Full Simulation Of A Vortex Ring
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Full Simulation Of A Vortex Ring
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Author : Stanford University. Department of Aeronautics and Astronautics
language : en
Publisher:
Release Date : 1986
Full Simulation Of A Vortex Ring written by Stanford University. Department of Aeronautics and Astronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Vortex Ring Models
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Author : Ionut Danaila
language : en
Publisher: Springer Nature
Release Date : 2021-04-16
Vortex Ring Models written by Ionut Danaila and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-16 with Technology & Engineering categories.
This book offers a guide to understanding models of vortex rings, starting from classical ones (circular vortex filament, Hill and Norbury-Fraenkel inviscid models) to very recent models incorporating viscous effects and realistic shapes of the vortex core. Unconfined and confined viscous vortex rings are described by closed formulae for vorticity, stream function, translational velocity, energy, impulse and circulation. Models are applied to predict the formation number of optimal vortex rings and to describe two-phase vortex ring-like structures generated in internal combustion engines. The book provides a detailed presentation of analytical developments of models, backed up by illustrations and systematic comparisons with results of direct numerical simulations. The book is useful for graduate students in applied mathematics, engineering and physical sciences. It is a useful reference for researchers and practising engineers interested in modelling flows with vortex rings.
Numerical Simulation Of A Viscous Vortex Ring Interaction With A Density Interface
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Author :
language : en
Publisher:
Release Date : 1990
Numerical Simulation Of A Viscous Vortex Ring Interaction With A Density Interface written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
When a vortex-dominated flow interacts with a sharp density interface, the dynamics are characterized by the interaction of baroclinically generated vorticity with the already existing vorticity field. This can be seen in many natural and technology settings; examples are the interaction of a ship or submarine wake with a thermocline, the collision of a buoyant thermal with a temperature inversion, and the interaction of a vortex flow with a flame front. This problem also serves as a generic model for turbulent mixing and entrainment processes across sharp density interfaces. The interaction between vortices and a free surface, with corresponds to the case where the density jump is very large, has been studied fairly extensively, both experimentally and computationally. By comparison, the literature for the more general case of vortex pairs and rings interacting with sharp density interfaces is relatively sparse. Experiments and numerical studies have been performed, but the numerical simulations were confined primarily to vortex pairs, restricted to the inviscid case, and the effect of density variation modeled under the Boussinesq approximation. The experiments were also confined to the Boussinesq regime. In this paper, we study the motion of a vortex ring in a sharply stratified, viscous fluid via a numerical solution of the full Navier-Stokes equations with finite-amplitude density variation. both Boussinesq and non-Boussinesq flow regimes will be studied, the effect of viscosity on the interaction will be examined, and three-dimensional aspects of the motion will be addressed, such as Widnall instability of the vortex ring and vortex reconnection at the interface.
Simulation Of The Initial 3 D Instability Of A Vortex Ring
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Author : Justin Wiwchar
language : en
Publisher:
Release Date : 2010
Simulation Of The Initial 3 D Instability Of A Vortex Ring written by Justin Wiwchar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Computational fluid dynamics categories.
Numerical Simulation Of Evolution Of A Vortex Ring And Its Interaction With A Rigid Sphere
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Author : Ki-Wahn Ryu
language : en
Publisher:
Release Date : 1996
Numerical Simulation Of Evolution Of A Vortex Ring And Its Interaction With A Rigid Sphere written by Ki-Wahn Ryu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Numerical Simulation Of A Viscous Vortex Ring Interaction With A Density Interface
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Author : Daniel L. Marcus
language : en
Publisher:
Release Date : 1991
Numerical Simulation Of A Viscous Vortex Ring Interaction With A Density Interface written by Daniel L. Marcus and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Vortex Rings And Jets
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Author : Daniel T. H. New
language : en
Publisher: Springer
Release Date : 2015-03-26
Vortex Rings And Jets written by Daniel T. H. New and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-26 with Technology & Engineering categories.
In this book, recent developments in our understanding of fundamental vortex ring and jet dynamics will be discussed, with a view to shed light upon their near-field behaviour which underpins much of their far-field characteristics. The chapters provide up-to-date research findings by their respective experts and seek to link near-field flow physics of vortex ring and jet flows with end-applications in mind. Over the past decade, our knowledge on vortex ring and jet flows has grown by leaps and bounds, thanks to increasing use of high-fidelity, high-accuracy experimental techniques and numerical simulations. As such, we now have a much better appreciation and understanding on the initiation and near-field developments of vortex ring and jet flows under many varied initial and boundary conditions. Chapter 1 outlines the vortex ring pinch-off phenomenon and how it relates to the initial stages of jet formations and subsequent jet behaviour, while Chapter 2 takes a closer look at the behaviour resulting from vortex ring impingement upon solid boundaries and how the use of a porous surface alters the impingement process. Chapters 3 and 4 focus upon the formation of synthetic jets from vortex ring structures experimentally and numerically, the challenges in understanding the relationships between their generation parameters and how they can be utilized in flow separation control problems. Chapter 5 looks at the use of imposing selected nozzle trailing-edge modifications to effect changes upon the near-field dynamics associated with circular, noncircular and coaxial jets, with a view to control their mixing behaviour. And last but not least, Chapter 6 details the use of unique impinging jet configurations and how they may lend themselves towards greater understanding and operating efficacies in heat transfer problems. This book will be useful to postgraduate students and researchers alike who wish to get up to speed regarding the latest developments in vortex ring and jet flow behaviour and how their interesting flow dynamics may be put into good use in their intended applications.
Adaptive Panel Method For Particle Simulation Of 3d Vortex Rings
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Author : Leon Kaganovskiy
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2016-01-11
Adaptive Panel Method For Particle Simulation Of 3d Vortex Rings written by Leon Kaganovskiy and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-11 with categories.
We present a new local, adaptive, higher order, tree-based quadrature and point insertion method to describe 3-D vortex sheet motion. The main new contribution is a hierarchical tree representation of the vortex sheet surface, which allows us to insert new computational particles locally as leaves of the tree as opposed to the insertion of a complete new filament as in the previous approach. We have also developed 4th order accurate integration, point insertion, and derivative calculation schemes, compared to the 2nd order schemes available before. It appears that at the later stages of computation when the mesh becomes less smooth, the lower order methods perform better. In addition, we have developed a new curvature-based point insertion scheme. The method has been applied to the motion of vortex rings which are modeled as rolled-up vortex sheets. It has allowed us for the first time to resolve the long time details of the Widnall instability of a single vortex ring and collision of two rings, including the development of complicated nonlinear regions with hairpins and many layers of roll-up.
Vortex Simulation Of The Pressure Field Of A Jet
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Author :
language : en
Publisher:
Release Date : 1976
Vortex Simulation Of The Pressure Field Of A Jet written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
A Numerical Study Of Some Vortex Ring Phenomena Using Direct Numerical Simulation Dns
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Author : Shankar Kumar Balakrishnan
language : en
Publisher:
Release Date : 2013
A Numerical Study Of Some Vortex Ring Phenomena Using Direct Numerical Simulation Dns written by Shankar Kumar Balakrishnan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.