Affiliations: Division of Mechanical and Information Engineering,
Korea Maritime University, Youngdo-ku, Dongsam-dong, Busan 606-791,
Korea. | Institute of Industrial Science, The University of
Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
Abstract: A new 3D-PTV technique has been developed using GA (Genetic
Algorithm). The measurement system consists of three CCD cameras, Ar-ion laser,
an image grabber and a host computer. One-to-one correspondences are made by
taking advantage of the combinatorial optimization of the genetic algorithm for
the whole particles of the two images during the time interval of image frames.
Two fitness functions are introduced in order to enhance the correspondences of
the particles. One is based on the concept of continuum theory and the other
one is based on the minimum error of three-dimensional distance. Performance of
the developed algorithm is tested using a set of virtual images constructed by
the use of LES data set on an impinging jet. The developed 3D-PTV system is
successfully applied to the measurement of flow characteristics of the wake of
a circular cylinder.
