Proceedings Visualization '98 (Cat. No.98CB36276)
DOI: 10.1109/visual.1998.745297
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Automatic detection of open and closed separation and attachment lines

Abstract: A fully automatic feature detection algorithm is presented that locates, and distinguishes, lines of flow separation and attachment on surfaces in 3-D numerical flow fields. The algorithm is based on concepts from 2-D phase plane analysis of linear vector fields. Unlike prior visualization techniques based on particle tracing or flow topology, the phase plane algorithm detects separation using local analytic tests. Results show that it not only detects the standard closed separation lines but also the illusive… Show more

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Cited by 55 publications
(36 citation statements)
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“…In addition to the definition and computation of vortex core lines (see [8] for a bibliography), several authors have attempted to detect and display separation and attachment lines on surfaces. The major contribution in this field was made by Kenwright [6] who proposed a method that looks for the presence of separation lines on a cell-wise basis. Upon the assumption of local linearity of the flow a section of separation line is extracted in each triangle as the intersection of specific lines present in the phase portrait of a first-order critical point with the interior of the cell.…”
Section: Related Workmentioning
confidence: 99%
“…In addition to the definition and computation of vortex core lines (see [8] for a bibliography), several authors have attempted to detect and display separation and attachment lines on surfaces. The major contribution in this field was made by Kenwright [6] who proposed a method that looks for the presence of separation lines on a cell-wise basis. Upon the assumption of local linearity of the flow a section of separation line is extracted in each triangle as the intersection of specific lines present in the phase portrait of a first-order critical point with the interior of the cell.…”
Section: Related Workmentioning
confidence: 99%
“…Before describing these elements, we briefly review the concepts of attachment and separation points by Kenwright [40]. Given a vector field V and a point p 0 in the plane, we consider the following values: e 1 Â u and e 2 Â u, where u is the vector value at p 0 , and e 1 and e 2 are the major and minor eigenvectors of the Jacobian.…”
Section: Attracting and Repelling Basis Vector Fieldsmentioning
confidence: 99%
“…The gradient tensor has found applications in a wide range of vector field visualization tasks such as fixed point classification and separatrix computation [12], attachment and separation line extraction [17], vortex core identification [29], [16], [25], [27], and periodic orbit detection [4]. However, the use of the gradient tensor in these applications is often limited to point-wise computation and analysis.…”
Section: Introductionmentioning
confidence: 99%