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Erschienen in:
2011 | OriginalPaper | Buchkapitel
On the Extraction of Long-living Features in Unsteady Fluid Flows
verfasst von : Jens Kasten, Ingrid Hotz, Bernd R. Noack, Hans-Christian Hege
Erschienen in: Topological Methods in Data Analysis and Visualization
Verlag: Springer Berlin Heidelberg
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This paper proposes aGalilean invariant generalization of critical points ofvector field topology for 2
D
time-dependent flows. The approach is based upon a Lagrangian consideration of fluid particle motion. It extracts long-living features, likesaddles and centers, and filters out short-living local structures. This is well suited for analysis ofturbulent flow, where standard snapshot topology yields an unmanageable large number of topological structures that are barely related to the few main long-living features employed in conceptual fluid mechanics models. Results are shown for periodic and chaoticvortex motion.