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

The Society of Naval Architects of Korea (대한조선학회)
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Flow Control and Drag Reduction of a Circular Cylinder by an External Magnetic Field

자기장을 사용한 원형주상체 주위의 유동 제어 및 저항감소

  • 윤현식 (부산대학교 첨단조선공학연구센터) ;
  • 전호환 (부산대학교 첨단조선공학연구센터)
  • Published : 2004.04.01
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Abstract

The present study numerically investigates two-dimensional laminar flow past a circular cylinder in an aligned magnetic field using the spectral method. Numerical simulations are performed for flow fields with Re=100 and 200 in the range of 0$\leq$N$\leq$10, where Ν is the Stuart number that is the ratio of electromagnetic force to inertial force. The present study reports the detailed information of flow quantities on the cylinder surface at different Stuart numbers. It is shown that the vortex shedding can be controlled by the magnetic force representing the Stuart number. As Ν increases, the vortex shedding becomes weaker, resulting in drag reduction whose magnitude is the largest at a critical value. In addition, as the magnetic force increases, the lift amplitude decreases, reaching zero at the critical number.

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References

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