Vortical Flows
Title | Vortical Flows PDF eBook |
Author | Jie-Zhi Wu |
Publisher | Springer |
Total Pages | 453 |
Release | 2015-06-23 |
Genre | Technology & Engineering |
ISBN | 3662470616 |
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.
Electrically Induced Vortical Flows
Title | Electrically Induced Vortical Flows PDF eBook |
Author | V. Bojarevi°s |
Publisher | Springer Science & Business Media |
Total Pages | 392 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 9400911637 |
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.
Conical Euler Analysis and Active Roll Suppression for Unsteady Vortical Flows about Rolling Delta Wings
Title | Conical Euler Analysis and Active Roll Suppression for Unsteady Vortical Flows about Rolling Delta Wings PDF eBook |
Author | Elizabeth M. Lee-Rausch |
Publisher | |
Total Pages | 36 |
Release | 1993 |
Genre | Airplanes |
ISBN |
Computations of Supersonic Vortical Flows Around Ogive-cylinders Using Central and Upwind Differences
Title | Computations of Supersonic Vortical Flows Around Ogive-cylinders Using Central and Upwind Differences PDF eBook |
Author | Eswar Josyula |
Publisher | |
Total Pages | 52 |
Release | 1997 |
Genre | Aerodynamics, Supersonic |
ISBN |
This work is part of a cooperative research, development, test and evaluation program that brings scientists and engineers from various English-speaking countries together for collaborative studies to improve technology to solve technical problems. The current TTCP work project WTP-2 KTA 2-12, 'Application of CFD to the prediction of Missile Body Vortices' focuses on the ability of the three-dimensional Navier-Stokes equations to predict flowfields about high length-to-diameter bodies at moderate angles of attack (8 deg
Electrically Induced Vortical Flows
Title | Electrically Induced Vortical Flows PDF eBook |
Author | V. Bojarevi°s |
Publisher | Springer Science & Business Media |
Total Pages | 408 |
Release | 1988-11-30 |
Genre | Science |
ISBN | 9789024737123 |
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.
Adaptive Navier-Stokes Calculations for Vortical Flow
Title | Adaptive Navier-Stokes Calculations for Vortical Flow PDF eBook |
Author | Earll M. Murman |
Publisher | |
Total Pages | 14 |
Release | 1993 |
Genre | Euler's numbers |
ISBN |
Separated and Vortical Flow in Aircraft Wing Aerodynamics
Title | Separated and Vortical Flow in Aircraft Wing Aerodynamics PDF eBook |
Author | Ernst Heinrich Hirschel |
Publisher | Springer Nature |
Total Pages | 458 |
Release | 2020-10-04 |
Genre | Technology & Engineering |
ISBN | 366261328X |
Fluid mechanical aspects of separated and vortical flow in aircraft wing aerodynamics are treated. The focus is on two wing classes: (1) large aspect-ratio wings and (2) small aspect-ratio delta-type wings. Aerodynamic design issues in general are not dealt with. Discrete numerical simulation methods play a progressively larger role in aircraft design and development. Accordingly, in the introduction to the book the different mathematical models are considered, which underlie the aerodynamic computation methods (panel methods, RANS and scale-resolving methods). Special methods are the Euler methods, which as rather inexpensive methods embrace compressibility effects and also permit to describe lifting-wing flow. The concept of the kinematically active and inactive vorticity content of shear layers gives insight into many flow phenomena, but also, with the second break of symmetry---the first one is due to the Kutta condition---an explanation of lifting-wing flow fields. The prerequisite is an extended definition of separation: “flow-off separation” at sharp trailing edges of class (1) wings and at sharp leading edges of class (2) wings. The vorticity-content concept, with a compatibility condition for flow-off separation at sharp edges, permits to understand the properties of the evolving trailing vortex layer and the resulting pair of trailing vortices of class (1) wings. The concept also shows that Euler methods at sharp delta or strake leading edges of class (2) wings can give reliable results. Three main topics are treated: 1) Basic Principles are considered first: boundary-layer flow, vortex theory, the vorticity content of shear layers, Euler solutions for lifting wings, the Kutta condition in reality and the topology of skin-friction and velocity fields. 2) Unit Problems treat isolated flow phenomena of the two wing classes. Capabilities of panel and Euler methods are investigated. One Unit Problem is the flow past the wing of the NASA Common Research Model. Other Unit Problems concern the lee-side vortex system appearing at the Vortex-Flow Experiment 1 and 2 sharp- and blunt-edged delta configurations, at a delta wing with partly round leading edges, and also at the Blunt Delta Wing at hypersonic speed. 3) Selected Flow Problems of the two wing classes. In short sections practical design problems are discussed. The treatment of flow past fuselages, although desirable, was not possible in the frame of this book.