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The Effects Of Streamwise Concave Curvature On Turbulent Boundary Layer Structure
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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 The Effects of Streamwise Concave Curvature on Turbalent Boundary Layer Structure by : Albert H. Jeans
Download or read book The Effects of Streamwise Concave Curvature on Turbalent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Concave Curvature on Turbulent Boundary Layer Structure by : Albert Hua Jeans
Download or read book The Effects of Concave Curvature on Turbulent Boundary Layer Structure written by Albert Hua Jeans and published by . This book was released on 1982 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure of Turbulent Boundary Layers on a Concave Surface by : Robert S. Barlow
Download or read book Structure of Turbulent Boundary Layers on a Concave Surface written by Robert S. Barlow and published by . This book was released on 1985 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free-stream Turbulence and Concave Curvature Effects on Heated, Transitional Boundary Layers by : Jungho Kim
Download or read book Free-stream Turbulence and Concave Curvature Effects on Heated, Transitional Boundary Layers written by Jungho Kim and published by . This book was released on 1990 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Heat Transfer and Fluid Dynamics of Concave Surface Curvature by : Peter Bradshaw
Download or read book The Heat Transfer and Fluid Dynamics of Concave Surface Curvature written by Peter Bradshaw and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Observations of the Effects of High Free-stream Turbulence Levels on the Heat Transfer to a Concavely Curved Turbulent Boundary Layer by : Stanford University. Thermosciences Division. Thermosciences Division
Download or read book Observations of the Effects of High Free-stream Turbulence Levels on the Heat Transfer to a Concavely Curved Turbulent Boundary Layer written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1989 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A DNS Study on the Effects of Streamwise Convex Surface Curvature on Coherent Structures in Turbulent Boundary Layers by : Nikunj Harish Dave
Download or read book A DNS Study on the Effects of Streamwise Convex Surface Curvature on Coherent Structures in Turbulent Boundary Layers written by Nikunj Harish Dave and published by . This book was released on 2012 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Streamline Curvature on Turbulent Flow by : Peter Bradshaw
Download or read book Effects of Streamline Curvature on Turbulent Flow written by Peter Bradshaw and published by . This book was released on 1973 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Streamline curvature in the plane of the mean shear produces large changes in the turbulence structure of shear layers, usually an order of magnitude more important than normal pressure gradients and other terms in the mean-motion equations for curved flows. The effects on momentum and heat transfer in boundary layers are noticeable on typical wing sections and are very important on highly-cambered turbomachine blades: turbulence may be nearly eliminated on highly-convex surfaces, while on highly-concave surfaces momentum transfer by quasi-steady longitudinal vortices dominates the ordinary turbulence processes. The greatly enhanced mixing rates of swirling jets and the characteristic non-turbulent cores of trailing vortices are also consequences of the effects of streamline curvature on the turbulence structure. A progress report, comprises a review of current knowledge, a discussion of methods of predicting curvature effects, and a presentation of principles for the guidance of future workers.
Book Synopsis Structure of Turbulent Boundary Layers on a Concave Surface by : R. S. Barlow (Johnston, J. P.)
Download or read book Structure of Turbulent Boundary Layers on a Concave Surface written by R. S. Barlow (Johnston, J. P.) and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of strong, concave curvature on the structure of turbulent boundary layers are investigated using flow visualization and two-component laser-doppler anemometry.
Book Synopsis The Effects of Grid-generated Turbulence on Flat and Concave Turbulent Boundary Layers by : Paul Leslie Johnson
Download or read book The Effects of Grid-generated Turbulence on Flat and Concave Turbulent Boundary Layers written by Paul Leslie Johnson and published by . This book was released on 1989 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Transverse Curvature on the Fluctuating Wall Pressure and Structure of Boundary Layer Turbulence by :
Download or read book The Effect of Transverse Curvature on the Fluctuating Wall Pressure and Structure of Boundary Layer Turbulence written by and published by . This book was released on 1993 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document consists of the text and viewgraphs of a paper presented at the ONR Workshop on Nonequilibrium Turbulence held at Arizona State University in Tempe, Arizona, from 10-1 2 March 1993. This workshop was the first step of an ONR Accelerated Research Initiative (ARI) to establish the state-of-the-art for theory, computation, and experimentation relevant to turbulence in a nonequilibrium state, or, more generally, to turbulence in complex flows. The overall goal of the initiative is to understand the behavior of turbulence in such complex conditions in order to advance our prediction and control capabilities. When a cylinder in axial flow is sufficiently long and thin, the growth of the boundary layer results in its thickness exceeding the radius of the cylinder such that the three-dimensional effects due to transverse curvature cannot be neglected. With this condition, the wall of the cylinder provides less constraint on the outer flow and motion of eddies than is experienced in an equilibrium flat plate boundary layer, introducing an avenue for enhanced inner-layer/outer-layer interaction and modified turbulence activity. In this paper, we present results of measurements of the fluctuating wall pressure and turbulent streamwise velocity in the turbulent boundary layer on a cylinder in axial flow to identify the coherent structures that contribute to the fluctuating pressure at the wall. Determining the influence of transverse curvature on the relationship between the wall pressure and velocity field allows examination of its effect on the structure of equilibrium boundary layer turbulence.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Concave Streamline Curvature on Turbulent Boundary Layers by : A. Prabhu
Download or read book Effect of Concave Streamline Curvature on Turbulent Boundary Layers written by A. Prabhu and published by . This book was released on 1981 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the effect of streamwise wall curvature on compressible turbulent boundary layers by : J. C. Rotta
Download or read book On the effect of streamwise wall curvature on compressible turbulent boundary layers written by J. C. Rotta and published by . This book was released on 1966 with total page 29 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 The Effects of Longitudinal Curvature on Turbulent Two-stream Mixing Layers by : Michael Walter Plesniak
Download or read book The Effects of Longitudinal Curvature on Turbulent Two-stream Mixing Layers written by Michael Walter Plesniak and published by . This book was released on 1989 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
