VIV and galloping of single circular cylinder with surface roughness at 3.0×104≤Re≤1.2×105

Flow Induced Vibration and Energy Extraction of an Equilateral Triangle Prism at Different System Damping Ratios

“…The VIV of the prism is driven by the imposed lift on the body from vortex shedding [1]. In the transition branch from VIV to galloping, f* declines sharply due to the coexistence of the driving mechanisms of oscillatory lift due to vortex shedding and instability inducing oscillatory lift due to shear layer motion in this transition region [6,11,12,21,22], and A*continues to increase with increasing Ur. As the prism response is in galloping branch, f* levels off at low values, and A* still exhibits an increasing trend.…”

“…Besides, this device satisfies all of the requirements set by the California Energy Commission and the U.S. DOE [9]. In order to convert more hydrokinetic energy to mechanical energy and subsequently to electrical energy over broader velocity range, Chang et al [11], Park et al [12] and Ding [13] tried to enhance the FIV of the circular cylinder by altering the cylinder surface roughness with the help of Passive Turbulence Control (PTC). The maximum energy conversion efficiency was increased from 22% [10] to 28% [13].…”

Flow induced motion and energy harvesting of bluff bodies with different cross sections

“…Until today, numerous devices have been designed to harvest energy in the ocean or river flow, such as the utilization of wave [6,7] and tidal current [8,9]. Specifically, VIVACE (Vortex Induced Vibration for Aquatic Clean Energy) converter was designed to extract clean and renewable hydrokinetic energy by utilizing FIM [5] and further developed in the Marine Renewable Energy Laboratory (MRELab) at the University of Michigan [10][11][12][13][14][15]. The simplest form of the VIVACE module is a single smooth circular cylinder mounted on springs with a power take-off system.…”

“…This is because the experiments performed by Feng [26] were tested in air environment and the oscillatory system had a much higher mass ratio. On the other hand, passive turbulence control (PTC) in the form of selectively distributed surface roughness for circular cylinder was introduced in MRELab [10,14]. Chang et al [10] investigated the circular cylinder with PTC by experiment and found that the flow over the cylinder surface altering in a way that generates higher lift, which is shown a better synchronization with the motion of cylinder.…”

Fluid-structure interaction in long-span bridges

“…It is a concern not only to IDR/UPM engineers working on the wind loading but also on marine engineering, where long pipes to attach offshore structures or to extract oil from the sea bottom can suffer it [43,44,45,46,47,48]. This structures are very slender and can not be easily accessed if they have some structural problem, so it is a major concern for the designers that they are not vibration-prone.…”