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Quantitative Visualization Of Three Dimensional Flow Separation And Vortex Structures By Particle Displacement Velocimetry
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Book Synopsis Quantitative Visualization of Three-dimensional Flow Separation and Vortex Structures by Particle Displacement Velocimetry by : Thomas Chung-Yee Fu
Download or read book Quantitative Visualization of Three-dimensional Flow Separation and Vortex Structures by Particle Displacement Velocimetry written by Thomas Chung-Yee Fu and published by . This book was released on 1993 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Vortex-body Interaction in a Viscous Fluid by : Jeffrey S. Marshall
Download or read book Three-dimensional Vortex-body Interaction in a Viscous Fluid written by Jeffrey S. Marshall and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and computational study of the impact of a vortex with a body oriented normal to the vortex axis was performed. Particular focus was placed on understanding characteristics of the secondary vorticity ejected from the body and the interaction of the secondary vorticity with the primary vortex. Since both onset of boundary layer separation and the form of the secondary vorticity structures are sensitive to variation of the velocity normal to the body axis, the effect of normal velocity on vortex-body interaction was carefully examined. The physical features of the flow evolution were categorized in terms of an impact parameter and a thickness parameter, which respectively represent ratios of velocity and length scales associated with the vortex to those associated with the flow in the absence of the vortex. Experiments were performed using a combination of laser-induced fluorescence (LIF) flow visualization and particle-image velocimetry (PIV) in a water tank to examine the form of the secondary vorticity structures with both "high" and "low" values of the impact parameter for normal vortex interaction with a circular cylinder and with a thin blade. A new type of Lagrangian vorticity method based on a tetrahedral mesh was developed and applied to compute the secondary vorticity evolution during vortex-cylinder interaction. Computations were also performed for model problems to examine in detail wrapping of a vortex loop around a columnar vortex and impulsive cutting of a columnar vortex with finite axial flow.
Book Synopsis Quantitative Three Dimensional Flow Visualization Using Stereoscopic Particle Streak Velocimetry by : Phil S. Kuhlman
Download or read book Quantitative Three Dimensional Flow Visualization Using Stereoscopic Particle Streak Velocimetry written by Phil S. Kuhlman and published by . This book was released on 1990 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Separated Flow Topology by : Jean Délery
Download or read book Three-dimensional Separated Flow Topology written by Jean Délery and published by John Wiley & Sons. This book was released on 2013-02-28 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops concepts and a methodology for a rational description of the organization of three-dimensional flows considering, in particular, the case where the flow is the place of separations. The descriptive analysis based on the critical point theory of Poincaré develops conventional but rather unfamiliar considerations from aerodynamicists, who face the understanding of complex flows including multiple separation lines and vortices. These problems concern industrial sectors where aerodynamics plays a key role, such as aerospace, ground vehicles, buildings, etc. Contents 1. Skin Friction Lines Pattern and Critical Points. 2. Separation Streamsurfaces and Vortex Structures. 3. Separated Flow on a Body. 4. Vortex Wake of Wings and Slender Bodies. 5. Separation Induced by an Obstacle or a Blunt Body. 6. Reconsideration of the Two-Dimensional Separation. 7. Concluding Remarks. About the Authors Jean Délery is a Supaero (French National Higher School of Aeronautics and Space) engineer who has worked at Onera (French national aerospace research center) since 1964. He has participated in several major French and European aerospace programs, is the author of many scientific publications, and has occupied various teaching positions particularly at Supaero, the University of Versailles-Saint-Quentin, Ecole polytechnique in France and “La Sapienza” University in Rome, Italy. He is currently emeritus adviser at Onera.
Book Synopsis Twenty-First Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of the Fine-scale Three-dimensional Flow Structures in Turbulence Using Time-resolved Stereoscopic Scanning Particle Image Velocimetry by : Ye Cheng
Download or read book A Study of the Fine-scale Three-dimensional Flow Structures in Turbulence Using Time-resolved Stereoscopic Scanning Particle Image Velocimetry written by Ye Cheng and published by . This book was released on 2011 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: A time-resolved stereoscopic scanning particle image velocimetry (TR-SSPIV) system was developed to investigate the fine-scale 3D structures in free shear turbulent jets. The system provided a simultaneous measurement of the three-component velocity field in a three-dimensional volume (3D3C) with Kolmogorov-scale (eta) resolution, providing a true representation of the complete nine-component velocity gradient tensor. Quantitative visualization of the coherent structures at fine-scale turbulence is obtained and four basic structural shapes (sheets, tube, square ribbons and spherical blobs) are identified as building blocks of complex turbulent structures. The measurement volume had dimensions of 43eta x 20eta x 18eta, which allowed isolating individual structures. These rendered shapes had dimensions that range from 1.5-5eta to 20-30eta. The local acceleration du/dt is obtained and represented as 3D structures. These showed a strong anti-alignment with the convective acceleration term, which helps validate experimentally the Random Taylor Hypothesis. A novel vortex identification scheme is also introduced based on the local pressure. The method is compared to other published ones including enstrophy, Q, Lambda2 and Delta criteria. Four different flow configurations are tested and extensive statistical analyses are performed to study the probability density function (PDF), joint PDF, and spectra of the velocity gradients. The analysis also considered the vorticity, rate of strain, enstrophy, and dynamic parameters such as enstrophy production rate and energy dissipation rate. Accuracy assessments included result comparison to isotropy theory and evaluation of the local conservation of mass. The flow statistics and scaling of turbulence at fine scales are compared extensively to published theoretical, numerical, and experimental results.
Book Synopsis Flow-visualization of Three-dimensional Boundary-layer Separation on Bodies of Revolution at Incidence by : Taeyoung Han
Download or read book Flow-visualization of Three-dimensional Boundary-layer Separation on Bodies of Revolution at Incidence written by Taeyoung Han and published by . This book was released on 1977 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface streamline patterns on three bodies of revolution, namely a spheroid, a low-drag body and a hemisphere-hemispheroid combination body, have been examined at several angles of attack. Most of the tests were performed at low Reynolds numbers in a hydraulic flume using colored dye to make the surface flow visible. A limited number of experiments was also carried out in a wind tunnel, using wool tufts, to study the influence of Reynolds number and turbulent separation. The study has verified some of the important qualitative features of three-dimensional separation criteria proposed earlier by Maskell, Lighthill, Wang and others. The observed locations of laminar separation lines on a spheroid at various incidences have been compared with the numerical boundary-layer solutions of Wang, and it is suggested that the quantitative differences may be attributed to the significant viscous-inviscid interaction, especially at large incidences. (Author).
Book Synopsis Particle Image Velocimetry by : Markus Raffel
Download or read book Particle Image Velocimetry written by Markus Raffel and published by Springer Science & Business Media. This book was released on 2007-08-09 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This immensely practical guide to PIV provides a condensed, yet exhaustive guide to most of the information needed for experiments employing the technique. This second edition has updated chapters on the principles and extra information on microscopic, high-speed and three component measurements as well as a description of advanced evaluation techniques. What’s more, the huge increase in the range of possible applications has been taken into account as the chapter describing these applications of the PIV technique has been expanded.
Book Synopsis Computation of Navier-Stokes Equations for Three-dimensional Flow Separation by :
Download or read book Computation of Navier-Stokes Equations for Three-dimensional Flow Separation written by and published by . This book was released on 1989 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Three Dimensional Turbulent Boundary Layer Separation and Vortex Flow Control Using the Reduced Navier Stokes Equations by :
Download or read book A Study of Three Dimensional Turbulent Boundary Layer Separation and Vortex Flow Control Using the Reduced Navier Stokes Equations written by and published by . This book was released on 1991 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Anemometry written by and published by . This book was released on 1994 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure of Three-dimensional Separated Flows in Obstacle-boundary Layer Interactions by : Raymond Sedney
Download or read book The Structure of Three-dimensional Separated Flows in Obstacle-boundary Layer Interactions written by Raymond Sedney and published by . This book was released on 1975 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject is investigated with flow visualization techniques; the turbulent boundary layer on the wall of a continuous supersonic wind tunnel is used. Sizeable separated flow regions can be studied since the wall width is 38cm and the boundary layer is typically 2.5cm thick. The large scale of the experiment is required to resolve the fine details of the flow structure. The flow visualization techniques are discussed. The structure of the separated flow upstream of the obstacle is seen to change with relatively small changes in Reynolds number R; the number of vortices varies from 6 to 4 to 2 as R changes. Data are presented for large and small protuberances, but the latter are emphasized.
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 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Formation in the Starting Flow of Rotating, Low-Aspect-Ratio Plates by : Adam DeVoria
Download or read book Vortex Formation in the Starting Flow of Rotating, Low-Aspect-Ratio Plates written by Adam DeVoria and published by . This book was released on 2011 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three-dimensional vortex formation of a low-aspect-ratio (AR = 1.7), trapezoidal flat plate performing low Reynolds number (order 10^3) pure rotation from rest at a 90° angle of attack and is experimentally investigated. The objectives are to characterize the time-dependent, three-dimensional vortex structure as the plate motion progresses, to ascertain the ramifications of the significant root-to-tip flow on the vortex formation, and to determine the presence of and subsequently investigate any evidence of vortex saturation ("formation parameter") effects. The experiments are conducted in a glass water tank facility, and the diagnostics tools used are dye flow visualization and planar digital particle image velocimetry (DPIV). The vortex structures created by the low-aspect-ratio plate are symmetric ring-like vortices comprised mainly of vorticity generated at the tip edge of the plate. For large rotation amplitudes the dye flow visualization shows the shedding of this ring-like vortex end even the generation of a secondary ring-like vortex, all while the plate is still in motion, indicating the saturation of the primary vortex. The time-varying vortex circulation, calculated from the DPIV measurements in the symmetry plane of the flow, provides quantitative evidence of vortex saturation. It was found that the temporal development of the vortex circulation is complex, which obscures the objective determination of physically relevant saturation times. This difficulty is a direct result of an interaction between the evolving formation of the final ring-like vortex via Kelvin-Helmholtz-like instabilities that are inherent in the separated shear layers emanating from the free edges of the plate, and the strong root-to-tip flow, which is induced by the tip-edge- and side-edge-vortices.
Book Synopsis Vortex Methods and Vortex Motion by : Karl E. Gustafson
Download or read book Vortex Methods and Vortex Motion written by Karl E. Gustafson and published by SIAM. This book was released on 1991-01-01 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vortex methods have emerged as a new class of powerful numerical techniques to analyze and compute vortex motion. This book addresses the theoretical, numerical, computational, and physical aspects of vortex methods and vortex motion. Vortex phenomena in fluid flows and the experimental, theoretical, and numerical methods used to characterize them are discussed in reviews by leading experts. Extensive photographs and sample computer graphics are provided. The development of large vortex structure in fluid flow is responsible for some of the most fascinating aspects of fluid dynamics, such as mixing, shearing, transport, and instability. Such issues arise in a variety of flow regimes, ranging from fundamental mathematical questions in laminar, transitional, and turbulent flow to sophisticated engineering settings and devices.
Author :Ernst Heinrich Hirschel Publisher :Springer Science & Business Media ISBN 13 :3642413781 Total Pages :396 pages Book Rating :4.6/5 (424 download)
Book Synopsis Three-Dimensional Attached Viscous Flow by : Ernst Heinrich Hirschel
Download or read book Three-Dimensional Attached Viscous Flow written by Ernst Heinrich Hirschel and published by Springer Science & Business Media. This book was released on 2013-10-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viscous flow is treated usually in the frame of boundary-layer theory and as two-dimensional flow. Books on boundary layers give at most the describing equations for three-dimensional boundary layers, and solutions often only for some special cases. This book provides basic principles and theoretical foundations regarding three-dimensional attached viscous flow. Emphasis is put on general three-dimensional attached viscous flows and not on three-dimensional boundary layers. This wider scope is necessary in view of the theoretical and practical problems to be mastered in practice. The topics are weak, strong, and global interaction, the locality principle, properties of three-dimensional viscous flow, thermal surface effects, characteristic properties, wall compatibility conditions, connections between inviscid and viscous flow, flow topology, quasi-one- and two-dimensional flows, laminar-turbulent transition and turbulence. Though the primary flight speed range is that of civil air transport vehicles, flows past other flying vehicles up to hypersonic speeds are also considered. Emphasis is put on general three-dimensional attached viscous flows and not on three-dimensional boundary layers, as this wider scope is necessary in view of the theoretical and practical problems that have to be overcome in practice. The specific topics covered include weak, strong, and global interaction; the locality principle; properties of three-dimensional viscous flows; thermal surface effects; characteristic properties; wall compatibility conditions; connections between inviscid and viscous flows; flow topology; quasi-one- and two-dimensional flows; laminar-turbulent transition; and turbulence. Detailed discussions of examples illustrate these topics and the relevant phenomena encountered in three-dimensional viscous flows. The full governing equations, reference-temperature relations for qualitative considerations and estimations of flow properties, and coordinates for fuselages and wings are also provided. Sample problems with solutions allow readers to test their understanding.
Download or read book NASA SP. written by and published by . This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
