Bluff Body Wakes Dynamics And Instabilities PDF Download
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Author | : Helmut Eckelmann |
Publisher | : Springer Science & Business Media |
Total Pages | : 390 |
Release | : 2013-11-11 |
Genre | : Science |
ISBN | : 3662004143 |
Download Bluff-Body Wakes, Dynamics and Instabilities Book in PDF, ePub and Kindle
Bluff-body wakes play an important role in many fluid dynamics problems and engineering applications. This book gives and up-to-date account of recent results obtained in the study of bluff-body wakes. Experimental, theoretical and numerical approaches are all comprehensively covered and compared. Topics of particular interest include hydrodynamic instability analyses, three-dimensional pattern formation problems, flow control methods, bifurcation analyses, numerical simulations and turbulence modelling. The main originality of thisvolume is that recent conceptual advances made to describe nonlinear phenomena in general are put to the test on a classical problem in fundamental fluid mechanics, namely the wake structure generated behind a bluff object.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2005 |
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Download รายงานผลการสํารวจข้าวนาปรังปี 2547 Book in PDF, ePub and Kindle
Author | : National Research Council |
Publisher | : National Academies Press |
Total Pages | : 1100 |
Release | : 1997-09-11 |
Genre | : Science |
ISBN | : 0309058791 |
Download Twenty-First Symposium on Naval Hydrodynamics Book in PDF, ePub and Kindle
Author | : Negar Nabatian |
Publisher | : |
Total Pages | : 143 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Dynamics and Control of Bluff-body-wake-structure Interaction Book in PDF, ePub and Kindle
Fluid-structure interaction is encountered in most of the engineering and industrial flow applications. The interaction can lead to generation of undesirable forces acting on structures and causing fatigue or damage. One approach to understanding the fundamental wake flow dynamics and stability is to conduct simulations using forced oscillation of a cylinder. Two aspects of such a flow are considered. The first is the dependence of vortex shedding pattern symmetries on the forced oscillation amplitude, forcing frequency ratios and the direction of the oscillation relative to flow direction. The forced oscillation, depending on the amplitude and frequency of the oscillation, causes formation of various patterns which have specific symmetries. Numerical simulations and stability analysis are employed to determine the unstable wake flow modes and their bifurcations. The forced inline oscillation of a circular cylinder is studied to predict the wake modes over a prescribed range of amplitudes and frequencies. The two-dimensional numerical computations of the Navier-Stokes equations are performed using forced periodic boundary condition method in the range of forcing-to-shedding frequency ratios / [1 2] e s f f ; covering the harmonic and superharmonic excitation regimes with amplitude ratio in the range A/ DÎ[0-0.5]. Symmetric and asymmetric lock-on modes are observed for three different oscillation amplitudes and frequency ratios. The asymmetric 2S mode when / 1 e s f f = for A/D=[0.35-0.5], P+S mode at / 1.5 e s f f = for A/D=[0.175,0.5] and S mode at / 2 e s f f = for A/D=[0.175,0.5] are confirmed. Due to the nonlinearity of the Navier-Stokes équations and the complexity of the infinite dimensional flow dynamics, the primary modes are calculated by the proper orthogonal decomposition (POD) tool. A Galerkin procedure is the used to project the Navier-Stokes equations onto a low-dimensional space spanned by the first two POD modes. This method reduces the problem size from an infinite-dimensional space to a finite number of modes (degree-offreedom)representing the wake dynamics. The vortex shedding dominant modes are invariant Under their symmetry groups. The equivariant bifurcation theory is employed to develop the low order model using the symmetry properties of the primary modes. Thus, equivariant bifurcation and normal form theories are combined with numerical computations of the Navier-Stokes equations to precisely describe the spatio-temporal properties of the wake flow modes and their bifurcations. A linear analysis of the analytical low order model near the bifurcation point is performed to predict the bifurcation sequences observed in simulations.
Author | : Sunil Kumar Reddy Patil |
Publisher | : |
Total Pages | : 402 |
Release | : 2007 |
Genre | : Hydrodynamics |
ISBN | : |
Download Numerical Study of a Hydrodynamic Instability Excitation for Bluff Body Wake Control Book in PDF, ePub and Kindle
Author | : Akiva M. Yaglom |
Publisher | : Springer Science & Business Media |
Total Pages | : 611 |
Release | : 2012-12-18 |
Genre | : Technology & Engineering |
ISBN | : 9400742371 |
Download Hydrodynamic Instability and Transition to Turbulence Book in PDF, ePub and Kindle
This book is a complete revision of the part of Monin & Yaglom's famous two-volume work "Statistical Fluid Mechanics: Mechanics of Turbulence" that deals with the theory of laminar-flow instability and transition to turbulence. It includes the considerable advances in the subject that have been made in the last 15 years or so. It is intended as a textbook for advanced graduate courses and as a reference for research students and professional research workers. The first two Chapters are an introduction to the mathematics, and the experimental results, for the instability of laminar (or inviscid) flows to infinitesimal (in practice "small") disturbances. The third Chapter develops this linear theory in more detail and describes its application to particular problems. Chapters 4 and 5 deal with instability to finite-amplitude disturbances: much of the material has previously been available only in research papers.
Author | : Tim C. Lieuwen |
Publisher | : Cambridge University Press |
Total Pages | : 534 |
Release | : 2021-10-21 |
Genre | : Technology & Engineering |
ISBN | : 1108896855 |
Download Unsteady Combustor Physics Book in PDF, ePub and Kindle
Explore a unified treatment of the dynamics of combustor systems, including acoustics, fluid mechanics, and combustion in a single rigorous text. This updated new edition features an expansion of data and experimental material, updates the coverage of flow stability, and enhanced treatment of flame dynamics. Addresses system dynamics of clean energy and propulsion systems used in low emissions systems. Synthesizing the fields of fluid mechanics and combustion into a coherent understanding of the intrinsically unsteady processes in combustors. This is a perfect reference for engineers and researchers in fluid mechanics, combustion, and clean energy.
Author | : S. Ziada |
Publisher | : CRC Press |
Total Pages | : 863 |
Release | : 2000-01-01 |
Genre | : Science |
ISBN | : 1482283743 |
Download Flow-Induced Vibration Book in PDF, ePub and Kindle
Flow-induced vibrations and noise continue to cause problems in a wide range of engineering applications ranging from civil engineering and marine structures to power generation and chemical processing. These proceedings bring together more than a hundred papers dealing with a variety of topics relating to flow-induced vibration and noise. The cont
Author | : M. P. Paidoussis |
Publisher | : |
Total Pages | : 280 |
Release | : 1992 |
Genre | : Fluid dynamics |
ISBN | : |
Download Bluff-body/fluid and Hydraulic Machine Interactions Book in PDF, ePub and Kindle
Author | : United States. Office of Naval Research |
Publisher | : |
Total Pages | : 88 |
Release | : 1992 |
Genre | : Research |
ISBN | : |
Download Office of Naval Research Guide to Programs Book in PDF, ePub and Kindle