filename     : Fuc08.pdf
entry        : article
conference   : IEEE Transactions on Visualization and Computer Graphics
pages        : 615-626
year         : 2008
month        : 
title        : Parallel Vectors Criteria for Unsteady Flow Vortices
subtitle     :
author       : Raphael Fuchs, Ronald Peikert, Helwig Hauser, Filip Sadlo, Philipp Muigg
booktitle    : 
ISSN/ISBN    : 1077-2626
editor       : 
publisher    : IEEE Computer Society
publ.place   :
volume       :
issue        :
language     : English
keywords     : 
abstract     : Feature-based flow visualization is naturally dependent on feature extraction. To extract flow features, often higher-order properties of the flow data are used such as the Jacobian or curvature properties, implicitly describing the flow features in terms of their inherent flow characteristics (e.g., collinear flow and vorticity vectors). In this paper we present recent research which leads to the (not really surprising) conclusion that feature extraction algorithms need to be extended to a time-dependent analysis framework (in terms of time derivatives) when dealing with unsteady flow data. Accordingly, we present two extensions of the parallel vectors based vortex extraction criteria to the time-dependent domain and show the improvements of feature-based flow visualization in comparison to the steady versions of this extraction algorithm both in the context of a high-resolution dataset, i.e., a simulation specifically designed to evaluate our new approach, as well as for a real-world dataset from a concrete application.