Fast Low-Storage Method for Evaluating Lighthill’s Volume Quadrupoles

Croaker, Paul; Kessissoglou, Nicole; Kinns, Roger; Marburg, Steffen

doi:10.2514/1.j051741

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…The boundary element method models the outer domain, but requiring the fictitious surface to be meshed, modelling the uniform flow and the radiation condition from the boundary and into the far-field. There are several reported implementations and aero-acoustic and related applications of these methods [307,[314][315][316][317][318][319][320][321][322][323][324][325][326].…”

Section: Aero-acousticsmentioning

confidence: 99%

The Boundary Element Method in Acoustics: A Survey

Kirkup

2019

Applied Sciences

102

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The boundary element method (BEM) in the context of acoustics or Helmholtz problems is reviewed in this paper. The basis of the BEM is initially developed for Laplace’s equation. The boundary integral equation formulations for the standard interior and exterior acoustic problems are stated and the boundary element methods are derived through collocation. It is shown how interior modal analysis can be carried out via the boundary element method. Further extensions in the BEM in acoustics are also reviewed, including half-space problems and modelling the acoustic field surrounding thin screens. Current research in linking the boundary element method to other methods in order to solve coupled vibro-acoustic and aero-acoustic problems and methods for solving inverse problems via the BEM are surveyed. Applications of the BEM in each area of acoustics are referenced. The computational complexity of the problem is considered and methods for improving its general efficiency are reviewed. The significant maintenance issues of the standard exterior acoustic solution are considered, in particular the weighting parameter in combined formulations such as Burton and Miller’s equation. The commonality of the integral operators across formulations and hence the potential for development of a software library approach is emphasised.

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Section: Aero-acousticsmentioning

confidence: 99%

The Boundary Element Method in Acoustics: A Survey

Kirkup

2019

Applied Sciences

102

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“…Hence, the incident pressure produced by the quadrupole is equivalent to the double spatial derivative of the harmonic freefield Green's function (Eq. (5)) and is given by [18,37] …”

Section: Case Study Amentioning

confidence: 99%

Boundary element solution for periodic acoustic problems

Karimi

Croaker

Kessissoglou

2016

Journal of Sound and Vibration

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“…[2][3][4][5][6][7] The LES simulations are able to capture the fluctuating flow noise sources with great detail over a wide range of frequencies. [2][3][4][5][6][7] The LES simulations are able to capture the fluctuating flow noise sources with great detail over a wide range of frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid large eddy simulation (LES)-acoustic analogy techniques have been developed that provide a high-fidelity approach to predict the flow induced noise from a body submerged in the flow. [2][3][4][5][6][7] The LES simulations are able to capture the fluctuating flow noise sources with great detail over a wide range of frequencies. An incompressible large eddy simulation was performed by Wang and Moin 2 to simulate turbulent flow over a flat strut, with the predicted hydrodynamics comparing well with experimental results reported by Blake.…”

Section: Introductionmentioning

confidence: 99%

“…33 For all cases, the predicted radiated sound field matched well with experimental measurements. Croaker et al 5 presented a particle accelerated hybrid CFD-BEM technique to predict low Mach number flow-induced noise, the scattering of this noise by a body immersed in the flow, and the resulting far-field sound pressure. The hybrid CFD-BEM technique was performed to predict the vortex shedding sound waves scattered by a two-dimensional cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Numerical prediction of turbulent boundary layer noise from a sharp‐edged flat plate

Karimi

Croaker

Skvortsov

et al. 2019

Numerical Methods in Fluids

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Summary An efficient hybrid uncorrelated wall plane waves–boundary element method (UWPW‐BEM) technique is proposed to predict the flow‐induced noise from a structure in low Mach number turbulent flow. Reynolds‐averaged Navier‐Stokes equations are used to estimate the turbulent boundary layer parameters such as convective velocity, boundary layer thickness, and wall shear stress over the surface of the structure. The spectrum of the wall pressure fluctuations is evaluated from the turbulent boundary layer parameters and by using semi‐empirical models from literature. The wall pressure field underneath the turbulent boundary layer is synthesized by realizations of uncorrelated wall plane waves (UWPW). An acoustic BEM solver is then employed to compute the acoustic pressure scattered by the structure from the synthesized wall pressure field. Finally, the acoustic response of the structure in turbulent flow is obtained as an ensemble average of the acoustic pressures due to all realizations of uncorrelated plane waves. To demonstrate the hybrid UWPW‐BEM approach, the self‐noise generated by a flat plate in turbulent flow with Reynolds number based on chord Rec = 4.9 × 105 is predicted. The results are compared with those obtained from a large eddy simulation (LES)‐BEM technique as well as with experimental data from literature.

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Fast Low-Storage Method for Evaluating Lighthill’s Volume Quadrupoles

Cited by 16 publications

References 30 publications

The Boundary Element Method in Acoustics: A Survey

The Boundary Element Method in Acoustics: A Survey

Boundary element solution for periodic acoustic problems

Numerical prediction of turbulent boundary layer noise from a sharp‐edged flat plate

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