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<p><b>Abstract</b>—The analysis and visualization of flows is a central problem in visualization. Topology-based methods have gained increasing interest in recent years. This article describes a method for the detection of closed streamlines in flows. It is based on a special treatment of cases where a streamline reenters a cell to prevent infinite cycling during streamline calculation. The algorithm checks for possible exits of a loop of crossed edges and detects structurally stable closed streamlines. These global features are not detected by conventional topology and feature detection algorithms.</p>
Vector field topology, limit cycles, closed streamlines.

T. Wischgoll and G. Scheuermann, "Detection and Visualization of Closed Streamlines in Planar Flows," in IEEE Transactions on Visualization & Computer Graphics, vol. 7, no. , pp. 165-172, 2001.
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