|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Novel Ways of Describing Complex Fluid Flow: Curvature, Topology, and Stretching Fields
If you have a question about this talk, please contact Raymond E. Goldstein.
Fluid flows that are spatiotemporally chaotic but not turbulent are hard to characterize and understand. This lecture will present new ways of describing such flows, in part to characterize their ability to produce mixing and transport. (a) Complex flows can be characterized by their special topological points. These special points can be detected and followed in real time by measuring the curvature of particle trajectories, and to use this information to study the transition to spatiotemporal chaos. The special points are found to be pinned to the forcing when the driving is weak, but wander over the flow and interact in pairs when the flow is stronger. Their behavior reveals a two-stage transition to spatiotemporal chaos: a gradual loss of spatial and temporal order followed by an abrupt onset of topological changes. Another powerful way to describe complex flows is to determine their “stretching fields” (spatially resolved finite time Lyapunov exponent fields), which are very useful in describing mixing and reactions in fluid flows.
This talk is part of the Fluid Mechanics (DAMTP) series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsAll CMS Events Cavendish Graduate Student Conference 2010 Cambridge Centre for Analysis talks
Other talksEnforcement: The Conundrum at the Heart of Animal Welfare Policy The epidemiologist as culture hero: visualising humanity in the age of 'the next pandemic' Running Out of Energy? The Future of the UK’s Electricity Supply. First results from the LBTI Energetics of vertical dispersion in simple and double-diffusive turbulent stratified fluids Towards understanding the role of HLA-DRB1 in human susceptibility to Leishmania donovani infection