Publication

Abstract : A computational investigation on two-dimensional surface splitted (along x-axis through 0° and 180° and obtained top surface and bottom surface for the cylinder) circular cylinder has been conducted for various Richardson number ranges −1 ≤ Ri ≤ 0 and at Reynolds number 100. The negative value of Richardson number represents cooling effect on the surface of the cylinder. The cooling of surfaces of circular cylinder affects the vortex dynamics and causes variation in aerodynamic parameters and vortex shedding frequency. This work attempts to give a clear idea on changes in vortex dynamics due to cooling of top surface and bottom surface of the circular cylinder individually. Cooling effect on the surface created unstable density layers and caused asymmetry in vortex dynamics on both top half cooled and bottom half cooled cases. Cooling of top surface shown reduction in shedding frequency while cooling of bottom surface shown increase in shedding frequency, which is exactly opposite behavior. Cooling of top surface of the cylinder is an effective drag reduction method and also found reduction in shedding frequency.