Download or read book Numerical Modelling of Compositional and Particle driven Turbulent Gravity Currents written by Hafiz Junaid Anjum and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gravity Currents And Intrusions Analysis And Prediction written by Marius Ungarish and published by World Scientific. This book was released on 2020-12-08 with total page 815 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow of gravity currents and intrusions is a subject of active research and engineering application. Currently, there are no formal teaching courses for this topic. Materials and information available in the market are scattered and dated. Researchers and engineers face difficulties in acquiring the 'state-of-the-art' knowledge. The book bridges this gap between the need and supply of the relevant insight and know-how.Written by a renowned author who is a recognized authority in the field, this unique compendium assembles the relevant knowledge into a systematic and unified framework. The presentation is gradual from the elementary to the frontier, and accessible to readers with only a basic background in fluid mechanics and applied mathematics. This will facilitate the systematic acquirement and application of available knowledge to both practical problems and further research.This must-have volume is a useful monograph — that can also serve as a textbook in advanced courses — for researchers, students, engineers and applied mathematicians in the fields of civil engineering, hydraulic engineering, mechanical engineering, ocean engineering and environmental engineering.
Download or read book Particulate Gravity Currents written by W. D. McCaffrey and published by John Wiley & Sons. This book was released on 2009-03-05 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume arises from the conference Sediment Transport andDeposition by Particulate Gravity Currents held in the UK in 1998.The field of particulate gravity currents ranges from turbiditycurrents in the oceans, lakes and reservoirs to pyroclastic densitycurrents and avalanches, debris flows and lahars, grainflows,powder snow avalanches, effluent dispersal and ancient gravitycurrent deposits. Although the sub-division of particulate gravity currents intodiscrete sub-categories (such as grain flows, turbidity currents ordebris flows) provides a convenient descriptive shorthand, itundermines the sense of process continuum needed to describe manynatural flows. The structure of this volume reflects an integrativeaim, with papers grouped by research approach. The first section ofthe book contains six papers on theoretical and numerical modellingof a range of flow types. The following four papers are focusedupon combined theoretical and experimental modelling approaches.The next section contains four papers describing experimentalmodelling and the final section includes five papers detailingfield-based studies. The volume stands as a testament to the broad range of researchcarried out on particulate gravity currents, and hints at theenhanced rate of progress that is likely to be achieved throughfurther integrated studies. If you are a member of the International Association ofSedimentologists, for purchasing details, please see:http://www.iasnet.org/publications/details.asp?code=SP31
Download or read book Numerical Investigation Into the Turbulence of an Unsteady Gravity Current written by Joë Dany Steve Pelmard and published by . This book was released on 2020 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsteady gravity currents are flow processes developing after the intrusion of a fluid into a quiescent environment of lower density. The intense and complex turbulence dynamics developing at the interface between the two fluids contribute to a large range of interactions between the current and its surroundings; including entrainment and transport of large masses of fluid such as stagnant pollutants in coastal and urban areas, or damage to subaqueous infrastructure on its path due to the strain applied by both the current’s passage and the subsequent local turbulent strain. The study focuses on a two-dimensionally propagating gravity current over a mild slope. The local flow turbulence in the mixing layer of an unsteady channel gravity current is numerically investigated. The flow was modelled as a Boussinesq buoyant-driven flow using the inhouse Navier-Stokes solver SnS and a standard Smagorinsky large eddy simulation (LES) model. LES allows the investigation of fully turbulent flows that cannot otherwise be simulated due to computer limitations. The model is shown to predict well the bulk structure of the current as well as the local flow instabilities responsible for the growth of turbulence in the mixing layer, and recommendations are given for the choice of the grid resolution for a well-resolved- LES of gravity currents. Turbulence was statistically investigated by computing the averaged flow and turbulence statistics by ensemble- and spanwise-averaging 200 simulation results at two time instants, characteristic of two main propagation phases of the current, namely the slumping phase and the inertial phase. It is shown that the characteristic structure of a dense frontal head followed by a body akin to a stratified shear layer can be directly correlated to the growth, decay and changes in the isotropy of turbulence along the mixing layer. The stability of the mixing layer is found to be governed by the flux Richardson number at the limit of the head whereas the gradient Richardson number describes well the fading of the Kelvin-Helmholtz instabilities and the establishment of a region of dynamical quasi-stationarity in the body. In contrast with planar stratified shear layers where buoyancy is strictly dissipative, the motion is here shown to be partly supplied by buoyancy produced turbulence through energy backscatter at the front. This process is expected to extend farther inside the body with increasing bed slopes, and the mixing layer to develop substantially different turbulence and mixing dynamics than the ones implied here at sufficiently high bed slopes.
Download or read book Mixing and Dispersion in Flows Dominated by Rotation and Buoyancy written by Herman J.H. Clercx and published by Springer. This book was released on 2017-10-24 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a state-of-the-art overview of current developments in the field in a way accessible to attendees coming from a variety of fields. Relevant examples are turbulence research, (environmental) fluid mechanics, lake hydrodynamics and atmospheric physics. Topics discussed range from the fundamentals of rotating and stratified flows, mixing and transport in stratified or rotating turbulence, transport in the atmospheric boundary layer, the dynamics of gravity and turbidity currents eventually with effects of background rotation or stratification, mixing in (stratified) lakes, and the Lagrangian approach in the analysis of transport processes in geophysical and environmental flows. The topics are discussed from fundamental, experimental and numerical points of view. Some contributions cover fundamental aspects including a number of the basic dynamical properties of rotating and or stratified (turbulent) flows, the mathematical description of these flows, some applications in the natural environment, and the Lagrangian statistical analysis of turbulent transport processes and turbulent transport of material particles (including, for example, inertial and finite-size effects). Four papers are dedicated to specific topics such as transport in (stratified) lakes, transport and mixing in the atmospheric boundary layer, mixing in stratified fluids and dynamics of turbidity currents. The book is addressed to doctoral students and postdoctoral researchers, but also to academic and industrial researchers and practicing engineers, with a background in mechanical engineering, applied physics, civil engineering, applied mathematics, meteorology, physical oceanography or physical limnology.
Download or read book Buoyancy Driven Flows written by Eric P. Chassignet and published by Cambridge University Press. This book was released on 2012-03-05 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes buoyancy-driven flows for advanced students and researchers in oceanography, geophysical fluid dynamics, atmospheric science and Earth science.
Download or read book Gravity Currents written by John E. Simpson and published by . This book was released on 1987 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: This explanation of the nature of gravity currents (Bouyancy-driven flows in fluids) and their manifestations in the atmosphere, the oceans and the earth sciences, fills a serious gap in the literature. It will also benefit a great many workers in other scientific disciplines, who will be able to apply the principles of gravity currents to their own specialist subject. Much of the work has not previously been published, and the publishers know of no other book with a similar range of information. The author's own work in the development of a variety of laboratory experiments designed to offer an understanding of the physical processes, is made very clear to the reader, illustrating a range of phenomena which are important in areas as diverse as aircraft safety, the distribution of airborne pests, and airborne pollution. The study of oceans ranges from the Gulf Stream to river fronts in lakes and fjords, where the formation of a front is of biological importance. In a section on avalanche flows, avalanches of snow, rock, and volcanic eruptions, are also shown to be gravity currents of vital significance. Factors influencing the behaviour of gravity currents are reviewed. The topics are dealt with in numerous laboratory experiments, and only simple mathematics is included. A final chapter reviews the growing subject of numerical models of gravity currents.
Download or read book Modeling Approaches and Computational Methods for Particle laden Turbulent Flows written by Shankar Subramaniam and published by Academic Press. This book was released on 2022-10-20 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling Approaches and Computational Methods for Particle-laden Turbulent Flows introduces the principal phenomena observed in applications where turbulence in particle-laden flow is encountered while also analyzing the main methods for analyzing numerically. The book takes a practical approach, providing advice on how to select and apply the correct model or tool by drawing on the latest research. Sections provide scales of particle-laden turbulence and the principal analytical frameworks and computational approaches used to simulate particles in turbulent flow. Each chapter opens with a section on fundamental concepts and theory before describing the applications of the modelling approach or numerical method. Featuring explanations of key concepts, definitions, and fundamental physics and equations, as well as recent research advances and detailed simulation methods, this book is the ideal starting point for students new to this subject, as well as an essential reference for experienced researchers. Provides a comprehensive introduction to the phenomena of particle laden turbulent flow Explains a wide range of numerical methods, including Eulerian-Eulerian, Eulerian-Lagrange, and volume-filtered computation Describes a wide range of innovative applications of these models
Download or read book Experiments and Numerical Simulation of Three dimensional Turbulence in Gravity Currents written by Caroline Rosemary Marshall and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt: obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.
Download or read book Special Publication of the International Association of Sedimentologists written by and published by . This book was released on 2001 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulations of Particle driven Gravity Currents Using Eulerian and Lagrangian Description written by Oliver Häuselman and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particles in Turbulent Flows written by Leonid I. Zaichik and published by John Wiley & Sons. This book was released on 2008-12-04 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work available to treat the theory of turbulent flow with suspended particles, this book also includes a section on simulation methods, comparing the model results obtained with the PDF method to those obtained with other techniques, such as DNS, LES and RANS. Written by experienced scientists with background in oil and gas processing, this book is applicable to a wide range of industries -- from the petrol industry and industrial chemistry to food and water processing.
Download or read book Mathematical and Numerical Foundations of Turbulence Models and Applications written by Tomás Chacón Rebollo and published by Birkhäuser. This book was released on 2016-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With applications to climate, technology, and industry, the modeling and numerical simulation of turbulent flows are rich with history and modern relevance. The complexity of the problems that arise in the study of turbulence requires tools from various scientific disciplines, including mathematics, physics, engineering and computer science. Authored by two experts in the area with a long history of collaboration, this monograph provides a current, detailed look at several turbulence models from both the theoretical and numerical perspectives. The k-epsilon, large-eddy simulation and other models are rigorously derived and their performance is analyzed using benchmark simulations for real-world turbulent flows. Mathematical and Numerical Foundations of Turbulence Models and Applications is an ideal reference for students in applied mathematics and engineering, as well as researchers in mathematical and numerical fluid dynamics. It is also a valuable resource for advanced graduate students in fluid dynamics, engineers, physical oceanographers, meteorologists and climatologists.
Download or read book Homogeneous and Particle driven Gravity Currents written by James Russell Hoyes and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulence in Fluids written by Marcel Lesieur and published by Springer. This book was released on 2012-07-28 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analogue and Numerical Modelling of Gravity Currents and Pyroclastic Flows written by and published by . This book was released on 2007 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
