New Lagrangian diagnostics for characterizing fluid flow mixing

Ruty Mundel, Erick Fredj, Hezi Gildor, Vered Rom-Kedar

Research output: Contribution to journalArticlepeer-review

Abstract

A new kind of Lagrangian diagnostic family is proposed and a specific form of it is suggested for characterizing mixing: the extreme (maximal/minimal) extent of a trajectory and some of its variants. It enables the detection of coherent structures and their dynamics in two- (and potentially three-) dimensional unsteady flows in both bounded and open domains. Its computation is simple and provides new insights regarding the mixing properties on both short and long time scales and on both spatial plots and distribution diagrams. We demonstrate its applicability to two dimensional flows using two toy models and a data set of surface currents from the South Atlantic.

Original languageAmerican English
Article number1.4903239
JournalPhysics of Fluids
Volume26
Issue number12
DOIs
StatePublished - 15 Dec 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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