FLOW AROUND A CIRCULAR CYLINDER IN SHEAR FLOW
Vortex shedding and aerodynamic forces on a circular cylinder in linear shear flows with its axis normal to the plane of the velocity shear profile at subcritical Reynolds number are investigated. The shear parameter β, which is based on the velocity gradient, cylinder diameter and upstream mean velocity at the center plane of the cylinder, varies from 0 to 0.27. The Strouhal number has no significant variation with shear parameter. The time-mean base pressure increases and the fluctuating component of base pressure decreases significantly with increase in shear parameter. Vortex shedding is suppressed by the velocity shear. Dislocation of the stagnation point takes place and this influences the pressure distribution around the cylinder together with the velocity shear. Mean lift force occurs in the shear flow due to asymmetry of the pressure distribution, and it acts from the high velocity side to the low velocity side. In addition, the lift coefficient increases and the drag coefficient decreases with increase in shear parameter.
Aerodynamic force Shear parameter Vortex shedding
Shuyang CAO Yukio TAMURA
国内会议
成都
英文
716-721
2006-08-01（万方平台首次上网日期，不代表论文的发表时间）