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An Investigation Of The Effects Of Spanwise Wall Oscillation On The Structure Of A Turbulent Boundary Layer
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Book Synopsis An investigation of the effects of spanwise wall oscillation on the structure of a turbulent boundary layer by : Steven Mathew Trujillo
Download or read book An investigation of the effects of spanwise wall oscillation on the structure of a turbulent boundary layer written by Steven Mathew Trujillo and published by . This book was released on 1999 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Boundary Layer Control by Means of Spanwise-wall Oscillation by : Kwing-So Choi
Download or read book Turbulent Boundary Layer Control by Means of Spanwise-wall Oscillation written by Kwing-So Choi and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence Structure and Modulation by : Alfredo Soldati
Download or read book Turbulence Structure and Modulation written by Alfredo Soldati and published by Springer Science & Business Media. This book was released on 2001-07-19 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlling turbulence is an important issue for a number of technological applications. Several methods to modulate turbulence are currently being investigated. All of them are based on the introduction of some sort of perturbation into the flow field which affect turbulence coherent structures responsible for turbulence transfer mechanisms. The scope of the book is to describe several aspects of turbulence structure and modulation and to explain and discuss the most promising techniques in detail.
Book Synopsis The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure by : Albert H. Jeans
Download or read book The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).
Book Synopsis Liutex and Its Applications in Turbulence Research by : Chaoqun Liu
Download or read book Liutex and Its Applications in Turbulence Research written by Chaoqun Liu and published by Academic Press. This book was released on 2020-10-29 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liutex and Its Applications in Turbulence Research reviews the history of vortex definition, provides an accurate mathematical definition of vortices, and explains their applications in flow transition, turbulent flow, flow control, and turbulent flow experiments. The book explains the term "Rortex" as a mathematically defined rigid rotation of fluids or vortex, which could help solve many longstanding problems in turbulence research. The accurate mathematical definition of the vortex is important in a range of industrial contexts, including aerospace, turbine machinery, combustion, and electronic cooling systems, so there are many areas of research that can benefit from the innovations described here. This book provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence. Important theory and methodologies used for developing these laws are described in detail, including: the classification of the conventional turbulent boundary layer concept based on proper velocity scaling; the methodology for identification of the scales of velocity, temperature, and length needed to establish the law; and the discovery, proof, and strict validations of the laws, with both Reynolds and Prandtl number independency properties using DNS data. The establishment of these statistical laws is important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence. Provides an accurate mathematical definition of vortices Provides a thorough survey of the latest research in generalized and flow-thermal, unified, law-of-the-wall for wall-bounded turbulence Explains the term “Rortex as a mathematically defined rigid rotation of fluids or vortex Covers the statistical laws important to modern fluid mechanics and heat transfer research, and greatly expands our understanding of wall-bounded turbulence
Book Synopsis Linearised Navier-Stokes Equations and Near-wall Streaks in Turbulent Flow Subject to Drag Reduction by Wall Oscillations by : Olivier Blesbois
Download or read book Linearised Navier-Stokes Equations and Near-wall Streaks in Turbulent Flow Subject to Drag Reduction by Wall Oscillations written by Olivier Blesbois and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spanwise wall-oscillation is a promising drag reduction technique in turbulent flows. A major factor in drag reduction is the effect of the oscillations on the boundary layer coherent structures, and particularly the weakening of the near-wall streaks. This thesis studies the streaks in various wall oscillations configurations, based on a linear approach to the turbulent flow. The two main aspects are the study of the structures themselves, and an attempt to predict drag. The streak structure is studied mainly in turbulent channel flow subject to harmonic wall forcing, using an optimal perturbation technique. It is shown that the streaks have an angle to the main flow direction, which is almost constant during half an oscillation period and experiences a jump in sign and magnitude twice per period. The linear theory shows that this phenomenon is due to the existence of a structure which is dominant during half a period and has a constant angle. Other features of the linear optimal perturbations are studied, such as their comparison with conditionally averaged turbulent structures. In order to predict drag, the optimal perturbation approach is found to be unsuitable. A more appropriate technique is to use the linearised Navier-Stokes equation subject to random forcing. This was done for a turbulent channel flow subject to travelling wave wall oscillations, thus offering a wide range of comparison with direct numerical simulations, including known regions of drag reduction and drag increase. The main finding is that in the area where drag increase is observed in turbulent flow, the linear operator is unstable. In area where the operator is stable, drag reduction is always predicted. These two topics are the core of this thesis. Other aspects include the derivation and implementation of an optimal perturbation algorithm and a linear solver. Certain theoretical aspects of the optimal perturbation approach were also investigated.
Book Synopsis Thermofluid Dynamics of Turbulent Flows by : Michele Ciofalo
Download or read book Thermofluid Dynamics of Turbulent Flows written by Michele Ciofalo and published by Springer Nature. This book was released on 2021-08-16 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides the theoretical fundamentals on turbulence and a complete overview of turbulence models, from the simplest to the most advanced ones including Direct and Large Eddy Simulation. It mainly focuses on problems of modeling and computation, and provides information regarding the theory of dynamical systems and their bifurcations. It also examines turbulence aspects which are not treated in most existing books on this subject, such as turbulence in free and mixed convection, transient turbulence and transition to turbulence. The book adopts the tensor notation, which is the most appropriate to deal with intrinsically tensor quantities such as stresses and strain rates, and for those who are not familiar with it an Appendix on tensor algebra and tensor notation are provided.
Book Synopsis Proceedings of the International Symposium on Seawater Drag Reduction by :
Download or read book Proceedings of the International Symposium on Seawater Drag Reduction written by and published by . This book was released on 1998 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Turbulent Boundary Layer Structure by : John Leask Lumley
Download or read book A Study of Turbulent Boundary Layer Structure written by John Leask Lumley and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Turbulence Control by : Baochun Fan
Download or read book Principles of Turbulence Control written by Baochun Fan and published by John Wiley & Sons. This book was released on 2022-05-17 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the mathematical techniques for turbulence control in a form suitable for inclusion in an engineering degree program at both undergraduate and postgraduate levels whilst also making it useful to researchers and industrial users of the concepts. It uses a mix of theory, computation and experimental results to present and illustrate the methodologies. It is based on the three part structure, wall turbulence, open loop control and feedback control with emphasis on optimal control methodologies. The book also includes an introduction of basic principles and fundamentals followed by a chapter on the structure of wall turbulence with emphasis on coherent structures. Elsewhere there is focus on control methods of wall turbulence by manipulating the boundaries though their motion and by applying control forces throughout the flow volume. The last two chapters will describe the linear and non-linear optimal controls. This integrated approach will help not only researchers interested in the topic but also graduate or advanced undergraduate students in their course work.
Book Synopsis Investigation of Turbulent Boundary Layer Structure Using Stereoscopic Particle Image Velocimetry by : Bharathram Ganapathisubramani
Download or read book Investigation of Turbulent Boundary Layer Structure Using Stereoscopic Particle Image Velocimetry written by Bharathram Ganapathisubramani and published by . This book was released on 2004 with total page 350 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 1971 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 28th AIAA Fluid Dynamics Conference, 4th AIAA Shear Flow Control Conference by :
Download or read book 28th AIAA Fluid Dynamics Conference, 4th AIAA Shear Flow Control Conference written by and published by . This book was released on 1997 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Statistical Approach to Wall Turbulence by : Sedat Tardu
Download or read book Statistical Approach to Wall Turbulence written by Sedat Tardu and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall turbulence is encountered in many technological applications as well as in the atmosphere, and a detailed understanding leading to its management would have considerable beneficial consequences in many areas. A lot of inspired work by experimenters, theoreticians, engineers and mathematicians has been accomplished over recent decades on this important topic and Statistical Approach to Wall Turbulence provides an updated and integrated view on the progress made in this area. Wall turbulence is a complex phenomenon that has several industrial applications, such as in aerodynamics, turbomachinery, geophysical flows, internal engines, etc. Several books exist on fluid turbulence, but Statistical Approach to Wall Turbulence is original in the sense that it focuses solely on the turbulent flows bounded by solid boundaries. The book covers the different physical aspects of wall turbulence, beginning with classical phenomenological aspects before advancing to recent research in the effects of the Reynolds numbers, near wall coherent structures, and wall turbulent transport process. This book would be of interest to postgraduate and undergraduate students in mechanical, chemical, and aerospace engineering, as well as researchers in aerodynamics, combustion, and all applications of wall turbulence.
Book Synopsis Fluid Mechanics and Fluid Power – Contemporary Research by : Arun K. Saha
Download or read book Fluid Mechanics and Fluid Power – Contemporary Research written by Arun K. Saha and published by Springer. This book was released on 2016-09-20 with total page 1638 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the proceedings of the 42nd National and 5th International Conference on Fluid Mechanics and Fluid Power held at IIT Kanpur in December, 2014.The conference proceedings encapsulate the best deliberations held during the conference. The diversity of participation in the conference, from academia, industry and research laboratories reflects in the articles appearing in the volume. This contributed volume has articles from authors who have participated in the conference on thematic areas such as Fundamental Issues and Perspectives in Fluid Mechanics; Measurement Techniques and Instrumentation; Computational Fluid Dynamics; Instability, Transition and Turbulence; Turbomachinery; Multiphase Flows; Fluid‐Structure Interaction and Flow‐Induced Noise; Microfluidics; Bio‐inspired Fluid Mechanics; Internal Combustion Engines and Gas Turbines; and Specialized Topics. The contents of this volume will prove useful to researchers from industry and academia alike.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of a turbulent boundary layer modified by a spanwise oscillating ribbed wall by : Gianpiero Lenza
Download or read book Study of a turbulent boundary layer modified by a spanwise oscillating ribbed wall written by Gianpiero Lenza and published by . This book was released on 2001 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
