Download or read book Spectral Characteristics of Surface Layer Turbulence written by and published by . This book was released on 1972 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behaviour of spectra and cospectra of turbulence in the surface layer is described within the framework of similarity theory using wind and temperature fluctuation data obtained in the 1968 AFCRL Kansas experiments. With appropriate normalization, and spectra and cospectra are each reduced to a family of curves which spread out according to z/L at low frequencies but converge to a single universal curve in the intertial subrange. The paper compares these results with data obtained by other investigators over both land and water. Spectral constants for velocity and temperature are determined and the variability in the recent estimates of the constants is discussed.
Download or read book Spectral Characteristics and Statistics of Surface Layer Turbulence Over the Tropical Ocean written by Eric Duane Leavitt and published by . This book was released on 1973 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Characteristics of Boundary Layer Turbulence Over Irregular Terrain written by Rae Ann Eversole and published by . This book was released on 1979 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Characteristics of the Marine Surface Layer written by and published by . This book was released on 1996 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research is to gain a better understanding of the processes affecting the near-surface' flow in marine surface layer. The first objective is to improve our understanding of flux profile relationships over the ocean using our mean and flux measurements and the TKE budget equation. This has involved an investigation of the applicability of similarity theory to over-ocean% measurement in order to determine these functions and their proportionality factors. The result of this investigation have shown that the turbulence statistics are similar to those computed over land as long as one is well above the wave boundary layer (WBL). The second objective is to gain a better understanding of the role that stress/wave interaction plays in these processes. The measurement of these profiles in both shallow water and open-ocean settings is allowing us to develop dimensionless functions that are valid anywhere in the constant flux layer. The results of this research that the behavior of the turbulence in the WBL is strongly affected by the wave induced flow. The height of the WBL can be a substantial portion of the surface layer depending on the wave state.
Download or read book Certain Results of Investigation of Atmospheric Surface Layer Turbulence written by G. E. Lesnik and published by . This book was released on 1968 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental data are given on dispersion and time of averaging for pulsations of wind speed and temperatures, correlation, structural, and spectral characteristics of turbulence over a wide interval of scales. Balance of energy of turbulence also is examined. (Author).
Download or read book Spectral and Bulk Properties of Turbulence in the Surface Layer of Air Over the Sea written by John Roy Garratt and published by . This book was released on 1969 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRREL Report written by and published by . This book was released on 1987 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Properties of Turbulent Energy Spectra and Cospectra in the Atmospheric Surface Layer written by Harrison Emery Cramer and published by . This book was released on 1969 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes turbulent energy spectra and cospectra, and other properties of turbulence in the atmospheric surface layer, obtained from an analysis of comprehensive field measurements made over a period of several years at the Round Hill Field Station. Representative power spectra of air temperature and the orthogonal compoenents of wind velocity and cospectra of the vertical fluxes of sensible heat and momentum are presented for the frequency band from 0.4 to 0.0015 cycles per second. The dependence of the spectra and cospectra on height above ground thermal stratification, and surface roughness is discussed. Calculations of the scales of turbulence and energy dissipation rates are summarized and the correspondence between the measured properties of turbulence structure and various Similarity Theory predictions is outlined. (Author).
Download or read book Turbulence and Coherent Structures written by O. Métais and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last 25 years, one of the most striking advances in Fluid Mecha nics was certainly the discovery of coherent structures in turbulence: lab oratory experiments and numerical simulations have shown that most turbulent flows exhibit both spatially-organized large-scale structures and disorganized motions, generally at smaller scales. The develop ment of new measurement and visualization techniques have allowed a more precise characterization and investigation of these structures in the laboratory. Thanks to the unprecedented increase of computer power and to the development of efficient interactive three-dimensional colour graphics, computational fluid dynamicists can explore the still myste rious world of turbulence. However, many problems remain unsolved concerning the origin of these structures, their dynamics, and their in teraction with the disorganized motions. In this book will be found the latest results of experimentalists, theoreticians and numerical modellers interested in these topics. These coherent structures may appear on airplane wings or slender bodies, mixing layers, jets, wakes or boundary-layers. In free-shear flows and in boundary layers, the results presented here highlight the intense three-dimensional character of the vortices. The two-dimensional large scale eddies are very sensitive to three-dimensional perturbations, whose amplification leads to the formation of three-dimensional coherent vorti cal structures, such as streamwise, hairpin or horseshoe vortex filaments. This book focuses on modern aspects of turbulence study. Relations between turbulence theory and optimal control theory in mathematics are discussed. This may have important applications with regard to, e. g. , numerical weather forecasting.
Download or read book The Near Surface Layer of the Ocean written by Alexander Soloviev and published by Springer Science & Business Media. This book was released on 2006-03-13 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until the 1980s, a tacit agreement among many physical oceanographers was that nothing deserving attention could be found in the upper few meters of the ocean. The lack of adequete knowledge about the near-surface layer of the ocean was mainly due to the fact that the widely used oceanographic instruments (such as bathythermographs, CTDs, current meters, etc.) were practically useless in the upper few meters of the ocean. Interest in the ne- surface layer of the ocean rapidly increased along with the development of remote sensing techniques. The interpretation of ocean surface signals sensed from satellites demanded thorough knowledge of upper ocean processes and their connection to the ocean interior. Despite its accessibility to the investigator, the near-surface layer of the ocean is not a simple subject of experimental study. Random, sometimes huge, vertical motions of the ocean surface due to surface waves are a serious complication for collecting quality data close to the ocean surface. The supposedly minor problem of avoiding disturbances from ships’ wakes has frustrated several generations of oceanographers attempting to take reliable data from the upper few meters of the ocean. Important practical applications nevertheless demanded action, and as a result several pioneering works in the 1970s and 1980s laid the foundation for the new subject of oceanography – the near-surface layer of the ocean.
Download or read book IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow written by Alexander J. Smits and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents selected papers from the IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, convened in Princeton, NJ, USA, September I1-13, 2002. The behavior ofturbulence at high Reynolds number is interesting from a fundamental point of view, in that most theories of turbulence make very specific predictions in the limit of infinite Reynolds number. From a more practical point of view, there exist many applications that involve turbulent flow where the Reynolds numbers are extremely large. For example, large vehicles such as submarines and commercial transports operate at Reynolds 9 numbers based on length ofthe order oft0 , and industrial pipe flows cover a 7 very wide range of Reynolds numbers up to 10 • Many very important applications of high Reynolds number flow pertain to atmospheric and other geophysical flows where extremely high Reynolds numbers are the rule rather than the exception, and the understanding of climate changes and the prediction of destructive weather effects hinges to some extent on our appreciation ofhigh-Reynolds number turbulence behavior. The important effects of Reynolds number on turbulence has received a great deal of recent attention. The objective of the Symposium was to bring together many of the world's experts in this area to appraise the new experimental results, discuss new scaling laws and turbulence models, and to enhance our mutual understanding of turbulence.
Download or read book Atmospheric Boundary Layer Flows written by J. C. Kaimal and published by Oxford University Press. This book was released on 1994-01-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer meteorology is the study of the physical processes that take place in the layer of air that is most influenced by the earth's underlying surface. This text/reference gives an uncomplicated view of the structure of the boundary layer, the instruments available for measuring its mean and turbulent properties, how best to make the measurements, and ways to process and analyze the data. The main applications of the book are in atmospheric modelling, wind engineering, air pollution, and agricultural meteorology. The authors have pioneered research on atmospheric turbulence and flow, and are noted for their contributions to the study of the boundary layer. This important work will interest atmospheric scientists, meteorologists, and students and faculty in these fields.
Download or read book Research Paper RM written by and published by . This book was released on 1989 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaporation into the Atmosphere written by W. Brutsaert and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of evaporation in the natural environment is of interest in various diverse disciplines. This book is an attempt to present a coherent and organized introduction to theoretical concepts and relationships useful in analyzing this phe nomenon, and to give an outline of their history and their application. The main objective is to provide a better understanding of evaporation, and to connect some of the approaches and paradigms, that have been developed in different disciplines concerned with this phenomenon. The book is intended for professional scientists and engineers, who are active in hydrology, meteorology, agronomy, oceanography, climatology and related environ mental fields, and who wish to study prevailing concepts on evaporation. At the same time, I hope that the book will be useful to workers in fluid dynamics, who want to become acquainted with applications to an important and interesting natural phenomenon. As suggested in its subtitle, the book consists of three major parts. The first, consisting of Chapters I and 2, gives a general ouline of the problem and a history of the theories of evaporation from ancient times through the end of the nineteenth century. This history is far from exhaustive, but it sket~hes the background and the ideas that led directly to the scientific revolution in Europe and, ultimately, to our present-day knowledge.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1975 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kansas 1968 Field Program Data Report written by Yutaka Izumi and published by . This book was released on 1971 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: A field program in micrometeorology was conducted by the Boundary Layer Branch, Meteorology Laboratory, Air Force Cambridge Research Laboratories during the summer of 1968 in southwest Kansas. Measurements of vertical transport of momentum and sensible heat as well as vertical profiles of wind and temperature were obtained. The profile and turbulence statistical data are presented in this report. (Author).
Download or read book Environmental Research Papers written by and published by . This book was released on 1971 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
