Numerical Coupling Strategy for Resolving In-Duct Elastic Panel Aeroacoustic/Structural Interaction

Fan, Harris K. H.; Leung, R. C. K.; Lam, Garret C. Y.; Aurégan, Yves; Dai, Xiwen

doi:10.2514/1.j057324

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…where w is the panel displacement from its undisturbed position, S P is the panel bending stiffness, T P is the external tensile stress in tangential direction, h P is thickness of panel, N P is the internal tensile stress in the tangential direction, C P is the structural damping coefficient of the panel, K P is the stiffness of the foundation supporting the panel and p ex is the net pressure acting across panel surfaces [7]. The nonlinear coupling between aeroacoustic fluctuation and panel structural dynamics is resolved with a monolithic scheme [19].…”

Section: Problem Setup and Numerical Methodologymentioning

confidence: 99%

Reduction of Flow-Induced Trailing Edge Noise of Semi-Infinite Flat Plate by Structural Resonance

ARIF,

LEUNG,

NASEER

et al. 2023

inter noise

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A unique method for the reduction in flow-induced trailing edge noise scattering for a semi-infinite thin plate is proposed by utilizing short flexible panels mounted on the surface of the plate. The proposed configuration differs from conventional cantilevered elastic trailing edges due to the limitations of their structural integrity and applicability. The key idea is to design short panels that vibrate in structural resonance under the fluid loading for absorbing the energy from the flow to sustain their vibration. A time-domain direct aeroacoustic simulation coupled with structural dynamics is carried out at a low Reynolds number of 50,000 to explore the aeroacoustic-structural interactions. The effectiveness of noise reduction of the designed configuration is analyzed by comprehensive aeroacoustic analysis where a significant noise reduction is observed for the plate mounted with three flexible panels without any adverse effects on the plate aerodynamics. The structural analysis shows a systematic vibration pattern for all the panels which clearly indicates the presence of complex fluid-structural interaction under resonance conditions. Design strategy of the proposed configuration along with its limitations are also discussed.

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Section: Problem Setup and Numerical Methodologymentioning

confidence: 99%

Reduction of Flow-Induced Trailing Edge Noise of Semi-Infinite Flat Plate by Structural Resonance

ARIF,

LEUNG,

NASEER

et al. 2023

inter noise

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show abstract

“…where 𝐷 𝐸𝑃 = 𝐷 ̂𝐸𝑃 /(𝜌 ̂0𝑢 ̂0 2) is solved by the standard finite difference method. The nonlinear coupling between aeroacoustic fluctuation and panel structural dynamics is resolved with a monolithic scheme developed by Fan et al (2018), which treats the fluid-panel system as a This is the author's peer reviewed, accepted manuscript. However, the online version of record will be different from this version once it has been copyedited and typeset.…”

Section: B Structural Solver and Aeroacoustic-structural Couplingmentioning

confidence: 99%

Suppression of deep cavity aeroacoustics at low Mach number by localized surface compliance

et al. 2023

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A unique concept of utilizing localized surface compliance is proposed to suppress deep cavity aeroacoustics at a low Mach number. The core idea is to provide local absorption of the energy of aeroacoustic processes supporting cavity flow self-sustained feedback loop responsible for tonal noise generation. The concept is studied with a flow past cavity of length-to-depth ratio of 0.4 at freestream Mach number 0.09 and Reynolds number based on cavity length 4 × 104 using high-fidelity, two-dimensional direct aeroacoustic simulation. Having confirmed the replication of key aeroacoustic processes in the numerical solution through careful validation, localized surface compliance in the form of an elastic panel is strategically introduced to modify every process for cavity noise suppression. The panel natural frequency is set equal to the feedback loop characteristic frequency to facilitate its flow-induced structural resonance for energy absorption. Suppression of cavity noise pressure and power levels by 3.8 and 4.8 dB, respectively, is successfully achieved, together with an unforeseen cavity drag reduction by almost 19%. Comprehensive wavenumber–frequency analyses of the coupled aeroacoustics and flow-induced panel vibration are conducted to uncover the physical mechanism of noise suppression. The results show that the same type of aeroacoustic feedback loop occurs, but its efficacy is significantly reduced due to the exhaustion of aeroacoustic process energy to the flow-induced vibrating panel. The proposed concept is confirmed to be feasible in terms of giving remarkable cavity noise and drag suppression, yet it retains the basic problem geometry intact, which are considered important in many practical applications.

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“…Most of the previous numerical works adopt a frequency-domain approach which may not reveal the nonlinear details of noise mitigation mechanism easily. In the present study, we adopt Direct Aeroacoustic Simulation (DAS) approach combined with a monolithic approach for incorporating the panel structural dynamics into time marching of solution [16,17]. DAS is a time-domain numerical approach which solves the compressible Navier-Stokes (N-S) equations and the equation of state simultaneously.…”

Section: Numerical Approachmentioning

confidence: 99%

Effect of back cavity configuration on performance of elastic panel acoustic liner with grazing flow

Lam

Leung

Fan

et al. 2021

Journal of Sound and Vibration

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Numerical Coupling Strategy for Resolving In-Duct Elastic Panel Aeroacoustic/Structural Interaction

Cited by 15 publications

References 13 publications

Reduction of Flow-Induced Trailing Edge Noise of Semi-Infinite Flat Plate by Structural Resonance

Reduction of Flow-Induced Trailing Edge Noise of Semi-Infinite Flat Plate by Structural Resonance

Suppression of deep cavity aeroacoustics at low Mach number by localized surface compliance

Effect of back cavity configuration on performance of elastic panel acoustic liner with grazing flow

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