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http://dx.doi.org/10.3744/SNAK.2012.49.3.213

Laminar Flow Structures Near a Circular Cylinder in between a Free-Surface and a Moving Wall  

Seo, Jang-Hoon (Samsung Heavy Industry Co. Ltd.)
Jung, Jae-Hwan (Department of Naval Architecture and Ocean Engineering, Pusan University)
Yoon, Hyun-Sik (Global Core Research Center for Ships and Offshore Plants, Pusan University)
Park, Dong-Woo (Hyundai Heavy Industries Co. Ltd.)
Chun, Ho-Hwan (Department of Naval Architecture and Ocean Engineering, Pusan University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.49, no.3, 2012 , pp. 213-221 More about this Journal
Abstract
The present study numerically investigates the interaction between a free-surface and flow around a circular cylinder over a moving wall. In order to simulate the flow past the circular cylinder over a moving wall near a free-surface, this study has adopted the direct-forcing/fictitious domain (DF/FD) method with the level set method in the Cartesian coordinates. Numerical simulation is performed for a Reynolds numbers of 100 in the range of $0.25{\leq}g/D{\leq}2.00$ and $0.5{\leq}h/D{\leq}2.00$, where g/D and h/D are the gaps between the cylinder and a moving wall and the cylinder and a free-surface normalized by cylinder diameter D, respectively. According to g/D and h/D, the vortex structures have been classified into three patterns of the two-row, one-row, steady elongation. In general, both of g/D and h/D have the large values which mean the cylinder is far away from the wall and the free-surface, two-row vortex structure forms in the wake. When g/D decreases, the two-row vortex structure gradually transfers into the one-row vortex structure. When the g/D reveals the critical value below which the flow becomes steady state, resulting in the steady elongation vortex.
Keywords
Free surface; Circular cylinder; Moving wall; Direct-forcing/fictitious domain (DF/FD);
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Times Cited By KSCI : 1  (Citation Analysis)
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