Feature extraction of separation and attachment lines

被引:51
作者
Kenwright, DN [1 ]
Henze, C [1 ]
Levit, C [1 ]
机构
[1] NASA, Ames Res Ctr, MRJ Technol Solut Inc, Moffett Field, CA 94035 USA
关键词
vector field visualization; vector field topology; flow visualization; feature detection; flow separation; separation line;
D O I
10.1109/2945.773805
中图分类号
TP31 [计算机软件];
学科分类号
081202 ; 0835 ;
摘要
Separation and attachment lines are topologically significant curves that exist on 2D surfaces in 3D vector fields. Two algorithms are presented, one point-based and one element-based, that extract separation and attachment lines using eigenvalue analysis of a locally linear function. Unlike prior techniques based on piecewise numerical integration, these algorithms use robust analytical tests that can be applied independently to any point in a vector field. The feature extraction is fully automatic and suited to the analysis of large-scale numerical simulations. The strengths and weaknesses of the two algorithms are evaluated using analytic vector fields and also results from computational fluid dynamics (CFD) simulations. We show that both algorithms detect open separation lines-a type of separation that is not captured by conventional vector field topology algorithms.
引用
收藏
页码:135 / 144
页数:10
相关论文
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