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Flow Topology and Tomography for Vortex Identification in Unsteady and in Three-Dimensional Flows

Dallmann, U.Ch. and Vollmers, H. and Su, W. and Zhang, H. (1999) Flow Topology and Tomography for Vortex Identification in Unsteady and in Three-Dimensional Flows. In: IUTAM Symposium - Simulation and Identification of Organized Structures in Flows, pp. 223-238. Kluwer. IUTAM Symposium - Simulation and Identification of Organized Structures in Flows -,Lyngby/Denmark, 25.-29. Mai 1997.

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Abstract

The characterization of organized structures is discussed with emphasis on changes of the flows topologies. The changes may be monitored in physical space. However, structural changes also appear in the space of invariants of various vector-gradient tensor. Vortices are only one part of a flow structure to be identified herewith. Jacobian invariants of vector-field mappings onto physical space provide a topological characterization of flow structures and their changes in physical and in the vector-field spaces. Several problems of structure identification are high-lighted with respect to instantaneous flow fields and within cross-sectional flow patterns of iso-surfaces of any scalars or components of vectors. On the other hand, the topological structures of flows (defined by any physical vector quantity of interest) are well-defined by singular flow surfaces in physical space. However, their geometric complexity in three-dimensional and/or unsteady flows suggests to monitor especially their local genesis occuring at higher-order degeneracies in physical space and/or singularities in spaces of components and/or invariants of vector-fields. Flow tomography is suggested to provide a means for flow analyses in physical space

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Flow Topology and Tomography for Vortex Identification in Unsteady and in Three-Dimensional Flows
Authors:
AuthorsInstitution or Email of Authors
Dallmann, U.Ch.UNSPECIFIED
Vollmers, H.UNSPECIFIED
Su, W.Fluid Mech. Inst. Beijing/China
Zhang, H.Dept. of Mech. Tianjin University/China
Date:1999
Journal or Publication Title:IUTAM Symposium - Simulation and Identification of Organized Structures in Flows
Page Range:pp. 223-238
Editors:
EditorsEmail
Sorensen, J.N.UNSPECIFIED
Hopfinger, E.J.UNSPECIFIED
Aubry, M.UNSPECIFIED
Publisher:Kluwer
Status:Published
Keywords:Flow Topology, Flow Tomography, Vortex Identification
Event Title:IUTAM Symposium - Simulation and Identification of Organized Structures in Flows -,Lyngby/Denmark, 25.-29. Mai 1997
Organizer:IUTAM
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TG - Querschnittstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:29

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