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Relevant bibliographies by topics / Time-Harmonic convected acoustics

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Journal articles
Dissertations / Theses
Conference papers

Academic literature on the topic 'Time-Harmonic convected acoustics'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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Journal articles on the topic "Time-Harmonic convected acoustics"

1

Too, Gee-Pinn James, and J. H. Ginsberg. "Cylindrical and Spherical Coordinate Versions of NPE for Transient and Steady-State Sound Beams." Journal of Vibration and Acoustics 114, no. 3 (1992): 420–24. http://dx.doi.org/10.1115/1.2930279.

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The NPE (nonlinear progressive wave equation) and associated computer program is a time-domain representation of acoustic propagation in waveguides that includes the effect of nonlinearity. In that approach a spatial window is initialized with the original waveform and then convected in the primary propagation direction as time evolves. Previous work modified NPE by using cylindrical coordinates to describe a paraxial approximation suitable for axisymmetric sound beams. The present development further modifies NPE by using spherical coordinates. The matter of interfacing it with the cylindrica

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2

ZHAO, Q., P. L. STAAB, D. R. KASSOY, and K. KIRKKOPRU. "Acoustically generated vorticity in an internal flow." Journal of Fluid Mechanics 413 (June 25, 2000): 247–85. http://dx.doi.org/10.1017/s0022112000008454.

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A mathematical model is formulated to describe the initiation and evolution of intense unsteady vorticity in a low Mach number (M), weakly viscous internal flow sustained by mass addition through the sidewall of a long, narrow cylinder. An O(M) axial acoustic velocity disturbance, generated by a prescribed harmonic transient endwall velocity, interacts with the basically inviscid rotational steady injected flow to generate time-dependent vorticity at the sidewall. The steady radial velocity component convects the vorticity into the flow. The axial velocity associated with the vorticity field v

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3

Chaumont-Frelet, T., and S. Nicaise. "Wavenumber explicit convergence analysis for finite element discretizations of general wave propagation problems." IMA Journal of Numerical Analysis 40, no. 2 (2019): 1503–43. http://dx.doi.org/10.1093/imanum/drz020.

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Abstract We analyse the convergence of finite element discretizations of time-harmonic wave propagation problems. We propose a general methodology to derive stability conditions and error estimates that are explicit with respect to the wavenumber $k$. This methodology is formally based on an expansion of the solution in powers of $k$, which permits to split the solution into a regular, but oscillating part, and another component that is rough, but behaves nicely when the wavenumber increases. The method is developed in its full generality and is illustrated by three particular cases: the elast

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4

Sattelmayer, T. "Influence of the Combustor Aerodynamics on Combustion Instabilities From Equivalence Ratio Fluctuations." Journal of Engineering for Gas Turbines and Power 125, no. 1 (2002): 11–19. http://dx.doi.org/10.1115/1.1365159.

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Gas turbine combustors are often susceptible to self-excited oscillations, which lead to unacceptable levels of pressure, velocity, and heat release fluctuations. Although instabilities can occur in systems with locally constant equivalence ratio, it is very important to take into account the influence of equivalence ratio fluctuations, which are generated in the fuel air mixer in the unstable case. These fluctuations are convected into the flame and lead to an additional mechanism for the generation of heat release fluctuations. Moreover, entropy waves are produced in the flame, which travel

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5

Raposo, Henrique, Shahid Mughal, Antoine Bensalah, and Richard Ashworth. "Acoustic-roughness receptivity in subsonic boundary-layer flows over aerofoils." Journal of Fluid Mechanics 925 (August 19, 2021). http://dx.doi.org/10.1017/jfm.2021.658.

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The generation of a viscous–inviscid instability through scattering of an acoustic wave by localised and distributed roughness on the upper surface of a NACA 0012 aerofoil is studied with a time-harmonic compressible adjoint linearised Navier–Stokes approach. This extends previous work by the authors dedicated to flat plate geometries. The key advancement lies in the modelling of the inviscid acoustic field external to the aerofoil boundary layer, requiring a numerical solution of the convected Helmholtz equation in a non-uniform inviscid field to determine the unsteady pressure field on the c

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6

Shao, Mingyu, Lihao He, D. Michael McFarland, Hanbo Jiang, and Shiyi Chen. "Numerical investigation of pitching airfoil subjected to incoming gust." Physics of Fluids 37, no. 5 (2025). https://doi.org/10.1063/5.0266004.

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This work investigates the aerodynamic and acoustic response of a pitching airfoil subjected to time-harmonic gust flows. A low-dissipation and dispersion numerical solver of compressible Navier–Stokes equations was developed with the kinetic energy preserving flux scheme. The incoming gust perturbations were introduced via the momentum source method. Then, the interaction between a gust and a pitching airfoil is subsequently analyzed. In the absence of incoming gusts, the wake of the airfoil is composed of a series of vortex pairs convected downstream, while the lift and drag curves exhibit s

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7

"On the estimation of sound produced by complex fluid–structure interactions, with application to a vortex interacting with a shrouded rotor." Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences 433, no. 1889 (1991): 573–98. http://dx.doi.org/10.1098/rspa.1991.0065.

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An approximate analytical method is described for determining the sound produced by a class of complex fluid-structure interactions in low Mach number flows. This can be used to model noise sources in practical systems, and to check the accuracy of predictions based on time accurate numerical solutions of the Navier-Stokes equations. The dominant acoustic sources are dipoles whose strengths are dependent on the unsteady surface forces, and are expressed in terms of fluid velocity and vorticity, and a set of harmonic functions determined by the shapes of the structural elements interacting with

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Dissertations / Theses on the topic "Time-Harmonic convected acoustics"

1

Marchner, Philippe. "Non-reflecting boundary conditions and domain decomposition methods for industrial flow acoustics." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0094.

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Ce travail de thèse est consacré aux méthodes de décomposition de domaine de Schwarz sans recouvrement pour la résolution de problèmes industriels hautes fréquences d'acoustique en écoulement. Les méthodes de résolution en régime harmonique sont difficiles à paralléliser en raison de leur caractère oscillatoire, si bien que les méthodes actuelles sont limitées par une fréquence maximale, imposée par la mémoire disponible de l'ordinateur. Les méthodes de Schwarz sans recouvrement divisent le domaine en sous-domaines d'un point de vue continu et fournissent un cadre approprié en vue d'une parall

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Conference papers on the topic "Time-Harmonic convected acoustics"

1

Sattelmayer, Thomas. "Influence of the Combustor Aerodynamics on Combustion Instabilities From Equivalence Ratio Fluctuations." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0082.

Full text

Abstract:

Gas turbine combustors are often susceptible to self excited oscillations, which lead to unacceptable levels of pressure, velocity and heat release fluctuations. Although instabilities can occur in systems with locally constant equivalence ratio, it is very important to take into account the influence of equivalence ratio fluctuations, which are generated in the fuel air mixer in the unstable case. These fluctuations are convected into the flame and lead to an additional mechanism for the generation of heat release fluctuations. Moreover, entropy waves are produced in the flame, which travel t

APA, Harvard, Vancouver, ISO, and other styles

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