Internal Waves Generated By A Vortex Pair
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Author | : |
Publisher | : |
Total Pages | : 34 |
Release | : 1999 |
Genre | : |
ISBN | : |
Both observations and direct numerical simulations have shown that convecting storms create significant internal gravity wave activity. However, the physical mechanism for gravity wave generation is not clear. In this work, numerical simulations of a simple vortex model of convection have been performed for three different cases: a constant density case; a constant Brunt-Vasala frequency case: and a case with two layers, each with its own Brunt-Vasala frequency.
Author | : Laura Katherine Brandt |
Publisher | : |
Total Pages | : 180 |
Release | : 2009 |
Genre | : |
ISBN | : |
This work investigates fundamental two-dimensional vortex pair dynamics in unstratified and stably stratified environments through numerical and analytical techniques. The study focuses on two main topics: (i) vortex interaction and merging of co-rotating vortex pairs and (ii) internal wave generation by co-rotating and counter-rotating vortex pairs. Two-dimensional vortex merging in a viscous fluid is studied using numerical simulations. Analysis of the ideal case of two equal co-rotating vortices (symmetric pair) identifies the basic underlying physics of vortex merger. Through the interaction of the vorticity gradient and the mutually induced strain rate near the central hyperbolic point, a tilt in vorticity contours is established. This leads to core detrainment and the entrainment of core fluid into the exchange band, which transforms the flow into a single vortex. In the case of the asymmetric (unequal strength) vortex pair, the disparity in the deformation rates between the vortices alters the interaction. A critical value for a strain rate parameter characterizing the establishment of core detrainment is determined. The onset of merging is associated with the achievement of the critical strain by both vortices and a generalized merging criterion is formulated. A classification scheme of the various viscous vortex interactions is developed. Results for the symmetric, horizontally oriented vortex pair in a weakly stratified fluid provide further insight on vortex merging. The effects of weak stratification depend on the ratio of the diffusive time scale to the turnover time, i.e., the Reynolds number. A crossover Reynolds number is found, above which convective merging is accelerated with respect to unstratified flow and below which it is delayed. The generation of internal waves by {\it horizontally} orientated co-rotating and counter-rotating vortex pairs is studied. Linearized inviscid equations are derived that describe the internal wave, vorticity and energy fields. These solutions are compared with nonlinear numerical viscous simulations in moderately and strongly stratified environments. Through evaluation of the energy field, the time at which the flow reaches a steady state for strongly stratified flows is found, along with a characterization of the regimes of strongly and moderately stratified environments.
Author | : Kolumban Hutter |
Publisher | : Springer Science & Business Media |
Total Pages | : 292 |
Release | : 2011-11-25 |
Genre | : Science |
ISBN | : 3642234380 |
Internal wave dynamics in lakes (and oceans) is an important physical component of geophysical fluid mechanics of ‘quiescent’ water bodies of the Globe. The formation of internal waves requires seasonal stratification of the water bodies and generation by (primarily) wind forces. Because they propagate in basins of variable depth, a generated wave field often experiences transformation from large basin-wide scales to smaller scales. As long as this fission is hydrodynamically stable, nothing dramatic will happen. However, if vertical density gradients and shearing of the horizontal currents in the metalimnion combine to a Richardson number sufficiently small (
Author | : Defence Research Establishment Pacific |
Publisher | : |
Total Pages | : 35 |
Release | : 1972 |
Genre | : |
ISBN | : |
Author | : Sir M. J. Lighthill |
Publisher | : Cambridge University Press |
Total Pages | : 528 |
Release | : 2001-11-15 |
Genre | : Mathematics |
ISBN | : 9780521010450 |
A comprehensive textbook in which the author describes the science of waves in liquids and gases. Drawing on a subject of enormous extent and variety, he provides his readers with a thorough analysis of the most important and representative types of waves including sound waves, shock waves, waterwaves of all kinds, and the so-called internal waves (inside atmospheres and oceans) due to intensity stratification. Emphasis throughout is on the most generally useful fundamental ideas of wave science, including the principles of how waves interact with flows. This standard work on one of the great subdivisions of the dynamics of fluids is lucidly written and will be invaluable to engineers, physicists, geophysicists, applied mathematicians or any research worker concerned with wave motions or fluid fllows. It is especially suitable as a textbook for courses at the final year undergraduate or graduate level.
Author | : Jan-Bert Flor |
Publisher | : Springer |
Total Pages | : 199 |
Release | : 2010-06-01 |
Genre | : Science |
ISBN | : 364211587X |
Most well known structures in planetary atmospheres and the Earth’s oceans are jets or fronts interacting with vortices on a wide range of scales. The transition from one state to another, such as in unbalanced or adjustment flows, involves the generation of waves as well as the interaction of coherent structures with these waves. This book presents a fluid mechanics perspective to the dynamics of fronts and vortices and their interaction with waves in geophysical flows. It provides a basic physical background for modeling coherent structures in a geophysical context, and it gives essential information on advanced topics such as spontaneous wave emission and wavemomentum transfer in geophysical flows. Based on a set of lectures by leading specialists, this text is targeted at graduate students, researchers and engineers in geophysics and environmental fluid mechanics.
Author | : Oliver Bühler |
Publisher | : Cambridge University Press |
Total Pages | : 377 |
Release | : 2014-03-06 |
Genre | : Mathematics |
ISBN | : 1107669669 |
A fundamental reference for graduate students and researchers in fluid mechanics. Now revised throughout, it also includes exercises.
Author | : Xuebo Zhang |
Publisher | : Frontiers Media SA |
Total Pages | : 281 |
Release | : 2023-07-04 |
Genre | : Science |
ISBN | : 2832528740 |
Author | : George Thomas KAYE |
Publisher | : |
Total Pages | : 312 |
Release | : 1974 |
Genre | : Internal waves |
ISBN | : |
Author | : Michael C. Gregg |
Publisher | : Cambridge University Press |
Total Pages | : 385 |
Release | : 2021-02-04 |
Genre | : Science |
ISBN | : 1316800415 |
The stratified ocean mixes episodically in small patches where energy is dissipated and density smoothed over scales of centimeters. The net effect of these countless events effects the shape of the ocean's thermocline, how heat is transported from the sea surface to the interior, and how dense bottom water is lifted into the global overturning circulation. This book explores the primary factors affecting mixing, beginning with the thermodynamics of seawater, how they vary in the ocean and how they depend on the physical properties of seawater. Turbulence and double diffusion are then discussed, which determines how mixing evolves and the different impacts it has on velocity, temperature, and salinity. It reviews insights from both laboratory studies and numerical modelling, emphasising the assumptions and limitations of these methods. This is an excellent reference for researchers and graduate students working to advance our understanding of mixing, including oceanographers, atmospheric scientists and limnologists.