Journal ArticleDOI
Acoustic perturbation equations based on flow decomposition via source filtering
R. Ewert,Wolfgang Schröder +1 more
TLDR
In this paper, a family of acoustic perturbation equations for the simulation of flow-induced acoustic fields in time and space is derived, which are excited by source terms determined from a simulation of the compressible or the incompressible flow problem.About:
This article is published in Journal of Computational Physics.The article was published on 2003-07-01. It has received 584 citations till now. The article focuses on the topics: Acoustic wave equation & Fluid dynamics.read more
Citations
More filters
Journal ArticleDOI
Computational aeroacoustics: progress on nonlinear problems of sound generation
Tim Colonius,Sanjiva K. Lele +1 more
TL;DR: A hierarchy of computational approaches that range from semi-empirical schemes that estimate the noise sources using mean-flow and turbulence statistics, to high-fidelity unsteady flow simulations that resolve the sound generation process by direct application of the fundamental conservation principles is discussed in this paper.
Journal ArticleDOI
Broadband slat noise prediction based on CAA and stochastic sound sources from a fast random particle-mesh (RPM) method
TL;DR: In this paper, a low-cost computational aero-acoustics approach to a slat noise problem is studied, based on the spatial convolution of spatiotemporal white noise and can reproduce target distributions of turbulence kinetic energy and length scales.
Journal ArticleDOI
Acoustic Analogy and Alternative Theories for Jet Noise Prediction
TL;DR: In this paper, several methods for the prediction of jet noise are described, including Lighthill's or Lilley's acoustic analogy, whereas the other is the jet noise generation model recently proposed by Tam and Auriault.
Journal ArticleDOI
On the simulation of trailing edge noise with a hybrid LES/APE method
Roland Ewert,Wolfgang Schröder +1 more
TL;DR: In this article, a hybrid method is applied to predict trailing edge noise based on a large eddy simulation (LES) of the compressible flow problem and acoustic perturbation equations (APE) for the time-dependent simulation of the acoustic field.
Journal ArticleDOI
Linearized perturbed compressible equations for low Mach number aeroacoustics
Jung Hee Seo,Young J. Moon +1 more
TL;DR: The present LPCE ensures grid-independent acoustic solutions by suppressing the generation of perturbed vorticity in the formulation, and is validated for various dipole and quadruple vortex-sound problems at low Mach numbers.
References
More filters
Journal ArticleDOI
On Sound Generated Aerodynamically. I. General Theory
TL;DR: In this paper, a theory for estimating the sound radiated from a fluid flow, with rigid boundaries, which as a result of instability contains regular fluctuations or turbulence is initiated, based on the equations of motion of a gas.
Journal ArticleDOI
Dispersion-relation-preserving finite difference schemes for computational acoustics
TL;DR: In this article, a set of radiation and outflow boundary conditions compatible with the DRP schemes is constructed, and a sequence of numerical simulations is conducted to test the effectiveness of the time-marching dispersion-relation-preserving (DRP) schemes.
Low-dissipation and -dispersion Runge-Kutta schemes for computational acoustics
TL;DR: It is shown that if the traditional Runge?Kutta schemes are used for time advancing in acoustic problems, time steps greatly smaller than those allowed by the stability limit are necessary.
Journal ArticleDOI
Low-Dissipation and Low-Dispersion Runge-Kutta Schemes for Computational Acoustics
TL;DR: In this paper, the authors investigated accurate and efficient time advancing methods for computational acoustics, where nondissipative and nondispersive properties are of critical importance, and proposed low-dissipation and low-dispersion Runge?Kutta (LDDRK) schemes, based on an optimization that minimizes the dissipation and dispersion errors for wave propagation.
Journal ArticleDOI
Contributions to the theory of aerodynamic sound, with application to excess jet noise and the theory of the flute
TL;DR: In this article, a reformulation of the Lighthill (1952) theory of aerodynamic sound is described, and the form of the acoustic propagation operator is established for a non-uniform mean flow in the absence of vortical or entropy gradient source terms.