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Flow Analysis II

Feature-Based Analysis and Comparison of Coherent Structures in Parameter-Dependent Flows

Description

In this projects methods are developed for extraction of coherent structures or dominant features in complex turbulent, time-dependent flows. Since flow fields are inherently noisy, robust methods are needed. A special focus is put on parameter-dependent fields. These parameters can be flow parameters such as actuation, or model parameters like the shape of the boundaries that influence the flow. New feature based methods for comparing flow fields shall also be developed. For this measures to compare the different structures are investigated. Those techniques will be integrated into a virtual lab. 

Members

Responsible

Partners

Funding

DFG SFB 557 (07/2007 – 06/2010; last Phase)
ZIB (07/2010 – 05/2012)

Duration

07/2007 – 05/2012

  • J. Kasten, A. Zoufahl, H.-C. Hege, and I. Hotz. Analysis of vortex merge graphs. VMV 2012: Vision, Modeling and Visualization, Magdeburg, Germany, pp. 111-118.
  • J.Kasten, I.Hotz, B.R. Noack, H.-C. Hege. Vortex merge graphs in two-dimensional unsteady flow fields. Proceedings Joint IEEE/EG Conference on Visualization -- EuroVis 2012, Short Paper Proceedings, pp. 1-5, Eurographics Association.
  • H.-C. Hege, J. Kasten, I. Hotz. Distillation and Visualization of Spatiotemporal Structures in Turbulent Flow Fields. J. Phys.: Conf. Ser., Vol. 318, pp. 062009, 2011.
  • J. Kasten, J. Reininghaus, I. Hotz, H.-C. Hege. Two-Dimensional Time-Dependent Vortex Regions Based on the Acceleration Magnitude. IEEE Transactions on Visualization and Computer Graphics, Vol. 17, No. 12, pp. 2080-2087, 2011.
  • J. Kasten, I. Hotz, H.-C. Hege. On the Elusive Concept of Lagrangian Coherent Structures. Topological Methods in Data Analysis and Visualization II, Mathematics and Visualization Ronny Peikert, Helwig Hauser, Hamish Carr (Ed.), pp. 207 - 220, Springer, Berlin, 2011.
  • J. Kasten, J. Reininghaus, K. Oberleithner, I. Hotz, B. R. Noack, H.-C. Hege. Flow over a Cavity -- Evolution of the Vortex Skeleton. Visualization at 28th Annual Gallery of Fluid Motion exhibit, held at the 63th Annual Meeting of the American Physical Society, Division of Fluid Dynamics (Long Beach, CA, USA, November 21-23, 2010)., 2010.
  • J. Kasten, C. Petz, I. Hotz, G. Tadmor, B. R. Noack, H.-C. Hege. Lagrangian Feature Extraction of the Cyliner Wake. Physics of Fluids, Vol. 22, 9, Gallery of Fluid Motion Award 2009, 2010.
  • J. Kasten, T. Weinkauf, C. Petz, I. Hotz, B. R. Noack, H.-C. Hege. Extraction of Coherent Structures from Natural and Actuated Flows. Active Flow Control II, 108:373-387, 2010.
  • J. Kasten, I. Hotz, B. Noack, H.-C. Hege. On the Extraction of Long-living Features in Unsteady Fluid Flows. V. Pascucci et al. (ed.), pp. 115-126, Springer, Berlin, 2010.
  • J. Kasten, C. Petz, I. Hotz, B. R. Noack, H.-C. Hege. Localized Finite-time Lyapunov Exponent for Unsteady Flow Analysis. In: Marcus Magnor, Bodo Rosenhahn and Holger Theisel, editors, Vision, Modeling and Visualization, vol. 1, pp. 265-274. Universität Magdeburg, Institut für Simulation und Graphik, 2009.
  • T. Weinkauf, D. Guenther. Separatrix Persistence: Extraction of Salient Edges on Surfaces Using Topological Methods. Computer Graphics Forum, 28(5):1519–1528, 2009.
  • K. Shi, H. Theisel, H. Hauser, T. Weinkauf, K. Matkovic, H.-C. Hege, H.-P. Seidel. Path Line Attributes - an Information Visualization Approach to Analyzing the Dynamic Behavior of 3D Time-Dependent Flow Fields. Topology-Based Methods in Visualization II, p. 75–88, 2009.
  • W. von Funck, T. Weinkauf, H. Theisel, H.-P. Seidel. Smoke Surfaces: An Interactive Flow Visualization Technique Inspired by Real-World Flow Experiments. IEEE Transactions on Visualization and Computer Graphics, 14(6):1396–1403, 2008.
  • K. Shi, H. Theisel, T. Weinkauf, H.-C. Hege, H.-P. Seidel. Visualizing Transport Structures of Time-Dependent Flow Fields. IEEE Computer Graphics and Applications, 28(5):24 – 36, 2008.
  • T. Weinkauf. Extraction of Topological Structures in 2D and 3D Vector Fields, PhD Thesis. 2008.
  • K. Shi, H. Theisel, T. Weinkauf, H.-C. Hege, H.-P. Seidel. Finite-Time Transport Structures of Flow Fields. Proc. IEEE Pacific Visualization 2008, p. 63–70, Kyoto, Japan, 2008.
  • T. Weinkauf, J. Sahner, B. Gunther, H. Theisel, H.-C. Hege, F. Thiele. Feature-based Analysis of a Multi-Parameter Flow Simulation. Proc. SimVis 2008, p. 237–252, Magdeburg, Germany, 2008.
  • R. S. Laramee, G. Erlebacher, C. Garth, T. Schafhitzel, H. Theisel, X. Tricoche, T. Weinkauf, D. Weiskopf. Applications of Texture-Based Flow Visualization. Engineering Applications of Computational Fluid Mechanics (EACFM), 2(3):264–274, 2008.
  • H. Theisel, C. Rossl, T. Weinkauf. Morphological Representations of Vector Fields. Shape Analysis and Structuring, p. 215–240, 2008.
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