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http://dx.doi.org/10.5574/KSOE.2013.27.5.016

Study on Flow Around Circular Cylinder Advancing Beneath Free Surface  

Yi, Hyuck-Joon (Hyundai Heavy Industry Co. Ltd.)
Shin, Hyun-Kyung (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Yoon, Bum-Sang (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Publication Information
Journal of Ocean Engineering and Technology / v.27, no.5, 2013 , pp. 16-21 More about this Journal
Abstract
The flow around a circular cylinder advancing beneath the free surface is numerically investigated using a VOF method. The simulations cover Froude numbers in the range of 0.2~0.6 and gap ratios (h/d) in the range of 0.1~2.0, where h is the distance from the free surface to a cylinder, and d is the diameter of a cylinder at Reynolds number 180. It is observed that the vortex suppression effect and surface deformation increase as the gap ratio decreases or the Froude number increases. The most important results of the present study are as follows. The proximity of the free surface causes an initial increase in the Strouhal number and drag coefficient, and the maximum Strouhal number and drag coefficient occur in the range of 0.5~0.7. However, this trend reverses as the gap ratio becomes small, and the lift coefficient increases downward as the gap ratio decreases.
Keywords
Circular cylinder; Free surface; Vortex shedding; VOF method; Computational fluid dynamics(CFD);
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