Download or read book Experimental and Numerical Investigation of Zonal Jets in Geophysical Flows written by Uday Bhaskar Hari and published by . This book was released on 2020 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Zonal Jets written by Boris Galperin and published by Cambridge University Press. This book was released on 2019-02-28 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a comprehensive, multidisciplinary volume on the physics of zonal jets, from the leading experts, for graduate students and researchers.
Download or read book An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow written by 夏麗萍 and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow" by 夏麗萍, Liping, Xia, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123789 Subjects: Unsteady flow (Aerodynamics) Jets - Fluid dynamics
Download or read book An Experimental and Numerical Investigation of Three dimensional Jet Flows from Sharp edged Orifices microform written by Rainer Rudolf Schwab and published by National Library of Canada. This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow written by Liping Xia and published by . This book was released on 1998 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental and Numerical Investigation of Confined Coaxial Turbulent Jets written by Jeyhoon Mamaghani Khodadadi and published by . This book was released on 1986 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Numerical Investigation of Positively and Negatively buoyant Round Jets in a Stagnant Water Ambient written by Hassan Alfaifi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical and Experimental Investigation of Jet Induced Flow in Cylindrical Tanks written by ISSA TUWEGIAR. and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Treatise on Geophysics written by and published by Elsevier. This book was released on 2015-04-17 with total page 5604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Geophysics, Second Edition, is a comprehensive and in-depth study of the physics of the Earth beyond what any geophysics text has provided previously. Thoroughly revised and updated, it provides fundamental and state-of-the-art discussion of all aspects of geophysics. A highlight of the second edition is a new volume on Near Surface Geophysics that discusses the role of geophysics in the exploitation and conservation of natural resources and the assessment of degradation of natural systems by pollution. Additional features include new material in the Planets and Moon, Mantle Dynamics, Core Dynamics, Crustal and Lithosphere Dynamics, Evolution of the Earth, and Geodesy volumes. New material is also presented on the uses of Earth gravity measurements. This title is essential for professionals, researchers, professors, and advanced undergraduate and graduate students in the fields of Geophysics and Earth system science. Comprehensive and detailed coverage of all aspects of geophysics Fundamental and state-of-the-art discussions of all research topics Integration of topics into a coherent whole
Download or read book Zonal Flows in Planetary Fluid Layers written by Ashna Aggarwal and published by . This book was released on 2022 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zonal flows are some of the most ubiquitous and pronounced fluid structures observed in the solar system. They are found in Earth's atmospheres and oceans, likely Earth's liquid outer core, and on the surfaces of the gas giant planets and dwarf stars. They are responsible for mechanisms such as the transfer of heat and momentum in atmospheres, which can lead to complex weather systems on Earth and other planets. Though they are essential to the dynamics of geophysical and astrophysical bodies, their formation, evolution, and breakdown is not well understood. However, it is known that zonal flows in planetary and stellar fluid systems are controlled by the complex interplay of convection, rotation, and magnetic forces. For my dissertation, I have carried out two projects that contribute to our understanding of how zonal flows, and thus geophysical and astrophysical bodies, are influenced by these forces. For the first project, in collaboration with my advisor Jonathan Aurnou and professor Susanne Horn from Coventry University, I developed and used a novel computational code to model the mechanism responsible for the damping of the large-scale, azimuthally directed ``jets'' observed at Jupiter's surface which is not well understood. Electromagnetic forces are thought to play a role as the planet's electrical conductivity increases radially with depth. In order to isolate the jet damping process, we carry out a suite of direct numerical simulations of quasi-two-dimensional, horizontally periodic Rayleigh-B\'{e}nard convection (RBC) with stress-free boundary conditions in the presence of an external, vertical magnetic field. Without a magnetic field, jets, punctuated by intermittent convective bursts, develop at Rayleigh ($Ra$, ratio of buoyancy to diffusion) numbers beyond $10^5$. Five primary flow regimes are found by varying $10^3 \leq Ra \leq 10^{10}$ and the Chandrasekhar number ($Ch$, ratio of Lorentz to viscosity) $0 \leq Ch \leq 10^6$: (i) steady convection rolls, (ii) steady magneto-columns, (iii) unsteady to turbulent magneto-plumes, (iv) horizontally drifting magneto-plumes, and (v) jets with intermittent turbulent convective bursts. We parse the parameter space using transition laws derived from the interaction parameter ($N$, ratio of Lorentz to inertia). The transition to the regime dominated by jets has the most immediate applications to the magnetic damping of Jovian jet flows, where the separation between jets and a magnetically constrained system occurs at a jet-based interaction parameter value of $N_J \approx 1$. We conclude by approximating the value of the Jovian interaction parameter as a function of depth, and find that the jets may brake at approximately $6,000$ km below the surface, which is deeper than recent estimates from NASA's Juno mission. This implies that mechanisms in addition to electromagnetic forces are likely required to fully truncate the jets. For the second project, in collaboration with Jonathan Aurnou and previous UCLA student Taylor Lonner, I developed the theoretical framework for and analyzed the data from a novel experimental device, which was built and run by Taylor. Through this project, we seek to increase our understanding of how turbulent fluid motions in Earth's liquid iron core sustain the geodynamo. The underlying flow, in which zonal jets may also play a key role, is influenced by planetary rotation, buoyancy and magnetic forces, and the geometry of the spherical shell. Recent numerical studies, which aim to characterize the dominant length and velocity scales in spherical rotating convection models, are limited by the long integration times required to access laboratory-scale turbulence. Furthermore, core-style turbulent convection is difficult to simulate with spherical shell experiments due to friction from solid container boundaries, and limitations, to date, on container size. In this project, we take advantage of strong laboratory turbulence by utilizing a cylindrical laboratory device that incorporates both the effects of boundary curvature, quantified by a topographic $\beta$-effect, and a predominantly cylindrically-radial centrifugal forcing, a proxy for gravity, to model low-latitude core convection. The experiment is characterized by a paraboloidal free surface and features a cylindrically-radial temperature gradient to drive convection. This novel set-up approximates the topographic $\beta$ profiles in a sphere, thus providing a meaningful proxy for low-latitude core convection. Three cases of rotating convection at 35, 50, and 60 RPM were run, with UDV velocity profiles, novel surface thermography, and basal thermometry for diagnostics. The combination of the topographic $\beta$-effect and convectively driven turbulence leads to the formation of coherent, alternating prograde-retrograde jets in all three experiments. The analysis in this thesis shows that the width of the jets closely follows a length scale known as the Rhines scale. The Rhines scale is expected when the topographic $\beta$-effect halts the transfer of energy from small to large scales that can occur in turbulent, rapidly rotating systems. Several other interesting flow features are noted here, including topographic and thermal Rossby waves and jet migration that closely match theoretical predictions. This device, with a paraboloidal free surface and laterally driven convection, can provide length and velocity scale estimates for the turbulent dynamics in low-latitude regions of Earth's outer core, and further elucidate the processes responsible for the geomagnetic field.
Download or read book Introduction to Geophysical Fluid Dynamics written by Benoit Cushman-Roisin and published by Academic Press. This book was released on 2011-08-26 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Geophysical Fluid Dynamics provides an introductory-level exploration of geophysical fluid dynamics (GFD), the principles governing air and water flows on large terrestrial scales. Physical principles are illustrated with the aid of the simplest existing models, and the computer methods are shown in juxtaposition with the equations to which they apply. It explores contemporary topics of climate dynamics and equatorial dynamics, including the Greenhouse Effect, global warming, and the El Nino Southern Oscillation. Combines both physical and numerical aspects of geophysical fluid dynamics into a single affordable volume Explores contemporary topics such as the Greenhouse Effect, global warming and the El Nino Southern Oscillation Biographical and historical notes at the ends of chapters trace the intellectual development of the field Recipient of the 2010 Wernaers Prize, awarded each year by the National Fund for Scientific Research of Belgium (FNR-FNRS)
Download or read book Experimental and Numerical Investigations of Confluent Round Jets written by Klas Svensson and published by . This book was released on 2015 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Study of Confined Turbulent Jets written by J. Zhu and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation is reported of turbulent incompressible jets confined in two ducts, one cylindrical and the other conical with a 5 degree divergence. In each case, three Craya-Curtet numbers are considered which correspond, respectively, to flow situations with no moderate and strong recirculation. Turbulence closure is achieved by using the k-epsilon model and a recently proposed realizable Reynolds stress algebraic equation model that relates the Reynolds stresses explicitly to the quadratic terms of the mean velocity gradients and ensures the positiveness of each component of the turbulent kinetic energy. Calculations are carried out with a finite-volume procedure using boundary-fitted curvilinear coordinates. A second-order accurate, bounded convection scheme and sufficiently fine grids are used to prevent the solutions from being contaminated by numerical diffusion. The calculated results are compared extensively with the available experimental data. It is shown that the numerical methods presented are capable of capturing the essential flow features observed in the experiments and that the realizable Reynolds stress algebraic equation model performs much better than the k-epsilon model for this class of flows of great practical importance.
Download or read book Treatise on Geophysics Volume 8 written by Peter L. Olson and published by Elsevier. This book was released on 2010-05-18 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treaties on Geophysics: Core Dynamics, Volume 8, provides a comprehensive review of the current state of understanding of core dynamics. The book begins by analyzing a subject of long-standing and on-going controversy: the gross energetics of the core. It then explains the important elements of dynamo theory; actual fluid motions in the core; the basic physical principles involved in thermochemical convection in the core and the basic equations governing the convection; and turbulence and the small-scale dynamics of the core. This is followed by discussions of the state of knowledge on rotation-induced core flows; the use of first-principles numerical models of self-sustaining fluid dynamos; and the behavior of polarity reversals in numerical dynamo models. The remaining chapters cover the various roles the inner core plays in core dynamics and the geodynamo; experiments that have shaped knowledge about the flows in the core that produce the geodynamo and govern its evolution; and ways the mantle can affect core dynamics, and corresponding ways the core can affect the mantle. Self-contained volume starts with an overview of the subject then explores each topic with in depth detail Extensive reference lists and cross references with other volumes to facilitate further research Full-color figures and tables support the text and aid in understanding Content suited for both the expert and non-expert
Download or read book Numerical Investigation of Transversely Injected Pulsed Jets in a Supersonic Flow written by Touraj Sahely and published by . This book was released on 1997 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical and Experimental Investigation of High speed Liquid Jets written by Sam Zakrzewski and published by . This book was released on 2002 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
