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Eurographics/ IEEE-VGTC Symposium on Visualization 2009 H.-C. Hege, I. Hotz, and T. Munzner

Summary: Eurographics/ IEEE-VGTC Symposium on Visualization 2009
H.-C. Hege, I. Hotz, and T. Munzner
(Guest Editors)
Volume 28 (2009), Number 3
Hierarchical Vortex Regions in Swirling Flow
Christoph Petz, Jens Kasten, Steffen Prohaska and Hans-Christian Hege
Zuse Institute Berlin (ZIB), Germany
We propose a new criterion to characterize hierarchical two-dimensional vortex regions induced by swirling mo-
tion. Central to the definition are closed loops that intersect the flow field at a constant angle. The union of loops
belonging to the same area of swirling motion defines a vortex region. These regions are disjunct but may be nested,
thus introducing a spatial hierarchy of vortex regions. We present a parameter free algorithm for the identification
of these regions. Since they are not restricted to star- or convex-shaped geometries, we are able to identify also in-
tricate regions, e.g., of elongated vortices. Computing an integrated value for each loop and mapping these values
to a vortex region, introduces new ways for visualizing or filtering the vortex regions. Exemplary, an application
based on the Rankine vortex model is presented. We apply our method to several CFD datasets and compare our
results to existing approaches.
Categories and Subject Descriptors (according to ACM CCS): Computer Graphics [I.3.8]: Applications--Physical
Sciences and Engineering [J.2]: Physics--
1. Introduction


Source: Andrzejak, Artur - Konrad-Zuse-Zentrum für Informationstechnik Berlin


Collections: Computer Technologies and Information Sciences