Publication Type : Journal Article
Source : Ocean Engineering, 2011, 38(16), pp. 1713–1732
Url : https://www.sciencedirect.com/science/article/abs/pii/S0029801811001582
Campus : Amritapuri
School : School of Engineering
Department : Mechanical Engineering
Year : 2011
Abstract : Passive Turbulence Control (PTC) in the form of selectively distributed surface roughness is used to alter Flow Induced Motion (FIM) of a circular cylinder in a steady flow. The objective is to enhance FIM's synchronization range and amplitude, thus maximizing conversion of hydrokinetic energy into mechanical energy by oscillator in vortex-induced vibration and/or galloping. Through additional viscous damping, mechanical energy is converted to electrical harnessing clean and renewable energy from ocean/river currents. High Reynolds numbers (Re) are required to reach the high-lift TrSL3 (Transition-Shear-Layer-3) flow regime. PTC trips flow separation and energizes the boundary layer, thus inducing higher vorticity and consequently lift. Roughness location, surface coverage, and size are studied using systematic model tests with broad-field laser visualization at 3.0×104
Cite this Research Publication : VIV and galloping of single circular cylinder with surface roughness at 3.0×104≤Re≤1.2×105 Chang, C.-C. , Ajith Kumar, R. , Bernitsas, M.M. Ocean Engineering, 2011, 38(16), pp. 1713–1732