Numerical Predictions of Turbulence-Cascade Interaction Noise Using CAA with a Stochastic Model

Clair, Vincent; Polacsek, Cyril; Garrec, Thomas Le; Jacob, Marc C.

doi:10.2514/6.2014-2453

Cited by 2 publications

(3 citation statements)

References 26 publications

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“…For that purpose, as suggested in conclusions of Ref. [11], the code sAbrinA.v0 has been modified to speed up the turbulent-like flow generation process by externalizing part of the source terms (read from an input data file) involved in Tam's inflow boundary condition 8,14 . By this way, the CPU time involved for the generation of the turbulence is negligible compared to the CAA (only source-term derivatives of Tam's BC are numerically calculated in the code), so that the total CPU time for the complete spectrum (kr ≠ 0) is comparable.…”

Section: A4 T2-c2 Simulationmentioning

confidence: 99%

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Numerical Predictions of Turbulence/Cascade-Interaction Noise Using Computational Aeroacoustics with a Stochastic Model

et al. 2015

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Turbulent flow interactions with the outlet guide vanes are known to mainly contribute to broadband noise emission of aeroengines at approach conditions. This paper presents a 3D CAA hybrid method aiming at simulating the aeroacoustic response of an annular cascade impacted by a prescribed homogeneous isotropic turbulent flow. It is based on a time-domain Euler solver coupled to a synthetic turbulence model implemented in the code by means of a suited inflow boundary condition. The fluctuating pressure over the airfoil surface provided by CAA is used as an input to a Ffowcs-Williams and Hawkings integral method to calculate the radiated sound field. Euler computations are first validated against an academic CAA benchmark in the case of an harmonic gust interacting with an annular flat plate cascade. Then, simulations are applied to turbulence-cascade interactions for annular configurations, in uniform and swirling mean flows, and numerical results in terms of sound power spectra in the outlet duct are compared to semi-analytical and numerical solutions, and to an available experiment.

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Section: A4 T2-c2 Simulationmentioning

confidence: 99%

“…Another approach 8 based on a CAA/Euler hybrid methodology coupled to a synthetic turbulence inflow can also be considered, as investigated by recent studies [9][10][11] , and is the object of the present paper.…”

Section: Introductionmentioning

confidence: 99%

Numerical Predictions of Turbulence/Cascade-Interaction Noise Using Computational Aeroacoustics with a Stochastic Model

et al. 2015

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“…Turbulent flow interactions with the outlet guide vanes are known to mainly contribute to broadband noise emission of aeroengines at approach conditions. Onera has developed [11] a 3D CAA hybrid method for the simulation of the aeroacoustic response of an annular cascade impacted by a prescribed homogeneous isotropic turbulent flow. It is based on a time-domain Euler solver coupled to a synthetic turbulence model generating a suited inflow boundary condition.…”

Section: Numerical Predictions Of Turbulence-cascade Interaction Noismentioning

confidence: 99%

Aeroacoustics research in Europe: The CEAS-ASC report on 2014 highlights

Detandt¹

2015

Journal of Sound and Vibration

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The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests of the scientific and industrial aeroacoustics community on an European scale and European aeronautics activities internationally. Each year the committee highlights some of the research and development projects in Europe. This paper is the 2014 issue of this collection of Aeroacoustic Highlights, compiled from informations submitted to the CEAS-ASC. The contributions are classified in different topics; the first categories being related to specific aeroacoustic challenges (airframe noise, fan and jet noise, helicopter noise, aircraft interior noise) and two last sections are respectively devoted to recent improvements and emerging techniques and to general advances in aeroacoustics. For each section, the present paper focus on accomplished projects, providing the state of the art in each research category in 2014. A number of research programmes involving aeroacoustics were funded by the European Commission. Some of the highlights from these programmes are summarised in this paper, as well as highlights funded by national programmes or by industry.

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Numerical Predictions of Turbulence-Cascade Interaction Noise Using CAA with a Stochastic Model

Cited by 2 publications

References 26 publications

Numerical Predictions of Turbulence/Cascade-Interaction Noise Using Computational Aeroacoustics with a Stochastic Model

Numerical Predictions of Turbulence/Cascade-Interaction Noise Using Computational Aeroacoustics with a Stochastic Model

Aeroacoustics research in Europe: The CEAS-ASC report on 2014 highlights

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