NUMERICAL SIMULATION OF FLOW PAST A TRANSLATING AND ROTATING CIRCULAR CYLINDER
Flow past a rotating and translating cylinder has been a subject of many investigation. Interest in this flow arises not only from the point of view of understanding wake structure interaction but also from its application to flow control. The present work is an attempt to study numerically some of the issues related to flow past a spinning cylinder in a uniform stream. In the present work the Reynolds number based on cylinder diameter and free stream speed of the flow is 200. The nondimensional rotation rate,a (ratio of the surface speed and free stream speed), is varied between 0 and 5. The time integration of the flow equations is carried out for very large dimensionless time. Third order time accurate fractional step projection method has been employed to integrate Navier-Stokes (N-S) equations in time. Control-volume based finite difference discretization of the N-S equation has been carried out in the present work in staggered grid, popularly known as MAC cell. In this type of grid alignment, the velocities and the pressure are evaluated at different locations of the control volume. the equations are discretised using standard second-order central differences for the viscous terms, the pressure gradient and divergence terms. QUICK thirdorder accurate upwind scheme is used to obtain face values for use in advection terms. For 0 a 1:9 a von K′arm′an street is seen in the wake behind the cylinder. For non-zero a the vortex street is deflected away from the center line. The wake becomes narrower and the Strouhal number for vortex shedding decreases with increase in rotation rate. Vortex shedding ceases beyond a 1:9. At high rotation rates it is seen that the lift for purely two-dimensional flows can be very large. The vorticity distribution around the cylinder goes through certain interesting changes with increase in a. For higher rotation rates the flow achieves a steady state except for 4:30 < a < 4:73 where the flow is unsteady again.
S. K. Ghosh S. Halder S. K. Mukherjea B. N. Datta
Department of Applied Mechanics and Drawing Bengal Engineering and Science University, Shibpur Howrah- 7111 03 West Bengal, India
国际会议
首届亚洲计算传热与计算流体国际会议(2007 Asian Symposium on Computational Heat Transfer and Fluid Flow)
西安
英文
2007-10-08（万方平台首次上网日期，不代表论文的发表时间）