Download or read book Reprints from Official Yearbook of the Republic of South Africa written by and published by . This book was released on 1986* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Development Framework for High Fidelity Non hydrostatic Simulations of Cross Mountain Flow written by Jorge E. Guerra and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of weather and climate prediction models is steadily progressing toward a unified state where multi-scale processes will be fully resolved on dense uniform, variable, or adaptive meshes. However, we are currently in a transition period where advances in computation, numerical methods, and scientific understanding of detailed atmospheric dynamics are converging and much work remains in all these areas to establish a new generation of operational weather and climate forecasting. This thesis aims to put forth a process for advancing numerical modeling of the atmosphere from formulation to implementation, design of numerical tests, and validation by exploring the detailed dynamics of orographically forced gravity wave breaking. We present a novel, efficient, and high-performance dynamical core, Tempest, and use it to create high resolution non-hydrostatic simulations of wave breaking with the purpose of investigating and informing on the behavior of a gravity wave drag parameterization currently in operational use. We demonstrate the superior properties of the numerical scheme using a variety of tests spanning a wide range of length scales. We further present an extension of the classical linear theory of mountain waves and use this solution in the design of fully nonlinear wave breaking simulations leading to a detailed characterization of gravity wave drag as it is implemented in general circulation models.

Download or read book Forward in Time Differencing for Fluids written by and published by . This book was released on 1999 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally, numerical models for simulating planetary scale weather and climate employ the hydrostatic primitive equations-an abbreviated form of Navier-Stokes equations that neglect vertical accelerations and use simplified inertial forces. 1 Although there is no evidence so far that including nonhydrostatic effects in global models has any physical significance for large scale solutions, there is an apparent trend in the community toward restoring Navier-Stokes equations (or at least their less constrained forms) in global models of atmospheres and oceans. The primary motivation for this is that the state-of-the-art computers already admit resolutions where local nonhydrostatic effects become noticeable. Other advantages include: the convenience of local mesh refinement; better overall accuracy; insubstantial computational overhead relative to hydrostatic models; universality and therefore convenience of maintaining a single large code; as well as conceptual simplicity and mathematical elegancy--features important for education. The few existing nonhydrostatic global models differ in analytic formulation and numerical design, reflecting their different purposes and origins. Much of our present research improves the design of a high-performance numerical model for simulating the flows of moist (and precipitating), rotating, stratified fluids past a specified time-dependent irregular lower boundary. This model is representative of a class of nonhydrostatic atmospheric codes employing the an elastic equations of motion in a terrain-following curvilinear framework, and contains parallel implementations of semi-Lagrangian and Eulerian approximations selectable by the user. The model has been employed in a variety of applications; the quality of results suggest that modern nonoscillatory forward-in-time (NFT) methods are superior to the more traditional centered-in-time-and-space schemes, in terms of accuracy, computational efficiency, flexibility and robustness.

Download or read book Asymptotic Modeling of Atmospheric Flows written by Radyadour Kh. Zeytounian and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work is not exactly a "course", but rather is presented as a monograph in which the author has set forth what are, for the most part, his own results; this is particularly true of Chaps. 7-13. Many of the problems dealt with herein have, since the school year 1975-76, been the subject of a series of graduate lectures at the "Universire des Sciences et Techniques de Lille I" for students preparing for the "Diplome d'Etudes Ap profondies de Mecanique (option fluides)". The writing of this book was thus strongly influenced by the author's own conception of meteorology as a fluid mechanics discipline which is in a privi leged area for the application of singular perturbation techniques. It goes without saying that the modeling of atmospheric flows is a vast and complex problem which is presently the focal point of many research projects. The enonnity of the topic explains why many important questions have not been taken up in this work, even among those which are closely related to the subject treated herein. Nonetheless, the author thought it worthwhile for the development of future research on the modeling of atmospheric flows (from the viewpoint of theoretical fluid mechanics) to bring forth a book specifying the problems which have already been resolved in this field and those which are, as yet, unsolved.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1995 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Weather Review written by and published by . This book was released on 2007 with total page 1652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Oxford Handbook of Non Synoptic Wind Storms written by Horia Hangan and published by Oxford University Press. This book was released on 2021-08-16 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: In different areas of the world, much of the damage due to wind is caused by non-synoptic, local wind storm events, such as tornadoes and downbursts. In North America the damage due to these winds is more than 65% of total wind damage, and there are no guidelines or code implementations to deal with such catastrophic events. As we enter the third decade of the twenty-first century, current research is in its first phase of addressing these types of events, from their characterization, simulation, and loading, to collapse-mode effects on buildings and structures, as well as socioeconomic implications. The need is clear to better understand non-synoptic local winds; properly simulate them; assess the difference in loading between these events and synoptic large-scale winds that have been part of the wind engineering practice for more than five decades; determine their statistics and associated risks; and apply this through guidelines, codes, risk mitigation, and adaptation responses to socioeconomic impact. The Oxford Handbook of Non-Synoptic Wind Storms, led by Dr. Horia Hangan and Dr. Ahsan Kareem, features nearly 30 chapters, contributed by an international panel of leading scientists, scholars, and engineers, that address these issues and stimulate thought, research, and responses to non-synoptic wind storm hazards in North America and worldwide. Together, these articles provide clear definitions of the problems to be tackled, offer a strategic framework for forward-looking research, identify the best-suited tools and methodologies to address the problems at hand, and suggest ways to maximize collaborative planning between the disciplines that will tackle these challenges.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Final Report on the Development and Use of a Numerical Model of Shallow Water Flow Over Topography Carried Out Under N E R C Contract F60 B4 05 written by G. P. Dawson and published by . This book was released on 1981 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1976 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1997 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Study of Hyperbolic Models for Non hydrostatic Shallow Water Flow written by 洪彥仲 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 Mountain Weather Research and Forecasting written by Fotini K. Chow and published by Springer Science & Business Media. This book was released on 2012-08-30 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with a broad understanding of the fundamental principles driving atmospheric flow over complex terrain and provides historical context for recent developments and future direction for researchers and forecasters. The topics in this book are expanded from those presented at the Mountain Weather Workshop, which took place in Whistler, British Columbia, Canada, August 5-8, 2008. The inspiration for the workshop came from the American Meteorological Society (AMS) Mountain Meteorology Committee and was designed to bridge the gap between the research and forecasting communities by providing a forum for extended discussion and joint education. For academic researchers, this book provides some insight into issues important to the forecasting community. For the forecasting community, this book provides training on fundamentals of atmospheric processes over mountainous regions, which are notoriously difficult to predict. The book also helps to provide a better understanding of current research and forecast challenges, including the latest contributions and advancements to the field. The book begins with an overview of mountain weather and forecasting chal- lenges specific to complex terrain, followed by chapters that focus on diurnal mountain/valley flows that develop under calm conditions and dynamically-driven winds under strong forcing. The focus then shifts to other phenomena specific to mountain regions: Alpine foehn, boundary layer and air quality issues, orographic precipitation processes, and microphysics parameterizations. Having covered the major physical processes, the book shifts to observation and modelling techniques used in mountain regions, including model configuration and parameterizations such as turbulence, and model applications in operational forecasting. The book concludes with a discussion of the current state of research and forecasting in complex terrain, including a vision of how to bridge the gap in the future.

Download or read book Non Hydrostatic Free Surface Flows written by Oscar Castro-Orgaz and published by Springer. This book was released on 2017-04-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides essential information on the higher mathematical level of approximation over the gradually varied flow theory, also referred to as the Boussinesq-type theory. In this context, it presents higher order flow equations, together with their applications in a broad range of pertinent engineering and environmental problems, including open channel, groundwater, and granular material flows.

Download or read book Numerical model for transient water flow in non homogeneous soil root systems with groundwater influence written by R. A. Feddes and published by . This book was released on 1978 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Model Applications written by Ismail Yucel and published by BoD – Books on Demand. This book was released on 2012-04-04 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers comprehensive text and reference work on atmospheric models for methods of numerical modeling and important related areas of data assimilation and predictability. It incorporates various aspects of environmental computer modeling including an historical overview of the subject, approximations to land surface and atmospheric physics and dynamics, radiative transfer and applications in satellite remote sensing, and data assimilation. With individual chapters authored by eminent professionals in their respective topics, Advanced Topics in application of atmospheric models try to provide in-depth guidance on some of the key applied in atmospheric models for scientists and modelers.

Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2001 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theses on any subject submitted by the academic libraries in the UK and Ireland.