vortical flows

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Vortical Flows

Author : Jie-Zhi Wu
ISBN : 9783662470619
Genre : Technology & Engineering
File Size : 77. 61 MB
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This book is a comprehensive and intensive book for graduate students in fluid dynamics as well as scientists, engineers and applied mathematicians. Offering a systematic introduction to the physical theory of vortical flows at graduate level, it considers the theory of vortical flows as a branch of fluid dynamics focusing on shearing process in fluid motion, measured by vorticity. It studies vortical flows according to their natural evolution stages,from being generated to dissipated. As preparation, the first three chapters of the book provide background knowledge for entering vortical flows. The rest of the book deals with vortices and vortical flows, following their natural evolution stages. Of various vortices the primary form is layer-like vortices or shear layers, and secondary but stronger form is axial vortices mainly formed by the rolling up of shear layers. Problems are given at the end of each chapter and Appendix, some for helping understanding the basic theories, and some involving specific applications; but the emphasis of both is always on physical thinking.

Viscous Vortical Flows

Author : Lu Ting
ISBN : 3540537139
Genre : Viscous flow
File Size : 36. 57 MB
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"Addressed to both graduate students and researchers this monograph provides in-depth analyses of vortex dominated flows via matched and multiscale asymptotics, and it demonstrates how insight gained through these analyses can be exploited in the construction of robust, efficient, and accurate numerical techniques. The dynamics of slender vortex filaments is discussed in detail, including fundamental derivations, compressible core structure, weakly nonlinear limit regimes, and associated numerical methods. Similarly, the volume covers asymptotic analysis and computational techniques for weakly compressible flows involving vortex generated sound and thermoacoustics."--BOOK JACKET.

Electrically Induced Vortical Flows

Author : V. Bojarevi°s
ISBN : 9789400911635
Genre : Science
File Size : 73. 78 MB
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Every scientific subject probably conceals unexplored or little investigated strata, which may show up at the proper time when favourable conditions coincide (practical demands, a circle of scientists prepared to recognize the novelty and capable of giving impetus to the development of a new theory, etc.). Something like this occurred in early seventies for magnetohydrodynamics, which at the time was considered to be a relatively complete branch of hydro dynamics with no apparent broad, unexplored areas. It was unexpectedly realized that, in addition to the traditional methods of affecting an electrically conducting medium, there is yet another way, one which subsequently lead to a new direction in magnetohydrodynamics. In the Soviet scientific literature this direction has been termed 'electrically induced vortex flows', the essence of which are hydrodynamic effects due to the interaction of an electric current passing through the fluid with its own magnetic field. It cannot be said that this direction was created ex nihilo: individual studies related to the flows driven in a current-carrying medium in the absence of external magnetic fields appeared in the sixties; in the thirties the flows them selves were known to take place within electrical arcs; and yet the first observa tions on the behaviour of liquid current-carrying conductors were made at the beginning of this century.

Vortical Flows Research Program Of The Fluid Dynamics Research Branch

Author :
ISBN : NASA:31769000574742
Genre :
File Size : 56. 15 MB
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Direct Numerical Simulations Of Highly Vortical Flows And Vortex Breakdown

Author : Wing Tsin Ma
ISBN : CORNELL:31924074538848
Genre :
File Size : 37. 91 MB
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On Issues Concerning Flow Separation And Vortical Flows In 3 Dimensions

Author : D. J. Peake
ISBN : NASA:31769000557010
Genre :
File Size : 24. 8 MB
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Three Dimensional Interactions And Vortical Flows With Emphasis On High Speeds

Author : David J. Peake
ISBN : NASA:31769000547003
Genre : Science
File Size : 65. 43 MB
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The Effect Of Strakes On Vortical Flows Applied To Aircraft

Author : G. G. Ordonez
ISBN : OCLC:227611222
Genre :
File Size : 66. 90 MB
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The influence of strakes placed along vortical flows has been determined in order to define ways of drag reduction on wake-like flow fields present on aircraft afterbodies. Strakes of different aspect ratio and thickness were tested at different angles of incidence with respect to a vortex path in order to evaluate the best configuration which can reduce, or minimise, the cross flow kinetic energy, thus the vortex drag of a vortical flow. The flow field in the vicinity of the boattail of a scale cargo aircraft was studied. The aircraft was tested with and without strakes placed on its afterbody, the results confirm that when strakes are properly placed on the boattail, a reduction in drag is achievable. (Author).

Vortex Dominated Flows

Author : Lu Ting
ISBN : 9783540685821
Genre : Science
File Size : 88. 32 MB
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This monograph provides in-depth analyses of vortex dominated flows via matched and multiscale asymptotics, and demonstrates how insight gained through these analyses can be exploited in the construction of robust, efficient, and accurate numerical techniques. The book explores the dynamics of slender vortex filaments in detail, including fundamental derivations, compressible core structure, weakly non-linear limit regimes, and associated numerical methods. Similarly, the volume covers asymptotic analysis and computational techniques for weakly compressible flows involving vortex-generated sound and thermoacoustics. The book is addressed to both graduate students and researchers.

Transonic Interactions Of Unsteady Vortical Flows

Author : W. J. Mccroskey
ISBN : NASA:31769000565625
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File Size : 54. 98 MB
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Unsteady interactions of strong concentrated vortices, distributed gusts, and sharp-edged gusts with stationary airfoils have been analyzed in two-dimensional transonic flow. A simple and efficient method for introducing such vortical disturbances has been implemented in numerical codes that range from inviscid transonic small disturbance to thin-layer Navier Stokes. The numerical results demonstrate the large distortions in the overall flow field and in the surface air loads that are produced by various vortical interactions. The results of the different codes are in excellent qualitative agreement, but, as might expected, the transonic small-disturbance calculations are deficient in the important region near the leading edge. Keywords include: Gusts, Vortex interaction, Unsteady transonic flow, and Computational aerodynamics.

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