자기장을 사용한 원형주상체 주위의 유동 제어 및 저항감소

• Published in: 大韓造船學會 論文集 Vol. 41; no. 2; pp. 70 - 78
• Main Authors: 윤현식(Hyun Sik Yoon), 전호환(Ho Hwan Chun)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2004
• Subjects: 조선공학; Drag reduction(저항감소); Magnetic field(자기장); Flow control(유동 제어); Circular cylinder(원형주상체); Spectral method(스텤트럴 방법)
• ISSN: 1225-1143; 2287-7355

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.