Computational aeroacoustics - Issues and methods

Tam, Christopher K. W.

doi:10.2514/3.12728

Cited by 437 publications

(122 citation statements)

References 25 publications

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“…Apart from the DNS and LES of turbulence, computational aeroacoustics (CAA) is another area where high resolution schemes are highly demanded for the simulation of waves with large spectral bandwidth and amplitude disparity [3]. For an imperfectly expanded supersonic jet, the Strouhal number ranges from 10 −2 to 10 1 .…”

mentioning

confidence: 99%

High resolution conjugate filters for the simulation of flows

Zhou

Wang

2003

Journal of Computational Physics

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This paper proposes a Hermite-kernel realization of the conjugate filter oscillation reduction (CFOR) scheme for the simulation of fluid flows. The Hermite kernel is constructed by using the discrete singular convolution (DSC) algorithm, which provides a systematic generation of low-pass filter and its conjugate high-pass filters. The high-pass filters are utilized for approximating spatial derivatives in solving flow equations, while the conjugate low-pass filter is activated to eliminate spurious oscillations accumulated during the time evolution of a flow. As both low-pass and high-pass filters are derived from the Hermite kernel, they have similar regularity, time-frequency localization, effective frequency band and compact support. Fourier analysis indicates that the CFOR-Hermite scheme yields a nearly optimal resolution and has a better approximation to the ideal low-pass filter than previously CFOR schemes.Thus, it has better potential for resolving natural high frequency oscillations from a shock. Extensive one-and two-dimensional numerical examples, including both incompressible and compressible flows, with or without shocks, are employed to explore the utility, test the resolution, and examine the stability of the present CFOR-Hermite scheme. Extremely small ratio of point- * Corresponding author 1 per-wavelength (PPW) is achieved in solving the Taylor problem, advancing a wavepacket and resolving a shock/entropy wave interaction. The present results for the advection of an isentropic vortex compare very favorably to those in the literature.

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confidence: 99%

High resolution conjugate filters for the simulation of flows

Zhou

Wang

2003

Journal of Computational Physics

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“…These spectra are plotted for the range [0. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Far Field Pressurementioning

confidence: 99%

“…The jet development is strongly linked to the initial turbulent or laminar shear layer state, as observed by Zaman [9], the latter leading to additional noise. Non-reflecting conditions are required at lateral and outflow boundaries to model the free-field conditions and to avoid spurious noise contamination of the physical sound field [14]. For a detailed review of available numerical boundary conditions for aeroacoustic simulations, the reader may refer to Tam [15].…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation and Far Field Acoustics of a Subsonic Hot Jet

Labbé¹

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…If the SBP property and the semi-boundedness for the dissipation both hold in the same scalar product, we take the scalar product with wj, and obtain [4], the so called DRP scheme [14], and a second-order accurate MUSCL TVD scheme (IVIUSCL-RK2)…”

Section: High Ordermentioning

confidence: 99%