Trailing edge noise prediction using Large Eddy Simulation and acoustic analogy

Manoha, Eric; Troff, B.; Sagaut, Pierre

doi:10.2514/6.1998-1066

Cited by 15 publications

(21 citation statements)

References 19 publications

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“…For relatively simple geometries, various levels of approximations for Green's functions are possible. For example, the half-plane Green's function (Ffowcs Williams & Hall 1970) has often been used for computing trailing-edge noise (Manoha et al 2000, Wang & Moin 2000 on the basis that the airfoil is long and thin relative to the acoustic wavelengths of interest. However, its deficiency is highlighted in the case of a rectangular strut because the far-field solution depends on the placement of the half-plane relative to the strut (Manoha et al 2000).…”

Section: Effect Of Solid Boundariesmentioning

confidence: 99%

Computational Prediction of Flow-Generated Sound

Wang

Freund

Lele

2006

Annu. Rev. Fluid Mech.

378

174

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This article provides a critical review of computational techniques for flow-noise prediction and the underlying theories. Hybrid approaches, in which the turbulent noise source field is computed and/or modeled separately from the far-field calculation, are afforded particular attention. Numerical methods and modern flow simulation techniques are discussed in terms of their suitability and accuracy for flownoise calculations. Other topics highlighted include some important formulation and computational issues in the application of aeroacoustic theories, generalized acoustic analogies with better accounts of flow-sound interaction, and recent computational investigations of noise-control strategies. The review ends with an analysis of major challenges and key areas for improvement in order to advance the state of the art of computational aeroacoustics.

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Section: Effect Of Solid Boundariesmentioning

confidence: 99%

Computational Prediction of Flow-Generated Sound

Wang

Freund

Lele

2006

Annu. Rev. Fluid Mech.

378

174

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“…Direct numerical simulation ͑DNS͒, 6 unsteady Reynoldsaveraged Navier-Stokes simulations ͑RANS͒, 7 semideterministic modeling ͑SDM͒ 8,9 or, as detailed in this paper, large-eddy simulation ͑LES͒, 10,11 are currently used to compute the acoustic source ͑i.e., the unsteady flow field͒. All the methods described below offer many possibilities but also have some drawbacks: DNS yields a complete representation of the acoustic source term but does not offer the possibility to compute the high Reynolds number turbulent flow that must be dealt with in practice.…”

Section: Introductionmentioning

confidence: 99%

“…In LES calculations only the filtered variables ũ i are known and the exact Lighthill tensor cannot be computed. Lighthill's tensor T i j LES ϭ ũ i ũ j calculated with the basic filtered variables is often used 10,11 and interactions between resolved scales and subgrid scales are not taken into account. Piomelli et al 16 proposed a correction based on LES properties to recover interactions described below and corrected Lighthill's tensor T i j LES by adding the subgrid scale tensor.…”

Section: Introductionmentioning

confidence: 99%

On the radiated noise computed by large-eddy simulation

et al. 2001

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This paper addresses the problem of the estimation of the noise radiated by forced isotropic turbulence using an hybrid large-eddy simulation/Lighthill analogy approach. The scale separation associated with the LES approach leads to splitting the acoustic source term as the sum of several contributions. The subgrid scale and high frequency contributions to radiated acoustic spectrum are first evaluated on the ground of filtered direct numerical simulations. The parametrization of subgrid scale effects based on a scale similarity model is addressed. Both a priori and a posteriori tests demonstrate the efficiency of the proposed model.

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“…In the integral formulation, (2.9) reads as 102 However, if one uses a tailored Green's function, one can solve Lighthill's acoustic analogy directly for the given solid body distribution. [103][104][105][106] This approach is usually limited to simple configurations or numerical methods are used to compute Green's function.…”

Section: From Lighthill's Solution To Ffowcs-williams and Hawkings Anmentioning

confidence: 99%

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Schoder

2019

J. Theor. Comp. Acout.

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This paper collects the state of the art and the tremendous progress that has been made in hybrid modeling of aeroacoustic sound. Hybrid modeling is defined such that flow and acoustics are modeled separate and connected by an aeroacoustic model. The contributions will be classified with respect to the aeroacoustic models being developed, covering Lighthill’s analogy, Ffowcs Williams and Hawkings, vortex sound, linearized Euler equations (LEE), and different perturbation equations modeling flow induced sound. Within each topic, specific applications, such as jet noise, aircraft noise, ground mobility, noise, fan noise and human phonation, are covered. We focus on the accomplishments and provide the authors’ contribution to aeroacoustic research. Eventually, a concise summary of the different methods and their capabilities is included.

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Trailing edge noise prediction using Large Eddy Simulation and acoustic analogy

Cited by 15 publications

References 19 publications

Computational Prediction of Flow-Generated Sound

Computational Prediction of Flow-Generated Sound

On the radiated noise computed by large-eddy simulation

Hybrid Aeroacoustic Computations: State of Art and New Achievements

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