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Author : Carlos J. Jiménez-Härtel
Publisher :
Page : 84 pages
File Size : 47,83 MB
Release : 1999
Category : Suspensionsströmung - Direkte numerische Simulation
ISBN : 9783183366071
Author : Jared Penney
Publisher :
Page : 140 pages
File Size : 22,36 MB
Release : 2017
Category :
ISBN :
Double-diffusion refers to a class of instabilities that develops when the density of a fluid depends on two components with different diffusivities. For example, when warm, salty water is layered over cool, fresh water, there is relatively rapid diffusive transfer of heat from the upper layer to the lower layer, while there is negligible diffusive transfer of salt. This loss of heat results in localized parcels of fluid of increased density above the thermohaline interface, which sink out in the form of long, thin, convective cells called salt fingers. In parts of the ocean, salt fingers are known to be an important mechanism of heat and salt transport. However, they range from a few millimetres to centimetres wide, and are much smaller in scale than many oceanographic processes. The fine scale of these structures can also make their direct measurement in the environment using typical devices difficult. This thesis employs high-resolution direct numerical simulation for detailed examination of fine-scale double-diffusive features. An advantage of numerical simulation is the straightforward computation of quantities that cannot be measured directly through experiment, such as dissipation, stirring, and mixing. Two distinct types of flow are investigated. First, simulations of salt fingering gravity currents are examined, and the effect of different vertical boundary conditions and current volumes are analyzed. Second, a three-layer system resulting in double-diffusive Rayleigh-Taylor (RT) instabilities that transitions to double-diffusive turbulence in the absence of shear is presented. The flows are governed by the incompressible Navier-Stokes equations under the Boussinesq approximation, with salinity and temperature coupled to the equations of motion using a nonlinear approximation to the UNESCO equation of state. Flow dynamics are characterized using high-quality three-dimensional visualization techniques. In the gravity current simulations, it was observed that no-slip boundaries cause the current head to take the standard lobe-and-cleft shape, and encourage both a greater degree and an earlier onset of three-dimensionalization when compared to free-slip boundary cases. Additionally, numerical simulations with no-slip boundary conditions experience greater viscous dissipation, stirring, and mixing when compared to similar configurations using free-slip conditions. The Rayleigh-Taylor instabilities were observed to dominate the length scales of kinetic energy, while the length scales associated with the density field were dominated by double-diffusion. This was confirmed through spectral analysis, which also showed similarity between the dominant salinity and density scales. The standard eddy viscosity formulation was determined to be inappropriate for the salinity and temperature fluxes of this simulation. Due to the effects of double-diffusion, densities greater than the initial maximum value were observed in the RT instability simulations.
Author : Marius Ungarish
Publisher : World Scientific
Page : 815 pages
File Size : 21,61 MB
Release : 2020-12-08
Category : Technology & Engineering
ISBN : 9811225966
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.
Author : Michele Mossa
Publisher : MDPI
Page : 286 pages
File Size : 47,96 MB
Release : 2019-03-08
Category : Technology & Engineering
ISBN : 303897594X
Understanding of the role of turbulence in controlling transport processes is of paramount importance for the preservation and protection of aquatic ecosystems, the minimization of the deleterious consequences of anthropogenic activity, and the successful sustainable development of river and maritime areas. In this context, the present Special Issue collects 15 papers which provide a representation of the present understanding of turbulent processes and their effects in river and maritime environments. The presented collection of papers is not exhaustive, but it highlights the key priority areas and knowledge gaps in this field of research. The published papers present the state-of-the-art knowledge of complex environmental flows which are useful for researchers and practitioners. The paper contents are an overview of some recent topics of research and an exposure of the current and future challenges associated with these topics.
Author : Lutz Angermann
Publisher : BoD – Books on Demand
Page : 454 pages
File Size : 39,6 MB
Release : 2010-12-30
Category : Computers
ISBN : 9533071532
This book will interest researchers, scientists, engineers and graduate students in many disciplines, who make use of mathematical modeling and computer simulation. Although it represents only a small sample of the research activity on numerical simulations, the book will certainly serve as a valuable tool for researchers interested in getting involved in this multidisciplinary field. It will be useful to encourage further experimental and theoretical researches in the above mentioned areas of numerical simulation.
Author : George Constantinescu
Publisher : CRC Press
Page : 2434 pages
File Size : 16,22 MB
Release : 2016-06-22
Category : Technology & Engineering
ISBN : 1315644479
Understanding and being able to predict fluvial processes is one of the biggest challenges for hydraulics and environmental engineers, hydrologists and other scientists interested in preserving and restoring the diverse functions of rivers. The interactions among flow, turbulence, vegetation, macroinvertebrates and other organisms, as well as the transport and retention of particulate matter, have important consequences on the ecological health of rivers. Managing rivers in an ecologically friendly way is a major component of sustainable engineering design, maintenance and restoration of ecological habitats. To address these challenges, a major focus of River Flow 2016 was to highlight the latest advances in experimental, computational and theoretical approaches that can be used to deepen our understanding and capacity to predict flow and the associated fluid-driven ecological processes, anthropogenic influences, sediment transport and morphodynamic processes. River Flow 2016 was organized under the auspices of the Committee for Fluvial Hydraulics of the International Association for Hydro-Environment Engineering and Research (IAHR). Since its first edition in 2002, the River Flow conference series has become the main international event focusing on river hydrodynamics, sediment transport, river engineering and restoration. Some of the highlights of the 8th International Conference on Fluvial Hydraulics were to focus on inter-disciplinary research involving, among others, ecological and biological aspects relevant to river flows and processes and to emphasize broader themes dealing with river sustainability. River Flow 2016 (extended abstract book 854 pages + full paper CD-ROM 2436 pages) contains the contributions presented during the regular sessions covering the main conference themes and the special sessions focusing on specific hot topics of river flow research, and will be of interest to academics interested in hydraulics, hydrology and environmental engineering.
Author : Henry França Meier
Publisher : Springer Nature
Page : 213 pages
File Size : 44,71 MB
Release : 2023-05-10
Category : Technology & Engineering
ISBN : 3031259904
This book presents selected papers from the 12th edition of the Spring School of Transition and Turbulence which took place in 2020. The papers cover applications on a number of industrial processes, such as the automotive, aeronautics, chemicals, oil and gas, food, nanotechnology, and others. The readers find out research and applied works on the topics of aerodynamics, computational fluid dynamics, instrumentation and experiments, multi-phase flows, and theoretical and analytical modeling.
Author : David E. Reisner
Publisher : CRC Press
Page : 1370 pages
File Size : 22,66 MB
Release : 2014-09-24
Category : Science
ISBN : 0415621291
The world’s fresh water supplies are dwindling rapidly—even wastewater is now considered an asset. By 2025, most of the world's population will be facing serious water stresses and shortages. Aquananotechnology: Global Prospects breaks new ground with its informative and innovative introduction of the application of nanotechnology to the remediation of contaminated water for drinking and industrial use. It provides a comprehensive overview, from a global perspective, of the latest research and developments in the use of nanotechnology for water purification and desalination methods. The book also covers approaches to remediation such as high surface area nanoscale media for adsorption of toxic species, UV treatment of pathogens, and regeneration of saturated media with applications in municipal water supplies, produced water from fracking, ballast water, and more. It also discusses membranes, desalination, sensing, engineered polymers, magnetic nanomaterials, electrospun nanofibers, photocatalysis, endocrine disruptors, and Al13 clusters. It explores physics-based phenomena such as subcritical water and cavitation-induced sonoluminescence, and fog harvesting. With contributions from experts in developed and developing countries, including those with severe contamination, such as China, India, and Pakistan, the book’s content spans a wide range of the subject areas that fall under the aquananotechnology banner, either squarely or tangentially. The book strongly emphasizes sorption media, with broad application to a myriad of contaminants—both geogenic and anthropogenic—keeping in mind that it is not enough for water to be potable, it must also be palatable.
Author : Peep Miidla
Publisher : BoD – Books on Demand
Page : 422 pages
File Size : 14,99 MB
Release : 2012-03-23
Category : Computers
ISBN : 9535102192
This book demonstrates applications and case studies performed by experts for professionals and students in the field of technology, engineering, materials, decision making management and other industries in which mathematical modelling plays a role. Each chapter discusses an example and these are ranging from well-known standards to novelty applications. Models are developed and analysed in details, authors carefully consider the procedure for constructing a mathematical replacement of phenomenon under consideration. For most of the cases this leads to the partial differential equations, for the solution of which numerical methods are necessary to use. The term Model is mainly understood as an ensemble of equations which describe the variables and interrelations of a physical system or process. Developments in computer technology and related software have provided numerous tools of increasing power for specialists in mathematical modelling. One finds a variety of these used to obtain the numerical results of the book.
Author : John E. Simpson
Publisher : Cambridge University Press
Page : 262 pages
File Size : 31,71 MB
Release : 1999-10-21
Category : Science
ISBN : 9780521664011
A 1997 paperback of well-received study of gravity currents for many disciplines, including meteorology, oceanography, earth science.