Aeroacoustic integral methods, formulation and efficient numerical implementation

Prieur, Jean; Rahier, Gilles

doi:10.1016/s1270-9638(01)01123-3

Cited by 97 publications

(48 citation statements)

References 6 publications

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“…The difference in results between the FW-H method and the Kirchhoff method has been found to be depend on the surface location [7,15,16]. A surface in the source region will produce higher differences than a surface in the acoustic propagation region.…”

Section: Specification Of Integral Surfacementioning

confidence: 99%

“…The applications of the Kirchhoff method have been discussed in the literature [12][13][14]. Contrary to the Kirchhoff method, the analytical solution of the FW-H method involves the nonlinear effects on and outside the integral surface [7,15,16]. Theoretical and numerical differences have been evaluated to predict the noise from, for example, helicopter rotors [6,7,15,16] and jets [17].…”

Section: Introductionmentioning

confidence: 99%

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Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

et al. 2014

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Three surface integral approaches of the acoustic analogies are studied to predict the noise from three conceptual configurations of three-dimensional high-lift low-noise wings. The approaches refer to the Kirchhoff method, the Ffowcs Williams and Hawkings (FW-H) method of the permeable integral surface and the Curle method that is known as a special case of the FW-H method. The first two approaches are used to compute the noise generated by the core flow region where the energetic structures exist. The last approach is adopted to predict the noise specially from the pressure perturbation on the wall. A new way to construct the integral surface that encloses the core region is proposed for the first two methods. Considering the local properties of the flow around the complex object-the actual wing with high-lift devices-the integral surface based on the vorticity is constructed to follow the flow structures. The surface location is discussed for the Kirchhoff method and the FW-H method because a common surface is used for them. The noise from the core flow region is studied on the basis of the dependent integral quantities, which are indicated by the Kirchhoff formulation and by the FW-H formulation. The role of each wall component on noise contribution is analyzed using the Curle formulation. Effects of the volume integral terms of Lighthill's stress tensors on the noise preThe project was supported by the Clean Sky Joint Undertaking (CSJU) (diction are then evaluated by comparing the results of the Curle method with the other two methods.

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Section: Specification Of Integral Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

et al. 2014

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“…The aeroacoustic integral method relies on the Ffowcs-Williams and Hawkings equation [40], in its rotating solid surface formulation, as implemented in the KIM solver [41]. The solid surface is the blade in rotation, during its last rotation.…”

Section: Numerical Setupmentioning

confidence: 99%

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Zehner¹,

Falissard²,

Gloerfelt

2016

22nd AIAA/CEAS Aeroacoustics Conference

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The aeroacoustic response of the orthogonal interaction of a rotating blade with an isolated Batchelor vortex is studied by means of numerical simulation. The relative influence of the vortex tangential and axial velocity on the blade aerodynamics and on the acoustics radiated in the far-field is analyzed by comparing the interaction with a Batchelor vortex to the interactions considering the vortex tangential or axial velocity components. Analyses show that the vortex tangential velocity contributes mostly to the noise level at low frequencies, whereas the vortex axial velocity is responsible for the contribution at high frequencies. For the range of frequencies in between, the interaction noise results from constructive interferences of the noise radiated separately by each velocity component of the vortex.

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“…6,14,15 The differences have been evaluated numerically to predict the noise from, for example, helicopter rotors 5,6,15 and jets.…”

Section: -13mentioning

confidence: 99%

“…This is an advantage since it brings less limitation on the location of the surface. 6,14,15 The surface can be placed in the area where nonlinear effects exist. That is, the distance can be closer to the walls or the intensive flow area in the FWH method than the Kirchhoff method.…”

Section: Iic Definition Of the Integral Surfacementioning

confidence: 99%

Surface Integral Analogy Approaches to Computing Noise Generated by a 3D High-Lift Wing Configuration

Yao

Davidson

Eriksson

et al. 2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Three surface integral approaches of the acoustic analogies are studied to predict the noise from a three-dimensional, high-lift wing configuration. The approaches refer to the Kirchhoff method, the Ffowcs Williams and Hawkings method of the permeable integral surface and the Curle method. The first two approaches are used to compute the noise generated by the core flow region where the energetic structures exist. The last approach is adopted to predict the noise specifically from the pressure perturbation on the wall. A new way to construct the integral surface that encloses the core region is proposed for the first two methods. Considering the local properties of the flow around the complex objective -the actual wing with high-lift devices -the integral surface based on the vorticity is constructed to follow the flow structures. The noise from the core flow region is based on the dependent integral quantities, which are indicated by the Kirchhoff formulation and by the FWH formulation. The role of each wall component on noise contribution is analyzed using the Curle method. The results of the three methods are then compared.

show abstract

Aeroacoustic integral methods, formulation and efficient numerical implementation

Cited by 97 publications

References 6 publications

Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Surface Integral Analogy Approaches to Computing Noise Generated by a 3D High-Lift Wing Configuration

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