Journal ArticleDOI
Large-Eddy Simulation of Supersonic Cavity Flowfields Including Flow Control
TLDR
In this paper, large-eddy simulations of supersonic cavity flowfields are performed using a high-order numerical method, which employs a time-implicit approximately factored finite difference algorithm, and applies Newton-like subiterations to achieve second-order temporal and fourth-order spatial accuracy.Abstract:
Large-eddy simulations of supersonic cavity flowfields are performed using a high-order numerical method. Spatial derivatives are represented by a fourth-order compact approximation that is used in conjunction with a sixth-order nondispersive filter. The scheme employs a time-implicit approximately factored finite difference algorithm, and applies Newton-like subiterations to achieve second-order temporal and fourth-order spatial accuracy. The Smagorinsky dynamic subgrid-scale model is incorporated in the simulations to account for the spatially underresolved stresses. Computations at a freestream Mach number of 1.19 are carried out for a rectangular cavity having a length-to-depth ratio of 5:1. The computational domain is described by 2.06×10 7 grid points and has been partitioned into 254 zones, which were distributed on individual processors of a massively parallel computing platform. Active flow control is applied through pulsed mass injection at a very high frequency, thereby suppressing resonant acoustic oscillatory modesread more
Citations
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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
Large-Eddy Simulation: Current Capabilities, Recommended Practices, and Future Research
TL;DR: The use of large-eddy simulation (LES) methods for calculation of turbulent flows has increased substantially in recent years as discussed by the authors, and the availability of LES and hybrid Reynolds-averaged Navier-Stokes (RANS)/LES in general-purpose codes is discussed.
Journal ArticleDOI
Three-dimensional instabilities in compressible flow over open cavities
Guillaume A. Brès,Tim Colonius +1 more
TL;DR: In this article, a linear stability analysis is conducted to search for three-dimensional global instabilities of the 2D mean flow for cavities that are homogeneous in the spanwise direction.
Journal ArticleDOI
Localized artificial diffusivity scheme for discontinuity capturing on curvilinear meshes
Soshi Kawai,Sanjiva K. Lele +1 more
TL;DR: A simple and efficient localized artificial diffusivity scheme is developed for the purpose of capturing discontinuities on curvilinear and anisotropic meshes using a high-order compact differencing scheme and shows any major detrimental effect on the discontinuity capturing under the conditions examined.
Journal ArticleDOI
Review of numerical simulations for high-speed, turbulent cavity flows
S. J. Lawson,George N. Barakos +1 more
TL;DR: In this article, a detailed overview of the current status of the experimental and computational progress over the past twenty years is summarised in this paper, along with a summary of these methods.
References
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A dynamic subgrid‐scale eddy viscosity model
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An Implicit Factored Scheme for the Compressible Navier-Stokes Equations
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A dynamic subgrid‐scale model for compressible turbulence and scalar transport
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A diagonal form of an implicit approximate-factorization algorithm
Thomas H. Pulliam,D.S Chaussee +1 more
TL;DR: The modification transforms the coupled system of equations into an uncoupled diagonal form that requires less computational work and has an important effect on the application of implicit finite-difference schemes to vector processors.