Large-eddy Simulation of Laminar-turbulent Breakdown at High Speeds with Dynamic Subgrid-scale Modeling PDF Download
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Author: Nabil M. El-Hady
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Author: Nabil M. El-Hady
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722611972
Category :
Languages : en
Pages : 60
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Book Description
The laminar-turbulent breakdown of a boundary-layer flow along a hollow cylinder at Mach 4.5 is investigated with large-eddy simulation. The subgrid scales are modeled dynamically, where the model coefficients are determined from the local resolved field. The behavior of the dynamic-model coefficients is investigated through both an a priori test with direct numerical simulation data for the same case and a complete large-eddy simulation. Both formulations proposed by Germano et al. and Lilly are used for the determination of unique coefficients for the dynamic model and their results are compared and assessed. The behavior and the energy cascade of the subgrid-scale field structure are investigated at various stages of the transition process. The investigations are able to duplicate a high-speed transition phenomenon observed in experiments and explained only recently by the direct numerical simulations of Pruett and Zang, which is the appearance of 'rope-like' waves. The nonlinear evolution and breakdown of the laminar boundary layer and the structure of the flow field during the transition process were also investigated. El-Hady, Nabil M. Unspecified Center...
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 692
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Author: C. Benocci
Publisher:
ISBN:
Category : Eddies
Languages : en
Pages : 270
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Author: T. J. Chung
Publisher: Cambridge University Press
ISBN: 9780521594165
Category : Juvenile Nonfiction
Languages : en
Pages : 1040
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Book Description
Increasingly, computational fluid dynamics (CFD) techniques are being used to study and solve complex fluid flow and heat transfer problems. This comprehensive book ranges from elementary concepts for the beginner to state-of-the-art CFD for the practitioner. It begins with CFD preliminaries, in which the basic principles of finite difference (FD), finite element (FE), and finite volume (FV) methods are discussed and illustrated through examples, with step-by-step hand calculations. Then, FD and FE methods respectively are covered, including both historical developments and recent contributions. The next section is devoted to structured and unstructured grids, adaptive methods, computing techniques, and parallel processing. Finally, the author describes a variety of practical applications to problems in turbulence, reacting flows and combustion, acoustics, combined mode radiative heat transfer, multiphase flows, electromagnetic fields, and relativistic astrophysical flows. Students and practitioners - particularly in mechanical, aerospace, chemical, and civil engineering - will use this authoritative text to learn about and apply numerical techniques to the solution of fluid dynamics problems.
Author: M. Lesieur
Publisher: Cambridge University Press
ISBN: 9780521781244
Category : Mathematics
Languages : en
Pages : 240
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Book Description
Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.
Author:
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 182
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Author:
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ISBN:
Category :
Languages : en
Pages : 1686
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 722
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 864
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