A Study in the Simulation of Atmospheric Turbulence
Author | : Gerald Wayne Smith |
Publisher | : |
Total Pages | : 130 |
Release | : |
Genre | : |
ISBN | : |
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Author | : Gerald Wayne Smith |
Publisher | : |
Total Pages | : 130 |
Release | : |
Genre | : |
ISBN | : |
Author | : Dennis Joseph Martin |
Publisher | : |
Total Pages | : 178 |
Release | : 1979 |
Genre | : Atmospheric turbulence |
ISBN | : |
Author | : John C. Wyngaard |
Publisher | : Cambridge University Press |
Total Pages | : 407 |
Release | : 2010-01-28 |
Genre | : Science |
ISBN | : 1139485520 |
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 | : W. Nixon |
Publisher | : |
Total Pages | : 8 |
Release | : 1983 |
Genre | : Atmosphere |
ISBN | : |
Author | : Evgeni Fedorovich |
Publisher | : Cambridge University Press |
Total Pages | : 312 |
Release | : 2004-10-21 |
Genre | : Science |
ISBN | : 9780521835886 |
Leading researchers come together in this 2004 text to survey recent developments in atmospheric turbulence and mesoscale meteorology.
Author | : Show-Tien Wang |
Publisher | : |
Total Pages | : 180 |
Release | : 1980 |
Genre | : Atmospheric turbulence |
ISBN | : |
Statistical modeling of atmospheric turbulence is discussed. The statistical properties of atmospheric turbulence, in particular the probability distribution, the spectra, and the coherence are reviewed. Different atmospheric turbulence simulation models are investigated, and appropriate statistical analyses are carried out to verify their validity. The models for simulation are incorporated into a computer model of aircraft flight dynamics. Statistical results of computer simulated landings for an aircraft having characteristics of a DC-8 are reported for the different turbulence simulation techniques. The significance of various degrees of sophistication in the turbulence simulation techniques on the landing performance of the aircraft is discussed.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1980 |
Genre | : |
ISBN | : |
A method is described for constructing an artificial temporal sequence of velocity values for simulating atmospheric turbulence. The method develops the conditional probability density distribution of velocity given that the previous value of velocity is known. A value is randomly selected from the conditional probability density which then serves as a known value for the next conditional probability density function. Continuing this procedure provides the desired simulated sequence of velocity values. Based upon this simulation method a program is developed for the Hewlett-Packard HP-29C hand-held calculator for simulating the longitudinal component of atmospheric turbulence during neutral or strong wind conditions.
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : Independently Published |
Total Pages | : 34 |
Release | : 2019-01-13 |
Genre | : Science |
ISBN | : 9781793956866 |
Atmospheric turbulence models are necessary for the design of both inlet/engine and flight controls, as well as for studying coupling between the propulsion and the vehicle structural dynamics for supersonic vehicles. Models based on the Kolmogorov spectrum have been previously utilized to model atmospheric turbulence. In this paper, a more accurate model is developed in its representative fractional order form, typical of atmospheric disturbances. This is accomplished by first scaling the Kolmogorov spectral to convert them into finite energy von Karman forms and then by deriving an explicit fractional circuit-filter type analog for this model. This circuit model is utilized to develop a generalized formulation in frequency domain to approximate the fractional order with the products of first order transfer functions, which enables accurate time domain simulations. The objective of this work is as follows. Given the parameters describing the conditions of atmospheric disturbances, and utilizing the derived formulations, directly compute the transfer function poles and zeros describing these disturbances for acoustic velocity, temperature, pressure, and density. Time domain simulations of representative atmospheric turbulence can then be developed by utilizing these computed transfer functions together with the disturbance frequencies of interest. Kopasakis, George Glenn Research Center NASA/TM-2010-216961, E-17566
Author | : Cedrick Ansorge |
Publisher | : Springer |
Total Pages | : 180 |
Release | : 2016-09-15 |
Genre | : Science |
ISBN | : 3319450441 |
This thesis presents a study of strong stratification and turbulence collapse in the planetary boundary layer, opening a new avenue in this field. It is the first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for representation of turbulence. To date, advances in our understanding and the parameterization of turbulence in the stable boundary layer have been hampered by difficulties simulating the strongly stratified regime, and the analysis has primarily been based on field measurements. The content presented here changes that paradigm by demonstrating the ability of direct numerical simulation to address this problem, and by doing so to remove the uncertainty of turbulence models from the analysis. Employing a stably stratified Ekman layer as a simplified physical model of the stable boundary layer, the three stratification regimes observed in nature— weakly, intermediately and strongly stratified—are reproduced, and the data is subsequently used to answer key, long-standing questions. The main part of the book is organized in three sections, namely a comprehensive introduction, numerics, and physics. The thesis ends with a clear and concise conclusion that distills specific implications for the study of the stable boundary layer. This structure emphasizes the physical results, but at the same time gives relevance to the technical aspects of numerical schemes and post-processing tools. The selection of the relevant literature during the introduction, and its use along the work appropriately combines literature from two research communities: fluid dynamics, and boundary-layer meteorology.
Author | : Julius S. Bendat |
Publisher | : |
Total Pages | : 18 |
Release | : 1955* |
Genre | : Atmospheric turbulence |
ISBN | : |
A mathematical procedure is suggested which helps explain many results observed in power spectral density studies of atmospheric turbulence phenomena. On the basis of empirical evidence, random processes associated with gust velocitie are assumed to have continuous autocorrelation functions of a simple or slightly modified damped exponential-cosine form. Consequences of this assumption are explored. A mechanization is developed to generate on an analog computer various input gust velocity power spectra. Significant engineering results can thus be obtained on the expected operation of existing or proposed physical systems. (Author).