High-order schemes for predicting computational aeroacoustic propagation with adaptive mesh refinement

Peers, Edward; Huang, Xun

doi:10.1007/s10409-013-0004-7

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…The computational model is LEE. Equations (14) and (15) are solve to predict sound the sound propagation in the fluid medium. On the other hand, we use the following model to predict sound propagation within the cloaking region,…”

Section: Resultsmentioning

confidence: 99%

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Optimized cloaking design in moving fluid based on the scattering analysis method

Zhong

Huang

2014

20th AIAA/CEAS Aeroacoustics Conference

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This work develops a theoretical framework that can analyze acoustic cloak's scattering in a moving fluid. The equivalent sound source induced by the moving fluid local to the cloak is analytically constructed and is then estimated using Born approximation. Far field radiations can thereafter be obtained using the associated Green's function of convected wave equation. The results demonstrate that the proposed analytical method, which might be helpful in the designs and evaluations of cloaking systems, effectively elucidates the key characteristics of relevant physics. The optimized cloaking design based on the theoretical analysis is obtained that can greatly suppress the acoustic scattering.

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Section: Resultsmentioning

confidence: 99%

“…Thus, the sound propagation in ambient fluid (i.e. where r > b) can be described by the linearized Euler equations (LEE): [11][12][13][14] ∂ρ ∂t…”

Section: The Analytical Frameworkmentioning

confidence: 99%

Optimized cloaking design in moving fluid based on the scattering analysis method

Zhong

Huang

2014

20th AIAA/CEAS Aeroacoustics Conference

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“…The sound field is calculated using the in-house acoustic code 11 with fourth-order low-dispersion and lowdissipation computational methods. [34][35][36] A tenth-order filter is used throughout the computational grids to remove spurious numerical waves developing during the computation. 34 A single-side tenth-order filter 37 is performed at the grid points local to and on the lined wall.…”

Section: B Computational Set-up and Numerical Instabilitymentioning

confidence: 99%

“…[34][35][36] A tenth-order filter is used throughout the computational grids to remove spurious numerical waves developing during the computation. 34 A single-side tenth-order filter 37 is performed at the grid points local to and on the lined wall. The resolution of the computational mesh ensures at least 10 points-perwavelength.…”

Section: B Computational Set-up and Numerical Instabilitymentioning

confidence: 99%

Stability analysis and design of time-domain acoustic impedance boundary conditions for lined duct with mean flow

Liu¹,

Huang²,

Zhang³

2014

The Journal of the Acoustical Society of America

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This work develops the so-called compensated impedance boundary conditions that enable stable time domain simulations of sound propagation in a lined duct with uniform mean flow, which has important practical interest for noise emission by aero-engines. The proposed method is developed analytically from an unusual perspective of control that shows impedance boundary conditions act as closed-loop feedbacks to an overall duct acoustic system. It turns out that those numerical instabilities of time domain simulations are caused by deficient phase margins of the corresponding control-oriented model. A particular instability of very low frequencies in the presence of steady uniform background mean flow, in addition to the well known high frequency numerical instabilities at the grid size, can be identified using this analysis approach. Stable time domain impedance boundary conditions can be formulated by including appropriate phaselead compensators to achieve desired phase margins. The compensated impedance boundary conditions can be simply designed with no empirical parameter, straightforwardly integrated with ordinary linear acoustic models, and efficiently calculated with no need of resolving sheared boundary layers. The proposed boundary conditions are validated by comparing against asymptotic solutions of spinning modal sound propagation in a duct with a hard-soft interface and reasonable agreement is achieved.

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Design method for an acoustic cloak in flows by topology optimization

Stalnov

Huang

2019

Acta Mech. Sin.

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High-order schemes for predicting computational aeroacoustic propagation with adaptive mesh refinement

Cited by 11 publications

References 31 publications

Optimized cloaking design in moving fluid based on the scattering analysis method

Optimized cloaking design in moving fluid based on the scattering analysis method

Stability analysis and design of time-domain acoustic impedance boundary conditions for lined duct with mean flow

Design method for an acoustic cloak in flows by topology optimization

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