4:10 PM–6:22 PM, Sunday, November 23, 2008
- 004
Chair: John Dabiri, California Institute of Technology
Abstract ID: BAPS.2008.DFD.EW.1
4:10 PM–4:32 PM
George Haller
(MIT)
Lagrangian Coherent Structures (LCS) are distinguished material surfaces that organize the global mixing and transport of fluid particles. While these surfaces define a skeleton that governs all mixing events even in turbulent flows, LCS remain hidden to traditional coherent structure detecting methods based on vorticity, pressure, streamlines, or other frame-dependent quantities. Here we review the mathematical foundations of LCS and discuss how they can be located in an objective (frame-independent) way in complex flows. We also highlight applications to experimental and numerical flow data analysis. Examples include two-dimensional rotating turbulence, hairpin vortices in three-dimensional numerical simulations, passive ocean pollution control and atmospheric clear-air turbulence detection. Some of these examples will be discussed in more detail in later talks within this minisymposium.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.EW.1