic fields are then computed with an acoustic solver to solve the linearized Euler equations forced by the modelled source terms. Computations of the acoustic field based on the approximated Lighthill’s stress tensor are shown to be in good agreement with those computed from the surface dipole sources obtained using Curle’s solution to the acoustic analogy. It is shown in this paper that the stress tensor source term in the streamwise direction makes a comparable, but slightly larger contribution to the overall radiated field, compared with that due to the stress tensor in the direction normal to the mean flow. In addition, it is shown that shear sources, which arise due to the interaction between the fluctuating velocity and the background steady mean velocity, make the greatest contribution to the acoustic field, while the self-noise sources, which represents the interaction between the fluctuating velocities, is shown to be comparably negligible.

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More information

Submitted date: 11 May 2006
Published date: February 2008
Keywords: aeolian tone, lighthill’s stress tensor, shear-noise source, self-noise source, computational aeroacoustics

Identifiers

Local EPrints ID: 51046
URI: https://eprints.soton.ac.uk/id/eprint/51046
ISSN: 0003-682X
PURE UUID: 81e9e383-8086-4792-a752-d48c01539c5d

Catalogue record

Date deposited: 01 May 2008
Last modified: 13 Mar 2019 20:49

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