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Author: Gerrit Green Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis is dedicated to the study of turbulent superstructures in Rayleigh-Bénard convection. Turbulent superstructures are horizontally extended large-scale flow patterns that emerge despite the presence of strong fluctuations. They persist for long time scales, evolve slowly compared to the fluctuations, and their extent increases with increasing driving. This phenomenon is observed in large-aspect-ratio experiments and simulations and is very important for various geo- and astrophysical flows. There are many open questions regarding their origin and dynamics, and we study some aspect...
Author: Gerrit Green Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis is dedicated to the study of turbulent superstructures in Rayleigh-Bénard convection. Turbulent superstructures are horizontally extended large-scale flow patterns that emerge despite the presence of strong fluctuations. They persist for long time scales, evolve slowly compared to the fluctuations, and their extent increases with increasing driving. This phenomenon is observed in large-aspect-ratio experiments and simulations and is very important for various geo- and astrophysical flows. There are many open questions regarding their origin and dynamics, and we study some aspect...
Author: Mahendra Kumar Verma Publisher: World Scientific ISBN: 9813237813 Category : Science Languages : en Pages : 352
Book Description
Gravity pervades the whole universe; hence buoyancy drives fluids everywhere including those in the atmospheres and interiors of planets and stars. Prime examples of such flows are mantle convection, atmospheric flows, solar convection, dynamo process, heat exchangers, airships and hot air balloons. In this book we present fundamentals and applications of thermal convection and stratified flows.Buoyancy brings in extremely rich phenomena including waves and instabilities, patterns, chaos, and turbulence. In this book we present these topics in a systematic manner. First we present a unified treatment of linear theory that yields waves and thermal instability for stably and unstably-stratified flows respectively. We extend this analysis to include rotation and magnetic field. We also describe nonlinear saturation and pattern formation in Rayleigh-Bénard convection.The second half of the book is dedicated to buoyancy-driven turbulence, both in stably-stratified flow and in thermal convection. We describe the spectral theory including energy flux and show that the thermally-driven turbulence is similar to hydrodynamic turbulence. We also describe large-scale quantities like Reynolds and Nusselt numbers, flow anisotropy, and the dynamics of flow structures, namely flow reversals. Thus, this book presents all the major aspects of the buoyancy-driven flows in a coherent manner that would appeal to advanced graduate students and researchers.
Author: Manuel García-Villalba Publisher: Springer Nature ISBN: 3030428222 Category : Technology & Engineering Languages : en Pages : 478
Book Description
This book gathers the proceedings of the 12th instalment in the bi-annual Workshop series on Direct and Large Eddy Simulation (DLES), which began in 1994 and focuses on modern techniques used to simulate turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structure. With the rapidly expanding capacities of modern computers, this approach has attracted more and more interest over the years and will undoubtedly be further enhanced and applied in the future. Hybrid modelling techniques based on a combination of LES and RANS approaches also fall into this category and are covered as well. The goal of the Workshop was to share the state of the art in DNS, LES and related techniques for the computation and modelling of turbulent and transitional flows. The respective papers highlight the latest advances in the prediction, understanding and control of turbulent flows in academic and industrial applications.
Author: Hiroji Nakagawa Publisher: Routledge ISBN: 1351406604 Category : Technology & Engineering Languages : en Pages : 246
Book Description
A review of open channel turbulence, focusing especially on certain features stemming from the presence of the free surface and the bed of a river. Part one presents the statistical theory of turbulence; Part two addresses the coherent structures in open-channel flows and boundary layers.
Author: Gerrit Green
Author: Gerrit Green
Author: Kin Lok Ma
Author: Moshe Bukai
Author: Tomi Haramina
Author: John Joseph Carroll
Author: Dan Škandera
Author: Robert Carpenter Millard (Jr)
Author: Mahendra Kumar Verma
Author: Manuel García-Villalba
Author: Hiroji Nakagawa