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Turbulence Measurements In Stably Stratified Fluids
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Book Synopsis Turbulence Measurements in Stably Stratified Fluids by : y. H. Pao
Download or read book Turbulence Measurements in Stably Stratified Fluids written by y. H. Pao and published by . This book was released on 1970 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A towing tank system was used to study the structure of turbulence in stably stratified fluids. Turbulence is generated by moving an obstacle (a grid or a cylinder) in a tank of stratified salt water. Recent improved shadowgraph pictures of these laboratory generated stratified flows are shown in the paper. They give further support to Pao's observation that (1) internal waves and turbulence coexist in turbulent stratified flows, with internal waves at the large scales and turbulence at the small scales; (2) turbulence decays much more rapidly than internal waves; and (3) the turbulent-nonturbulent interfaces are not necessarily sharp, and the transition region may consist of mostly internal waves. Diagnostic methods to distinguish internal waves from turbulence with two probe measurements are proposed. (Author).
Book Synopsis Spectra of Internal Waves and Turbulence in Stratified Fluids. Part I. General Discussion and Indications from Measurements in Stably Stratified Atmosphere and Ocean by : Yih-Ho Pao
Download or read book Spectra of Internal Waves and Turbulence in Stratified Fluids. Part I. General Discussion and Indications from Measurements in Stably Stratified Atmosphere and Ocean written by Yih-Ho Pao and published by . This book was released on 1969 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unified spectral description of internal waves and turbulence in stably stratified atmosphere and ocean is proposed. We envisage that the fluctuating motions in a free atmosphere with scales smaller than the synoptic scale consist of internal waves and turbulence. At low wavenumbers, internal waves predominate; this range of wavenumbers may be called the internal wave subrange. The internal waves can be identified from the characteristics of velocity-scalar co-spectra and quadrature-spectra, as shown recently by Pao in a laboratory experiment. When the internal waves are sufficiently strong and distinct, the different harmonics of internal waves may present themselves in the auto-spectra of velocity and temperature, where the peaks and valleys are clearly identifiable. This, we believe, explains the presence of peaks and valleys in some velocity auto-spectra of clear air turbulence measured in strongly stratified regions of the atmosphere. At intermediate wavenumbers (buoyant subrange), the buoyancy effect is still strong but the turbulent scrambling process becomes important; the higher-order harmonics of internal waves are no longer distinct and cannnot be detected in the auto-spectra. (Author).
Book Synopsis Nonintrusive Optical Measurements of Turbulence and Mixing in a Stably Stratified Fluid by : Todd Kent Barrett
Download or read book Nonintrusive Optical Measurements of Turbulence and Mixing in a Stably Stratified Fluid written by Todd Kent Barrett and published by . This book was released on 1989 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer by : Cedrick Ansorge
Download or read book Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer written by Cedrick Ansorge and published by Springer. This book was released on 2016-09-15 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Turbulence Measurements in Stably Stratified Flows by : Yih-Ho Pao
Download or read book Turbulence Measurements in Stably Stratified Flows written by Yih-Ho Pao and published by . This book was released on 1970 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectra of Internal Waves and Turbulence in Stratified Fluids: General discussion and indications from measurements in stably stratified atmosphere and ocean by :
Download or read book Spectra of Internal Waves and Turbulence in Stratified Fluids: General discussion and indications from measurements in stably stratified atmosphere and ocean written by and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Introduction to Turbulence and its Measurement by : P Bradshaw
Download or read book An Introduction to Turbulence and its Measurement written by P Bradshaw and published by Elsevier. This book was released on 2013-10-22 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Turbulence and Its Measurement is an introductory text on turbulence and its measurement. It combines the physics of turbulence with measurement techniques and covers topics ranging from measurable quantities and their physical significance to the analysis of fluctuating signals, temperature and concentration measurements, and the hot-wire anemometer. Examples of turbulent flows are presented. This book is comprised of eight chapters and begins with an overview of the physics of turbulence, paying particular attention to Newton's second law of motion, the Newtonian viscous fluid, and equations of motion. After a chapter devoted to measurable quantities, the discussion turns to some examples of turbulent flows, including turbulence behind a grid of bars, Couette flow, atmospheric and oceanic turbulence, and heat and mass transfer. The next chapter describes measurement techniques using hot wires, films, and thermistors, as well as Doppler-shift anemometers; glow-discharge or corona-discharge anemometers; pulsed-wire anemometer; and steady-flow techniques for fluctuation measurement. This monograph is intended for post-graduate students of aeronautics and fluid mechanics, but should also be readily understandable to those with a good general background in engineering fluid dynamics.
Book Synopsis Turbulent Velocity and Scalar Spectra in Stably Stratified Fluids by : Yih-Ho Pao
Download or read book Turbulent Velocity and Scalar Spectra in Stably Stratified Fluids written by Yih-Ho Pao and published by . This book was released on 1968 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the complete set of two-point covariance equations for the turbulent velocity and temperature fields, the spherically averaged spectra in stably stratified fluids are deduced for the entire locally homogeneous ranges of wave numbers, including buoyancy, inertial, and viscous subranges. The spectral equations are closed with a similarity hypothesis (Pao, 1965, 1968). The predicted spectral behavior in the buoyancy subrange can be summarized as follows: (1) the spectra in weakly stable fluids agree in general, although differ in detail, with those predicted by Bolgiano (1959), Monin (1962), Shur (1962), and Lumley (1964), that the velocity spectra are steeper than k to the -5/3 power and the temperature spectra are less steep than k to the -5/3 power; (2) in strongly stable fluids, both the velocity and the temperature spectra are wavy, which resemble certain spectral measurements in high altitude clear air turbulence (Reiter and Burns, 1966; Pinus, Shur and Vinnichenko, 1966; Crooks, Hoblit and Prophet, 1967). (Author).
Book Synopsis Spectra of Internal Waves and Turbulence in Stratified Fluids by : Yih-Ho Pao
Download or read book Spectra of Internal Waves and Turbulence in Stratified Fluids written by Yih-Ho Pao and published by . This book was released on 1969 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Undulance and Turbulence in Stably Stratified Media by : Yih-Ho Pao
Download or read book Undulance and Turbulence in Stably Stratified Media written by Yih-Ho Pao and published by . This book was released on 1968 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin and the structure of undulance and turbulence in stably stratified media are investigated through theoretical reasoning and laboratory experiments. The mechanisms for generating turbulence in stably stratified media are linked with the mechanisms for generating vorticity - shear and stratification. The dual role of stable stratification -- the capability for generating and attenuating turbulence -- is pointed out. The turbulence induced by stable stratification is evidenced in two experimental results: (1) turbulent rotors in the lee of a barrier in a stably stratified fluid, and (2) the breaking of traveling internal waves on a sloping surface. The ability of stable stratification to generate turbulence is also indicated from an exact solution for an inviscid stably stratified flow past a barrier. The structure of undulance and turbulence in stably stratified media is investigated in a stratified salt water towing tank, with schlieren photographs, quartz-coated hot-film probes, and single electrode conductivity probes. The schlieren photographs show clearly the collapse of a turbulent wake and the attenuation of turbulence by stable stratification. Auto-correlations and -spectra for the streamwise turbulent velocity field and for the turbulent concentration field are obtained. From the measured correlations and spectra, the combined wave-turbulence behavior is clearly shown, and the turbulence is strongly anisotropic. (Author).
Book Synopsis Waves and Turbulence in Stably Stratified Fluids by : F. P. Bretherton
Download or read book Waves and Turbulence in Stably Stratified Fluids written by F. P. Bretherton and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence in Rotating, Stratified and Electrically Conducting Fluids by : P. A. Davidson
Download or read book Turbulence in Rotating, Stratified and Electrically Conducting Fluids written by P. A. Davidson and published by Cambridge University Press. This book was released on 2013-09-12 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are two recurring themes in astrophysical and geophysical fluid mechanics: waves and turbulence. This book investigates how turbulence responds to rotation, stratification or magnetic fields, identifying common themes, where they exist, as well as the essential differences which inevitably arise between different classes of flow. The discussion is developed from first principles, making the book suitable for graduate students as well as professional researchers. The author focuses first on the fundamentals and then progresses to such topics as the atmospheric boundary layer, turbulence in the upper atmosphere, turbulence in the core of the earth, zonal winds in the giant planets, turbulence within the interior of the sun, the solar wind, and turbulent flows in accretion discs. The book will appeal to engineers, geophysicists, astrophysicists and applied mathematicians who are interested in naturally occurring turbulent flows.
Book Synopsis Turbulence Measurements and Flow Modeling by : Ching Jen Chen
Download or read book Turbulence Measurements and Flow Modeling written by Ching Jen Chen and published by CRC Press. This book was released on 1987 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence and Diffusion in Stable Environments by : Julian C. R. Hunt
Download or read book Turbulence and Diffusion in Stable Environments written by Julian C. R. Hunt and published by Oxford University Press, USA. This book was released on 1985 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Book Synopsis On Predicting the Transition to Turbulence in Stably Stratified Fluids by :
Download or read book On Predicting the Transition to Turbulence in Stably Stratified Fluids written by and published by . This book was released on 1997 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of turbulence in stratified fluids has historically been studied using the flux, Ri{sub f}, and the gradient Richardson no., Ri, whereas the simpler shear flow transition in homogeneous fluids has been studied using the Reynolds no. A complete dimensional analysis dimensional analysis of the relevant linearized conservation equations in the Boussinesq approximation predicts that the physical processes in stably stratified boundary layers should depend on as many as five dimensionless parameters, namely, the Rayleigh no, Ra, the Reynolds no., Re, the Taylor no., Ta, the Prandtl no., Pr, and the Radiation no., Rd. The Radiation no. is very similar to Pr, but includes thermal radiative transfer instead of molecular heat conduction.
Book Synopsis Buoyancy Effects in Fluids by : J. S. Turner
Download or read book Buoyancy Effects in Fluids written by J. S. Turner and published by Cambridge University Press. This book was released on 1979-12-20 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomena treated in this book all depend on the action of gravity on small density differences in a non-rotating fluid. The author gives a connected account of the various motions which can be driven or influenced by buoyancy forces in a stratified fluid, including internal waves, turbulent shear flows and buoyant convection. This excellent introduction to a rapidly developing field, first published in 1973, can be used as the basis of graduate courses in university departments of meteorology, oceanography and various branches of engineering. This edition is reprinted with corrections, and extra references have been added to allow readers to bring themselves up to date on specific topics. Professor Turner is a physicist with a special interest in laboratory modelling of small-scale geophysical processes. An important feature is the superb illustration of the text with many fine photographs of laboratory experiments and natural phenomena.
Book Synopsis Environmental Fluid Dynamics by : Jorg Imberger
Download or read book Environmental Fluid Dynamics written by Jorg Imberger and published by Academic Press. This book was released on 2012-09-06 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: A broad cross-section of scientists working in aquatic environments will enjoy this treatment of environmental fluid dynamics, a foundation for elucidating the importance of hydrodynamics and hydrology in the regulation of energy.
