Turbulent Convection In Rayleigh Benard Cells With Modified Boundary Conditions

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Turbulent Convection in Rayleigh-Bénard Cells with Modified Boundary Conditions

Author : Andrés Alonso Castillo-Castellanos
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Turbulent Convection in Rayleigh-Bénard Cells with Modified Boundary Conditions by : Andrés Alonso Castillo-Castellanos

Download or read book Turbulent Convection in Rayleigh-Bénard Cells with Modified Boundary Conditions written by Andrés Alonso Castillo-Castellanos and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One outstanding feature of the Rayleigh-Bénard problem which concerns a horizontal fluid layer heated from below and cooled from above, is the spontaneous establishment of spatial ordering and the formation of a coherent large-scale circulation. How different factors, such as the domain geometry and boundary conditions, influence the sizes and shapes of the large-scale flow remains an open question. Despite its apparent simplicity, Rayleigh-Bénard convection exhibits some incredibly rich and complex large-scale dynamics such as torsional modes, rotation, sloshing, and cessations, which often coexist and compete to each other. One approach, commonly used in the study of cessations is to constrain the large scale circulation to a plane by restricting the fluid domain to a (2-D) square cell or to a slim rectangular cell of small aspect ratio in the transversal direction. However, it is not entirely clear whether the 2-D and (quasi-)2-D reversals correspond to the same phenomenon. The present document is dedicated to the study of the large-scale flow patterns in turbulent Rayleigh-Bénard convection, and of the influence exerted by different factors on the flow structures and on their temporal evolution. The proposed characterization combines a statistical analysis with a physical approach relying on the angular momentum as well as the kinetic and potential energies to highlight the underlying physical mechanisms. We subsequently attempt to tie these mechanisms together to each of the distinctive flow patterns observed and to their evolution.

Rayleigh-benard Convection: Structures And Dynamics

Author : Alexander V Getling
Publisher : World Scientific
ISBN 13 : 9814498971
Total Pages : 256 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Rayleigh-benard Convection: Structures And Dynamics by : Alexander V Getling

Download or read book Rayleigh-benard Convection: Structures And Dynamics written by Alexander V Getling and published by World Scientific. This book was released on 1998-03-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable book presents a concise but systematic account of the formation of spatial flow structures in a horizontal fluid layer heated from below. Flows of this type, known as Rayleigh-Bénard convection, show important features of behaviour inherent not only in various hydrodynamic-instability phenomena but also in nonlinear pattern-forming processes in other contexts. The book describes the basic methods of investigating convection patterns, and the types of two- and three-dimensional flows, pattern defects, and sequences of convection-regime changes.The author pays special attention to the question of how various factors (mainly reducible to initial and boundary conditions) determine the shapes and sizes of the structures which develop. In this way, the role of order and disorder in flow patterns, as a factor strongly affecting the character of the evolution of structures, is revealed. The presentation emphasizes the physical picture of these phenomena, without excessive mathematical detail.

Numerical Modeling of Turbulent Convection in Rough Rayleigh-Bénard Cell

Author : Mebarek Belkadi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Numerical Modeling of Turbulent Convection in Rough Rayleigh-Bénard Cell by : Mebarek Belkadi

Download or read book Numerical Modeling of Turbulent Convection in Rough Rayleigh-Bénard Cell written by Mebarek Belkadi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent convective flows over rough boundaries are ubiquitous in geophysical and engineering applications. Understanding the mechanisms of these interactions is substantial for improving the heat transfer efficiency. In this work we study the effects of wall roughness on the Rayleigh Bénard turbulence. Three dimensional direct numerical simulations (DNS) are performed using a parallel CFD code under the support of national high performance computers. The roughness elements are embedded over hotted surface using an immersed boundary method. The numerical configuration allow the identification of three successive regimes from a thermally resistant to highly enhanced heat transfer. Through a geometrical decomposition of the rough plate into plot and surrounding fluid, we examine their different behaviors, mainly the contribution to the heat transfer. We analyze the effects of roughness on thermal and viscous boundary layers structures and on the flow physics near the wall. Besides that, the comparison with experimental data at the roughness scale highlight the non homogeneity of thermal fluctuations around the obstacles. We also focused on the effects of roughness on the flow dynamics and on the properties of thermal plumes.

Turbulent Rayleigh-Benard Convection with Freely Moving Boundary

Author : Jin-Qiang Zhong
Publisher :
ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Turbulent Rayleigh-Benard Convection with Freely Moving Boundary by : Jin-Qiang Zhong

Download or read book Turbulent Rayleigh-Benard Convection with Freely Moving Boundary written by Jin-Qiang Zhong and published by . This book was released on 2006 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Statistical Physics: Proceedings Of The 2th Tohwa Univ International Meeting

Author : Michio Tokuyama
Publisher : World Scientific
ISBN 13 : 9814545198
Total Pages : 266 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Statistical Physics: Proceedings Of The 2th Tohwa Univ International Meeting by : Michio Tokuyama

Download or read book Statistical Physics: Proceedings Of The 2th Tohwa Univ International Meeting written by Michio Tokuyama and published by World Scientific. This book was released on 1998-04-04 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical physics is one of the fundamental branches of modern science. It provides a useful tool constructing a bridge from the microscopic to the macroscopic world. In the last forty years, most of the extensive applications have been made successfully in a variety of fields, such as physics, chemistry, biology, materials science, and even astronomy, where many new concepts and methods have been developed.The purpose of this meeting is to provide an opportunity for young researchers in experimental, theoretical and computational fields to communicate with one another using the common language of statistical physics, and thus foster many-body interactions among themselves.

Rayleigh-Bénard Convection with Free-slip Boundary Conditions

Author : Matthias Rübo
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Rayleigh-Bénard Convection with Free-slip Boundary Conditions by : Matthias Rübo

Download or read book Rayleigh-Bénard Convection with Free-slip Boundary Conditions written by Matthias Rübo and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Boundary Layer Structure in Turbulent Rayleigh-Bénard Convection

Author : Nan Shi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Boundary Layer Structure in Turbulent Rayleigh-Bénard Convection by : Nan Shi

Download or read book Boundary Layer Structure in Turbulent Rayleigh-Bénard Convection written by Nan Shi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Internally Heated Convection and Rayleigh-Bénard Convection

Author : David Goluskin
Publisher : Springer
ISBN 13 : 3319239414
Total Pages : 73 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Internally Heated Convection and Rayleigh-Bénard Convection by : David Goluskin

Download or read book Internally Heated Convection and Rayleigh-Bénard Convection written by David Goluskin and published by Springer. This book was released on 2015-11-21 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief describes six basic models of buoyancy-driven convection in a fluid layer: three configurations of internally heated convection and three configurations of Rayleigh-Bénard convection. The author discusses the main quantities that characterize heat transport in each model, along with the constraints on these quantities. This presentation is the first to place the various models in a unified framework, and similarities and differences between the cases are highlighted. Necessary and sufficient conditions for convective motion are given. For the internally heated cases only, parameter-dependent lower bounds on the mean fluid temperature are proven, and results of past simulations and laboratory experiments are summarized and reanalyzed. The author poses several open questions for future study.

The Role of Thermal Boundary Conditions in Rotating Rayleigh-Bénard Convection

Author : Janet Forrester Peifer
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis The Role of Thermal Boundary Conditions in Rotating Rayleigh-Bénard Convection by : Janet Forrester Peifer

Download or read book The Role of Thermal Boundary Conditions in Rotating Rayleigh-Bénard Convection written by Janet Forrester Peifer and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Boundary Layer Heat Transport in Turbulent Rayleigh‐Bénard Convection in Air

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Boundary Layer Heat Transport in Turbulent Rayleigh‐Bénard Convection in Air by :

Download or read book Boundary Layer Heat Transport in Turbulent Rayleigh‐Bénard Convection in Air written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fluctuations in Turbulent Rayleigh-Bénard Convection

Author : Yin Wang
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Fluctuations in Turbulent Rayleigh-Bénard Convection by : Yin Wang

Download or read book Fluctuations in Turbulent Rayleigh-Bénard Convection written by Yin Wang and published by . This book was released on 2017 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structures, Boundary Layers and Plumes in Turbulent Rayleigh-Bénard Convection

Author :
Publisher :
ISBN 13 : 9789036539104
Total Pages : 187 pages
Book Rating : 4.5/5 (391 download)

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Book Synopsis Structures, Boundary Layers and Plumes in Turbulent Rayleigh-Bénard Convection by :

Download or read book Structures, Boundary Layers and Plumes in Turbulent Rayleigh-Bénard Convection written by and published by . This book was released on 2015 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Direct Numerical Simulations of Turbulent Rayleigh-Bénard Convection

Author : Wei Xu
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Direct Numerical Simulations of Turbulent Rayleigh-Bénard Convection by : Wei Xu

Download or read book Direct Numerical Simulations of Turbulent Rayleigh-Bénard Convection written by Wei Xu and published by . This book was released on 2020 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Cloud Dynamics

Author : Robert A. Houze Jr.
Publisher : Elsevier
ISBN 13 : 0080502105
Total Pages : 605 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Cloud Dynamics by : Robert A. Houze Jr.

Download or read book Cloud Dynamics written by Robert A. Houze Jr. and published by Elsevier. This book was released on 1994-06-28 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clouds play a critical role in the Earth's climate, general atmospheric circulation, and global water balance. Clouds are essential elements in mesoscale meteorology, atmospheric chemistry, air pollution, atmosphericradiation, and weather forecasting, and thus must be understood by any student or researcher in the atmospheric sciences. Cloud Dynamics provides a skillful and comprehensive examination of the nature of clouds--what they look like and why, how scientists observe them, and the basic dynamics and physics that underlie them. The book describes the mechanics governing each type of cloud that occurs in Earth's atmosphere, and the organization of various types of clouds in larger weather systems such as fronts, thunderstorms, and hurricanes.This book is aimed specifically at graduate students, advanced undergraduates, practicing researchers either already in atmospheric science or moving in from a related scientific field, and operational meteorologists. Some prior knowledge of atmospheric dynamics and physics is helpful, but a thorough overview of the necessary prerequisites is supplied. Provides a complete treatment of clouds integrating the analysis of air motions with cloud structure, microphysics, and precipitation mechanics Describes and explains the basic types of clouds and cloud systems that occur in the atmosphere-fog, stratus, stratocumulus, altocumulus, altostratus, cirrus, thunderstorms, tornadoes, waterspouts, orographically induced clouds, mesoscale convection complexes, hurricanes, fronts, and extratropical cyclones Presents a photographic guide, presented in the first chapter, linking the examination of each type of cloud with an image to enhance visual retention and understanding Summarizes the fundamentals, both observational and theoretical, of atmospheric dynamics, thermodynamics, cloud microphysics, and radar meteorology, allowing each type of cloud to be examined in depth Integrates the latest field observations, numerical model simulations, and theory Supplies a theoretical treatment suitable for the advanced undergraduate or graduate level

Dynamics of Spatio-Temporal Cellular Structures

Author : Innocent Mutabazi
Publisher : Springer
ISBN 13 : 0387251111
Total Pages : 249 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis Dynamics of Spatio-Temporal Cellular Structures by : Innocent Mutabazi

Download or read book Dynamics of Spatio-Temporal Cellular Structures written by Innocent Mutabazi and published by Springer. This book was released on 2010-06-14 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.

Magnetoconvection

Author : N. O. Weiss
Publisher : Cambridge University Press
ISBN 13 : 052119055X
Total Pages : 411 pages
Book Rating : 4.5/5 (211 download)

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Book Synopsis Magnetoconvection by : N. O. Weiss

Download or read book Magnetoconvection written by N. O. Weiss and published by Cambridge University Press. This book was released on 2014-10-30 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading experts present the current state of knowledge of the subject of magnetoconvection from the viewpoint of applied mathematics.

Experimental investigation and computational modelling of thermal boundary layers in turbulent natural convection

Author : Claudia Zimmermann
Publisher : Cuvillier Verlag
ISBN 13 : 3736980612
Total Pages : 358 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Experimental investigation and computational modelling of thermal boundary layers in turbulent natural convection by : Claudia Zimmermann

Download or read book Experimental investigation and computational modelling of thermal boundary layers in turbulent natural convection written by Claudia Zimmermann and published by Cuvillier Verlag. This book was released on 2015-09-08 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die vorliegende Arbeit beschäftigt sich mit der numerischen und experimentellen Modellierung turbulenter thermisch angetriebener Luftströmungen in unterschiedlichen Test-Konfigurationen. Diese so genannten Konvektionsströmungen stellen eines der fundamentalen Probleme der Strömungsmechanik dar. Sie ziehen ein großes wissenschaftliches Interesse auf sich, da sie in vielen Bereichen, wie z. B. in der Meteorologie oder auch in industriellen Anwendungen, eine wesentliche Rolle spielen. Vor allem vor dem Hintergrund atmosphärischer Konvektionsströmungen, die durch eine durch die Erdbewegung hervorgerufene Corioliskraft beeinflusst werden und sich zu Wirbelstürmen ausbilden können, ist ein Verständnis dieser Strömungen sehr wichtig. Die Konvektionsströmung wird in jeder einzelnen Test-Konfiguration immer zwischen zwei sich gegenüberliegenden, isotherm beheizten Wänden erzeugt. Neben der Validierung des gewählten numerischen Modells einer Large-Eddy-Simulation (LES), geben die erzielten Ergebnisse der Arbeit Aufschluss über die Strömungsdynamik, die entstehenden Turbulenzstrukturen sowie die Wärmeübertragung in der jeweiligen Test-Konfiguration. Hierbei steht vor allem die Auflösung der thermalen Wandgrenzschicht im Mittelpunkt. Hervorzuheben ist die numerische sowie auch experimentelle Untersuchung eines sogenannten Rayleigh-Bénard Problems, das unter Einfluss einer zusätzlich wirkenden Corioliskraft steht. Das hierfür realisierte Experiment in einer Großzentrifuge und die zugehörige numerische Studie geben Aufschluss über die Auswirkung der zusätzlich wirkenden Relativbeschleunigungen auf die Turbulenzproduktion und die Wärmeübertragung im Fluid.