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Published in:
2015 | OriginalPaper | Chapter
Objective Detection of Lagrangian Vortices in Unsteady Velocity Data
Author : George Haller
Published in: Dynamic Data-Driven Environmental Systems Science
Publisher: Springer International Publishing
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Abstract
Lagrangian Coherent Structures (LCSs) are special material surfaces that delineate tracer patterns in unsteady flows. The recently developed variational theory of LCSs enables their objective (frame-invariant) detection in numerical and experimental velocity data. Here we review the main results of this variational theory for elliptic LCSs (i.e., perfectly coherent material vortices) and show how such structures can be extracted from geophysical data sets.