Meacham
Stephen P.
Meacham
Stephen P.
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Technical Report1991 Summer Study Program in Geophysical Fluid Dynamics : patterns in fluid flow(Woods Hole Oceanographic Institution, 1991-09) Young, Bill ; Fauve, Stephan ; DeRemer, Barbara Ewing ; Meacham, Stephen P.The GFD program in 1991 focused on pattern forming processes in physics and geophysics. The pricipallecturer, Stephan Fauve, discussed a variety of systems, including our old favorite, Rayleigh-Bénard convection, but passing on to exotic examples such as vertically vibrated granular layers. Fauve's lectures emphasize a unified theoretical viewpoint based on symmetry arguments. Patterns produced by instabilties can be described by amplitude equations, whose form can be deduced by symmetry arguments, rather than the asymptotic expansions that have been the staple of past Summer GFD Programs. The amplitude equations are far simpler than the complete equations of motion, and symetry arguments are easier than asymptotic expansions. Symmetry arguments also explain why diverse systems are often described by the same amplitude equation. Even for granular layers, where there is not a universaly accepted continuum description, the appropnate amplitude equation can often be found using symmetry arguments and then compared with experiment. Our second speaker, Daniel Rothan, surveyed the state of the art in lattice gas computations. His lectures illustrate the great utility of these methods in simulating the flow of complex multiphase fluids, particularly at low Reynolds numbers. The lattice gas simulations reveal a complicated phenomenology much of which awaits analytic exploration. The fellowship lectures cover broad ground and reflect the interests of the staff members associated with the program. They range from the formation of sand dunes, though the theory of lattice gases, and on to two dimensional-turbulence and convection on planetary scales. Readers desiring to quote from these report should seek the permission of the authors (a partial list of electronic mail addresses is included on page v). As in previous years, these reports are extensively reworked for publication or appear as chapters in doctoral theses. The task of assembling the volume in 1991 was at first faciltated by our newly acquired computers, only to be complicated by hurricane Bob which severed electric power to Walsh Cottage in the final hectic days of the Summer.
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Technical ReportDouble-diffusive processes : 1996 Summer Study Program in Geophysical Fluid Dynamics(Woods Hole Oceanographic Institution, 1997-07) Meacham, Stephen P. ; Tucholke, DaciaThe physics of double diffusion and the role that it plays in the ocean provided the central theme for the 1996 summer program in Geophysical Fluid Dynamics at the Woods Hole Oceanographic Institution. Lectures and seminars given by staff and visitors surveyed observations, laboratory experiments and theoretical models of double diffusive phenomena. Several lectures dealt with the related phenomena of thermal convection in layered media, the dynamics of binary fluids, viscoelastic convection and magnetoconvection. Research projects by the fellows included experiments with double diffusion in a slot, work on the formation and evolution of staircases, double diffusion in stars and the interaction between convection and radiation. This volume includes write-ups of the principal lectures, report of the fellows' research projects and abstracts of some of the seminars. A list of presentations and a bibliography may be found at the back of the volume.