Abstract
A high-definition analysis based on flow topology is made on the vortex motions under natural and lock-on conditions in the near-wake region of a circular cylinder, where two-dimensional flow fields in the wake-transition regime are measured by a time-resolved PIV system. The Reynolds stress distributions are examined in view of the mean separation streamline and the trajectory ofthe vortex center. It is shown that, by the lock-on, the Reynolds stresses become stronger and their dispositions match well with the shortened wake bubble, indicating perfect synchronization of shedding to the oscillatory forcing flow in the near field, which causes increased lift and drag forces.
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Wontae Kim: He received his MSc (Eng.) in Civil Engineering in 2001 from Seoul National University. He is a graduate student working on his Ph. D. in the School of Mechanical & Aerospace Engineering, Seoul National University. His research interests are near-wake of a bluff body, time-resolved PIV, two-phase PIV and stereoscopic PIV
Jaeyong Sung: He received his MSc (Eng.) in Mechanical Engineering in 1996 from Seoul National University. He also received his Ph. D. in Mechanical Engineering in 2001 from Seoul National University. He worked for LG Electronics, Inc. in 2002. He is now working for School ofMechanical and Automotive Engineering, Sunchon National University, as a full-time lecturer since 2003. His research interests are time-resolved PIV, two-phase PIV, stereoscopic PIV and micro PIV
Jung Yul Yoo: He received his MSc (Eng.) in Mechanical Engineering in 1973 from University of Minnesota. He also received his Ph. D. in Mechanical Engineering in 1977 from University of Minnesota. He is now working for School of Mechanical & Aerospace Engineering, Seoul National University. His research interests are computational fluid dynamics, PIV: micro fluidics and bio fluids engineering.
Myeong Ho Lee: He received his MSc (Eng.) in Mechanical Engineering in 1986 from Kynng Hee University. He also received his Ph. D. in Mechanical Engineering in 1993 from Kynng Hee University. He is now working for Department ofMechanical Engineering, Seoul National University ofTechnology. His research interests are computational fluid dynamics and visualization offluid flow by PIV
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Kim, W., Sung, J., Yoo, J.Y. et al. High-definition PIV analysis on vortex shedding in the cylinder wake. J Vis 7, 17–24 (2004). https://doi.org/10.1007/BF03181481
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DOI: https://doi.org/10.1007/BF03181481