Hierarchical Vortex Regions in Swirling Flow
Christoph Petz, Jens Kasten, Steffen Prohaska, Hans-Christian Hege
In Computer Graphics Forum, 28(3), 2009.
Abstract: We propose a new criterion to characterize hierarchical two-dimensional vortex regions induced by swirling motion. 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 intricate 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.
Keyword(s): Computer Graphics [I.3.8]: Applications—Physical Sciences and Engineering [J.2]: Physics
Article URL: http://dx.doi.org/10.1111/j.1467-8659.2009.01463.x
BibTeX format:
@article{CGF:CGF1463,
  author = {Christoph Petz and Jens Kasten and Steffen Prohaska and Hans-Christian Hege},
  title = {Hierarchical Vortex Regions in Swirling Flow},
  journal = {Computer Graphics Forum},
  volume = {28},
  number = {3},
  pages = {863--870},
  year = {2009},
}
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