Numerical Studies In Two Dimensional Turbulence

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Numerical Studies In Two Dimensional Turbulence

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Author : Fayeza Salim Sulti
language : en
Publisher:
Release Date : 2012

Numerical Studies In Two Dimensional Turbulence written by Fayeza Salim Sulti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

Two-dimensional turbulence has been extensively studied over the past years theoretically and numerically since the theory of the dual cascade energy. Numerical studies have revealed an impor- tant feature of two-dimensional turbulence, that is, the predomi- nance of coherent structures, followed by interaction and merger of these isolated vortices in the subsequent evolution. A method of 'vortex census' has been introduced to keep track of the vortices but the relation to reconnection has remained unexplored. In this Thesis, we study the reconnection process of vorticity con- tours associated with coherent vortices in two-dimensional turbu- lence for different Reynolds number. After checking topological integrity by the Euler index theorem, we make use of the critical points and their connectivity (so-called surface networks) to study the topological changes of vorticity contours. Wc show how this method can remarkably distinguish the dynamics of the vortic- ity field in the Navier-Stokes equations and that of the Charney- Hasegawa-Mima equation. We found that the potential vorticity formed vortex crystals. This excites us to study the vortex crystal in details by study a coarse-grained asymptotic equation [Smirnov and Chukbar(2001)]. Self-similar blow-up solutions with an infi- 1 I i :. nite total energy were given. We ask whether or not finite-time blow-up can take place developing from smooth initial data with a finite energy.

Numerical Studies In Two Dimensional Turbulence

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Author : Fayeza Salim Al Sulti
language : en
Publisher:
Release Date : 2013

Numerical Studies In Two Dimensional Turbulence written by Fayeza Salim Al Sulti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Numerical Studies Of Dispersion Processes In Two Dimensional Homogeneous Decaying Turbulence

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Author : Anthony Daniel Kowalski
language : en
Publisher:
Release Date : 1980

Numerical Studies Of Dispersion Processes In Two Dimensional Homogeneous Decaying Turbulence written by Anthony Daniel Kowalski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Dispersion categories.

Numerical Studies Of Laminar And Turbulent Drag Reduction

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-13

Numerical Studies Of Laminar And Turbulent Drag Reduction written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-13 with categories.

Two-dimensional incompressible flow over wavy surfaces is studied numerically by spectral methods. Turbulence effects are modeled. Results for symmetric and asymmetric wave forms are presented. Effect of propagating surface waves on drag reduction is studied. Comparisons between computer simulations and experimental results are made. Balasubramanian, R. and Orszag, S. A. Unspecified Center NASA-CR-3498, CHI-57 NAS1-16237...

Numerical Studies Of Transition From Laminar To Turbulent Flow Over A Flat Plate

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Author : D. F. De Santo
language : en
Publisher:
Release Date : 1961

Numerical Studies Of Transition From Laminar To Turbulent Flow Over A Flat Plate written by D. F. De Santo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Laminar flow categories.

A finite-difference technique is developed for analyzing the time-dependent two-dimensional flow of an incompressible viscous fluid over a semi-infinite flat plate. The complete (nonlinear) equations of motion for perturbed Blasius flow are numerically integrated with respect to time, and the propagation of disturbances in the boundary layer is determined. An analysis of the theoretical convergence and stability properties of the difference scheme is carried out. The method developed has been employed in two test calculations, in which slightly unstable oscillatory disturbances have been introduced at some upstream point. The numerical solutions exhibit many of the major theoretical and experimentally observed features associated with transition from laminar to turbulent boundary-layer flow. (Author).

Studying Turbulence Using Numerical Simulation Databases Ii

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Author : Center for Turbulence Research (U.S.)
language : en
Publisher:
Release Date : 1988

Studying Turbulence Using Numerical Simulation Databases Ii written by Center for Turbulence Research (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Turbulence categories.

Advances In Turbulence Studies

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Author : Yeshajahu Unger
language : en
Publisher: AIAA
Release Date : 1993

Advances In Turbulence Studies written by Yeshajahu Unger and has been published by AIAA this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Turbulence categories.

Numerical Studies Of Transitiion From Laminar To Turbulent Flow Over A Flat Plate

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Author : D. F. De Santo
language : en
Publisher:
Release Date : 1961

Numerical Studies Of Transitiion From Laminar To Turbulent Flow Over A Flat Plate written by D. F. De Santo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Difference equations categories.

A finite-difference technique is developed for analyzing the time-dependent two-dimensional flow of an incompressible viscous fluid over a semi-infinite flat plate. The complete (nonlinear) equations of motion for perturbed Blasius flow are numerically integrated with respect to time, and the propagation of disturbances in the boundary layer is determined. An analysis of the theoretical convergence and stability properties of the difference scheme is carried out. The method developed has been employed in two test calculations, in which slightly unstable oscillatory disturbances have been introduced at some upstream point. The numerical solutions exhibit many of the major theoretical and experimentally observed features associated with transition from laminar to turbulent boundary-layer flow.

Turbulence In Fluids

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Author : Marcel Lesieur
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Turbulence In Fluids written by Marcel Lesieur and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.

Turbulence is a dangerous topic which is often at the origin of serious fights in the scientific meetings devoted to it since it represents extremely different points of view, all of which have in common their complexity, as well as an inability to solve the problem. It is even difficult to agree on what exactly is the problem to be solved. Extremely schematically, two opposing points of view have been advocated during these last ten years: the first one is "statistical", and tries to model the evolution of averaged quantities of the flow. This com has followed the glorious trail of Taylor and Kolmogorov, munity, which believes in the phenomenology of cascades, and strongly disputes the possibility of any coherence or order associated to turbulence. On the other bank of the river stands the "coherence among chaos" community, which considers turbulence from a purely deterministic po int of view, by studying either the behaviour of dynamical systems, or the stability of flows in various situations. To this community are also associated the experimentalists who seek to identify coherent structures in shear flows.

Research Directions In Computational Mechanics

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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1991-02-01

Research Directions In Computational Mechanics written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-02-01 with Technology & Engineering categories.

Computational mechanics is a scientific discipline that marries physics, computers, and mathematics to emulate natural physical phenomena. It is a technology that allows scientists to study and predict the performance of various productsâ€"important for research and development in the industrialized world. This book describes current trends and future research directions in computational mechanics in areas where gaps exist in current knowledge and where major advances are crucial to continued technological developments in the United States.