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Author: Tanvir Akbar Publisher: ISBN: Category : Languages : en Pages : 116
Book Description
The thesis sheds light on the onset of three-dimensionality in the wake of infinite cylindrical bodies. The first part of thesis consists in an investigation of the wake of a straight infinite circular cylinder by 3D simulations. It shows that the subcriticality of the bifurcation giving rise to the onset of three-dimensionality triggers very strong non-linear effects limiting considerably the relevance of the linear theory. The flow dynamics is shown to be chaotic and to contain very large spanwise scale that must be taken into account to reproduce reliably experimental observations. The obtained numerical results set the subcritical bi-stability interval down to the Reynolds number of 170 and show that the well-known modes A and B co-exist in all regimes since the very onset of the three-dimensionality. The method of investigation of the cylinder wake is further applied to a NACA0012 airfoil with variable angle of incidence. The onset of three-dimensionality is investigated for angles of incidence from 8 to 12 degrees. The corresponding bifurcation is supercritical. The obtained spanwise scales might be of use in designing efficient direct numerical simulations.
Author: Tanvir Akbar Publisher: ISBN: Category : Languages : en Pages : 116
Book Description
The thesis sheds light on the onset of three-dimensionality in the wake of infinite cylindrical bodies. The first part of thesis consists in an investigation of the wake of a straight infinite circular cylinder by 3D simulations. It shows that the subcriticality of the bifurcation giving rise to the onset of three-dimensionality triggers very strong non-linear effects limiting considerably the relevance of the linear theory. The flow dynamics is shown to be chaotic and to contain very large spanwise scale that must be taken into account to reproduce reliably experimental observations. The obtained numerical results set the subcritical bi-stability interval down to the Reynolds number of 170 and show that the well-known modes A and B co-exist in all regimes since the very onset of the three-dimensionality. The method of investigation of the cylinder wake is further applied to a NACA0012 airfoil with variable angle of incidence. The onset of three-dimensionality is investigated for angles of incidence from 8 to 12 degrees. The corresponding bifurcation is supercritical. The obtained spanwise scales might be of use in designing efficient direct numerical simulations.
Author: W. Kordulla Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
The present paper reports on the numerical simulation of the transonic laminar flow past a hemisphere cylinder at an angle of incidence of 0 and 19 deg. In both cases the computations suggest unsteady flow behavior which requires further investigations, in particular because other applications by similar methods in two and three dimensions do allow to simulate symmetric transonic and steady supersonic flows. One instantaneous flow result for the 19 deg case is used as an example to analyze the topology of a flow with separation. The analysis shows that the numerical simulation yields results consistent with possible topological structures, and can be used further to investigate steady state flows with separation.
Author: Ernst Heinrich Hirschel Publisher: Springer Science & Business Media ISBN: 3642413781 Category : Technology & Engineering Languages : en Pages : 396
Book Description
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.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 652
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: V.Z. Parton Publisher: Routledge ISBN: 1351412930 Category : Technology & Engineering Languages : en Pages : 209
Book Description
Recent government and commercial efforts to develop orbital and suborbital passenger and transport aircraft have resulted in a burgeoning of new research. The articles in this book, translated from Russian, were contributed by the world's leading authorities on supersonic and hypersonic flows and heat transfer. This superb book addresses the physics and engineering aspects of ultra high-speed aerodynamic problems. Thorough coverage is given to an array of specific problem-solving equations. Super- and Hypersonic Aerodynamics and Heat Transfer will be essential reading for all aeronautical engineers, mechanical engineers, mathematicians, and physicists involved in this exciting field of research.
Author: Tanvir Akbar
Author: Tanvir Akbar
Author: Medhat Aly El-Nahas
Author: George S. Diewert
Author: W. Kordulla
Author: Ernst Heinrich Hirschel
Author: Institute for Computer Applications in Science and Engineering
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Author: V.Z. Parton
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