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Cores of Swirling Particle Motion in Unsteady Flows Tino Weinkauf, Jan Sahner, Holger Theisel, and Hans-Christian Hege, Member, IEEE
 

Summary: Cores of Swirling Particle Motion in Unsteady Flows
Tino Weinkauf, Jan Sahner, Holger Theisel, and Hans-Christian Hege, Member, IEEE
Abstract--In nature and in flow experiments particles form patterns of swirling motion in certain locations. Existing approaches
identify these structures by considering the behavior of stream lines. However, in unsteady flows particle motion is described by
path lines which generally gives different swirling patterns than stream lines. We introduce a novel mathematical characterization of
swirling motion cores in unsteady flows by generalizing the approach of Sujudi/Haimes to path lines. The cores of swirling particle
motion are lines sweeping over time, i.e., surfaces in the space-time domain. They occur at locations where three derived 4D vectors
become coplanar. To extract them, we show how to re-formulate the problem using the Parallel Vectors operator. We apply our
method to a number of unsteady flow fields.
Index Terms--unsteady flow visualization, feature extraction, particle motion.
!
1 INTRODUCTION
Flow fields play a vital role in many areas. Examples are burning
chambers, turbomachinery and aircraft design in industry as well as
blood flow in medicine. As the resolution of numerical simulations
and experimental measurements like PIV have evolved significantly in
the last years, the challenge of understanding the intricate flow struc-
tures within massive result data sets has made automatic feature ex-
traction necessary.
Among the features of interest, vortices are the most prominent:

  

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

 

Collections: Computer Technologies and Information Sciences