Investigation of Integral Surface Formulations for Acoustic Predictions of Hot Jets Starting from Unsteady Aerodynamic Simulations

Rahier, Gilles; Prieur, Jean; Vincent, François; Lupoglazoff, Nicolas; Biancherin, Anthoine

doi:10.2514/6.2003-3164

Cited by 24 publications

(22 citation statements)

References 6 publications

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“…Similar treatment is reported in the literature on jet noise [13,47]. However, it results in inaccurately predicted noise in the downstream direction.…”

Section: Specification Of Integral Surfacesupporting

confidence: 76%

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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“…Similar treatment is reported in the literature on jet noise [13,47]. However, it results in inaccurately predicted noise in the downstream direction.…”

Section: Specification Of Integral Surfacesupporting

confidence: 76%

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

et al. 2014

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“…Our numerical experiments show that increasing the length of the FWH surface from 59r 0 to 80r 0 , predicts OASPL in closer agreement with the experiments for these observer locations. Similar trends were seen with the heated jet results of Rahier et al [70], although their maximum streamwise control surface extent was 48r 0 . For the f 3 control surface results shown in figure 9, the TVD and WENO filter peak values are surprisingly close, with the TVD filter levels dropping more rapidly than the WENO filter results at large angles.…”

Section: Farfield Acousticssupporting

confidence: 88%

Numerical Investigation of 3-D Supersonic Jet Flows Using Large-Eddy Simulation

Aikens

Blaisdell

et al. 2012

International Journal of Aeroacoustics

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The farfield noise generated by supersonic jets is investigated by a computational aeroacoustics methodology that couples 3-D large-eddy simulation (LES) near field data with the Ffowcs Williams-Hawkings method for farfield noise prediction. In order to accurately simulate jets at off-design supersonic conditions, we employ LES with characteristic filters for shock-capturing. This approach limits the dissipation of noise-producing turbulent fluctuations, and is suitable for incorporation into existing solvers. To further limit dissipation, a shock detector is used to determine shock locations and characteristic filters are applied locally. In this study, both perfectly-expanded and under-expanded unheated jets are investigated, with and without using characteristic filters. Comparisons with similar numerical and experimental data show reasonable agreement of the jet mean flow, turbulent statistics, and acoustics results. Preliminary grid-refinement shows improvement in these results.

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“…Surface integral methods such as Kirchhoff [13] or Ffowcs Williams-Hawkings (FWH) [14] methods (with volumetric source terms, corresponding to the presence of quadrupoles outside the surface, neglected) rely on near-field information gathered over a surface enclosing as much as possible the noise sources. The latter methods, owing to their simplicity, their limited cost and their success (when coupled with LES) in predicting the noise emitted by high-speed jets, are very popular in the jet noise LES community [5,8,11,[15][16][17][18][19][20]. The FWH method is generally preferred over the Kirchhoff method: Kirchhoff methods provide accurate results when the surface is placed in the linear acoustic region, which forces the LES grid to be fine even outside of the turbulent region [5,11,21].…”

Section: Motivation and Objectivesmentioning

confidence: 99%

On the Use of the Ffowcs Williams-Hawkings Equation to Predict Far-Field Jet Noise from Large-Eddy Simulations

Mendez

Shoeybi

Lele

et al. 2013

International Journal of Aeroacoustics

116

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This study presents best practices for the use of the permeable-surface Ffowcs Williams-Hawkings equations to calculate far-field sound from large-eddy simulations of high-speed turbulent jets. A parametric study of the Ffowcs Williams-Hawkings equations is performed by post-processing existing large-eddy simulations at different operating conditions gathering subsonic, supersonic, cold, isothermal, and heated jets. It is concluded that using the pressure formulations of the Ffowcs Williams-Hawkings equations yields better results than the density formulation, especially for the heated jet. In terms of surface closure, best results are obtained with closed surfaces, in conjunction with outflow disk averaging, which confirms the results obtained by Spalart and Shur in 2009. This is different from most previous studies, which recommend using open surfaces. In addition, detailed implementation information and quantified technical recommendations are presented as a guideline for post-processing large-eddy simulations for jet noise. † Corresponding author. Simon Mendez (smendez@um2.fr), Now in University Montpellier II. I3M, UMR CNRS 5149. 2On the use of the Ffowcs Williams-Hawkings equation to predict far-field jet noise from large-eddy simulations

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Investigation of Integral Surface Formulations for Acoustic Predictions of Hot Jets Starting from Unsteady Aerodynamic Simulations

Cited by 24 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

Numerical Investigation of 3-D Supersonic Jet Flows Using Large-Eddy Simulation

On the Use of the Ffowcs Williams-Hawkings Equation to Predict Far-Field Jet Noise from Large-Eddy Simulations

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