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http://dx.doi.org/10.3744/SNAK.2005.42.4.368

Numerical Simulation on Laminar Flow Past a Rotary Oscillating Circular Cylinder  

Park, Jong-Chun (Dept. of NAOE, Pusan National University)
Moon, Jin-Kuk (Dept. of NAOE, Pusan National University)
Chun, Ho-Hwan (Dept. of NAOE, Pusan National University)
Suh, Sung-Bu (Research Institute of Medium and Small Ship Building)
Publication Information
Journal of the Society of Naval Architects of Korea / v.42, no.4, 2005 , pp. 368-378 More about this Journal
Abstract
The effects of rotary oscillation on the unsteady laminar flow past a circular cylinder. are numerically investigated in the present study. The numerical solutions for the 20 Wavier-Stokes equation are obtained using a finite volume method Tn the framework of an overlapping grid system. The vortex formation behind a circular cylinder and the hydrodynamics of wake flows for different rotary oscillation conditions are analyzed from the results of numerical simulation. The lock-on region is defined as the region that the natural shedding frequency due to the Karmann Vortex shedding and the forcing frequency due to the forced oscillating a cylinder are nearly same, and the quasi-periodic states are observed around that region. At the intersection between lock-on and non-lock-on region the shedding frequency is bifurcated. After the bifurcation, one frequency fellows the forcing frequency($S_f$) and the other returns to the natural shedding frequency($St_0$). in the quasi-periodic states, the variation of magnitudes and relevant phase changes of $C_L$ with forcing phase are examined.
Keywords
Rotary oscillating circular cylinder; CFD; Vortex shedding; Laminar flow; Lock-on phenomena;
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Times Cited By KSCI : 1  (Citation Analysis)
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