Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Numerical Simulation on Laminar Flow Past a Rotary Oscillating Circular Cylinder

주기 회전하는 원형 실린더 주위 층류 유동장의 수치 시뮬레이션

  • 박종천 (부산대학교 조선해양공학과) ;
  • 문진국 (부산대학교 조선해양공학과) ;
  • 전호환 (부산대학교 조선해양공학과) ;
  • 서성부 (중소조선기술연구원)
  • Published : 2005.08.01
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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

References

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