Journal ArticleDOI
Structure of Supersonic Jet Flow and Its Radiated Sound
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In this paper, a high-order numerical scheme is used to perform large-eddy simulations of a supersonic jet flow with emphasis on capturing the time-dependent flow structure representating the sound source.Abstract:
The present paper explores the use of large-eddy simulations as a tool for predicting noise from first principles. A high-order numerical scheme is used to perform large-eddy simulations of a supersonic jet flow with emphasis on capturing the time-dependent flow structure representating the sound source. The wavelike nature of this structure under random inflow disturbances is demonstrated. This wavelike structure is then enhanced by taking the inflow disturbances to be purely harmonic. Application of Lighthill's theory to calculate the far-field noise, with the sound source obtained from the calculated time-dependent near field, is demonstrated. Alternative approaches to coupling the near-field sound source to the far-field sound are discussed.read more
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Journal ArticleDOI
Numerical Treatment of Polar Coordinate Singularities
Kamran Mohseni,Tim Colonius +1 more
TL;DR: In this paper, a method for treating the coordinate singularity whereby singular coordinates are redefined so that data are differentiated smoothly through the pole, and avoiding placing a grid point directly at the pole is proposed.
Journal ArticleDOI
Sound generation by a two-dimensional circular cylinder in a uniform flow
Osamu Inoue,Nozomu Hatakeyama +1 more
TL;DR: In this paper, the sound generated by a circular cylinder in a flow at low Mach numbers is investigated by direct solution of the two-dimensional unsteady compressible Navier-Stokes equations.
Journal ArticleDOI
Surface integral methods in computational aeroacoustics—From the (CFD) near-field to the (Acoustic) far-field
TL;DR: A review of recent advances in the use of surface integral methods in Computational AeroAcoustics (CAA) for the extension of near-field CFD results to the acoustic far-field is given in this paper.
Journal ArticleDOI
Coupling of integral acoustics methods with LES for jet noise prediction
TL;DR: In this paper, a 3D Large Eddy Simulation (LES) code was developed for the far field noise prediction of turbulent jets, which employs state-of-the-art numerical schemes and a localized version of the dynamic Smagorinsky subgrid-scale (SGS) model.
References
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Journal ArticleDOI
General circulation experiments with the primitive equations
TL;DR: In this article, an extended period numerical integration of a baroclinic primitive equation model has been made for the simulation and the study of the dynamics of the atmosphere's general circulation, and the solution corresponding to external gravitational propagation is filtered by requiring the vertically integrated divergence to vanish identically.
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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.
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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.
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A dynamic subgrid‐scale model for compressible turbulence and scalar transport
TL;DR: Germano et al. as discussed by the authors generalized the dynamic subgrid-scale (SGS) model for the large eddy simulation (LES) of compressible flows and transport of a scalar.
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Time-dependent boundary conditions for hyperbolic systems, II
TL;DR: In this article, nonreflecting boundary conditions are defined for multidimensional fluid dynamics problems where waves enter and leave the interior of a domain modeled by hyperbolic equations, and separate equations for each type of incoming and outgoing wave.