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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The objective of one portion of the Army Research Laboratory program on acoustic propagation on the battlefield is to develop an advanced method of accounting for the effects of anisotropic inhomogeneous turbulence. The approach chosen was to extend the idea of eddies under the assumption that the turbulence field is made up of a multiplicity of isolated eddies of different sizes. This method of describing turbulence is called the Turbule Ensemble Model (TEM). A turbule is defined to be a localized inhomogeneity of any type. The primary types are temperature and velocity inhomogeneities; the term turbule is an extension of the idea of an eddy, which is normally associated with a velocity disturbance. In the TEM, then, the turbulent region is populated with a collection of turbules of different sizes and types with the locations of the turbules chosen according to some rule. Since the program began in 1992, a number of publications have been generated that have dealt with the details of creating and using the TEM concept. This report contains information on these reports including author, title, where copies may be obtained, date, and a brief description.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The objective of one portion of the Army Research Laboratory program on acoustic propagation on the battlefield is to develop an advanced method of accounting for the effects of anisotropic inhomogeneous turbulence. The approach chosen was to extend the idea of eddies under the assumption that the turbulence field is made up of a multiplicity of isolated eddies of different sizes. This method of describing turbulence is called the Turbule Ensemble Model (TEM). A turbule is defined to be a localized inhomogeneity of any type. The primary types are temperature and velocity inhomogeneities; the term turbule is an extension of the idea of an eddy, which is normally associated with a velocity disturbance. In the TEM, then, the turbulent region is populated with a collection of turbules of different sizes and types with the locations of the turbules chosen according to some rule. Since the program began in 1992, a number of publications have been generated that have dealt with the details of creating and using the TEM concept. This report contains information on these reports including author, title, where copies may be obtained, date, and a brief description.
Author: Harry J. Auvermann Publisher: ISBN: Category : Languages : en Pages : 27
Book Description
The objective of one portion of the Army Research Laboratory program on acoustic propagation on the battlefield is to develop an advanced method of accounting for the effects of anisotropic inhomogeneous turbulence. The approach chosen was to extend the idea of eddies uner the assumption that the turbulence field is made up of a multiplicity of isolated eddies of different sizes. This method of describing turbulence is called the Turbule Ensemble Model (TEM). A turbule is defined to be a localized inhomogeneity of any type. The primary types are temperature and velocity inhomogeneities; the term turbule is an extension of the idea of an eddy, which is normally associated with a velocity disturbance. In the TEM, then, the turbulent region is populated with a collection of turbules of different sizes and types with the locations the turbules chosen according to some rule. Since the program began in 1992, a number of publications have been generated that have dealt with the details of creating and using the TEM concept. This report contains information on these reports including author, title, where copies may be obtained, date, and a brief description.
Author: John C. Wyngaard Publisher: Cambridge University Press ISBN: 1139485520 Category : Science Languages : en Pages : 407
Book Description
Based on his over forty years of research and teaching, John C. Wyngaard's textbook is an excellent up-to-date introduction to turbulence in the atmosphere and in engineering flows for advanced students, and a reference work for researchers in the atmospheric sciences. Part I introduces the concepts and equations of turbulence. It includes a rigorous introduction to the principal types of numerical modeling of turbulent flows. Part II describes turbulence in the atmospheric boundary layer. Part III covers the foundations of the statistical representation of turbulence and includes illustrative examples of stochastic problems that can be solved analytically. The book treats atmospheric and engineering turbulence in a unified way, gives clear explanation of the fundamental concepts of modeling turbulence, and has an up-to-date treatment of turbulence in the atmospheric boundary layer. Student exercises are included at the ends of chapters, and worked solutions are available online for use by course instructors.
Author: Robert Sharman Publisher: Springer ISBN: 331923630X Category : Technology & Engineering Languages : en Pages : 529
Book Description
Anyone who has experienced turbulence in flight knows that it is usually not pleasant, and may wonder why this is so difficult to avoid. The book includes papers by various aviation turbulence researchers and provides background into the nature and causes of atmospheric turbulence that affect aircraft motion, and contains surveys of the latest techniques for remote and in situ sensing and forecasting of the turbulence phenomenon. It provides updates on the state-of-the-art research since earlier studies in the 1960s on clear-air turbulence, explains recent new understanding into turbulence generation by thunderstorms, and summarizes future challenges in turbulence prediction and avoidance.
Author: F.T. Nieuwstadt Publisher: Springer Science & Business Media ISBN: 9401091129 Category : Science Languages : en Pages : 375
Book Description
The study of turbulence in the atmosphere has seen considerable progress in the last decade. To put it briefly: boundary-layer meteorology, the branch of atmospheric science that concentrates on turbulence in the lower atmosphere, has moved from the surface layer into the boundary layer itself. The progress has been made on all fronts: theoretical, numerical and observational. On the other hand, air pollution modeling has not seen such a rapid evolution. It has not benefited as much as it should have from the increasing knowledge in the field of atmospheric turbulence. Air pollution modeling is still in many ways based on observations and theories of the surface layer only. This book aims to bring the reader up to date on recent advances in boundary-layer meteorology and to pave the path for applications in air pollution dispersion problems. The text originates from the material presented during a short course on Atmospheric Turbulence and Air Pollution Modeling held in The Hague during September 1981. This course was sponsored and organized by the Royal Netherlands Meteorological Institute, xi xii PREFACE to which both editors are affiliated. The Netherlands Government Ministry of Health and Environmental Protection and the Council of Europe also gave support.
Author: Andrew J. Majda Publisher: Cambridge University Press ISBN: 1107016665 Category : Mathematics Languages : en Pages : 368
Book Description
The authors develop a systematic applied mathematics perspective on the problems associated with filtering complex turbulent systems. The book contains background material from filtering, turbulence theory and numerical analysis, making it suitable for graduate courses as well as for researchers in a range of disciplines where applied mathematics is required.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The Turbule Ensemble Model (TEM) was developed to handle acoustical scattering from anisotropic inhomogeneous turbulence. A turbule is a localized atmospheric inhomogeneity. TEM, then, represents a turbulent region by a collection of turbules of different sizes. Since acoustic sources and sensors are omnidirectional, the scattering volume of the TEM region is ill defined. Scattering properties of individual turbules in TEM show that the majority of scattering originates from a constricted volume, called the effective scattering volume. This is true for a region of homogeneous turbulence and is anticipated to be true for a region of inhomogeneous turbulence, although no calculations have been made. Estimates have been given of the size and shape of the effective scattering volume as a function of turbule size for an experiment conducted in homogeneous turbulence and a uniform atmosphere. In this report, homogeneous turbulence is retained, but an upwardly refracting atmosphere is assumed, resulting in a shadow zone. Inclusion of the shadow zone boundary further limits turbule sizes and locations from which significant signals reach the detector. The finding is that large turbules are less effective scatterers and that effective scattering volumes are large enough for the number of small turbules to be large. Implications of this finding are discussed.
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Author: 
Author: Harry J. Auvermann
Author: Luke N. Storer
Author: John C. Wyngaard
Author: Robert Sharman
Author: Hans A. Panofsky
Author: F.T. Nieuwstadt
Author: Andrew J. Majda
Author: 
Author: John Leask Lumley