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- Journal Article:
Sun et al.
A hydrodynamic wind–wave combined power generation system is a new type of energy device that uses wind and ocean current energy to generate electricity. In this paper, the hydrodynamics of a wind–wave combined power generation system was simulated in Fluent. The fluid–structure coupling simulation of the vortex vibration of the cylindrical oscillator was realized using UDF and dynamic mesh…
- Journal Article:
Nishi et al.
This study carried out an experiment to develop a renewable energy system utilizing vortex induced vibration (VIV) that can drive generators even in weak flow conditions. In our experimental setup, the translation motions of a cylinder undergoing VIV and a linear-type generator (coil and magnet) are connected through a rotational machinery, which enables us to apply the principle of leverage,…
- Thesis:
Kim
Vortex Induced Vibrations for Aquatic Clean Energy (VIVACE) Converter is a converter of marine hydro-kinetic (MHK) energy invented in the Marine Renewable Energy Lab (MRELab). It harnesses MHK from ocean currents. Using passive turbulence control, VIVACE maximizes and utilizes flow induced motion in the form of vortex induced vibration (VIV) or interference/proximity/wake/soft/hard galloping.…
- Presentation:
Loeffler et al.
A second iteration of the Water Horse prototype was tested at the Tanana River Test Site in Nenana, AK in the summer of 2021. The Water Horse is an oscillating energy system that harnesses the gallop phenomenon where a bluff body immersed in a flow induces alternating lift through vortex shedding and fluid-body interactions. This updated system incorporated changes to bluff body size,…
- Presentation:
Bernitsas et al.
VIVACE-W is a fish-friendly device that can extract energy from currents and/or waves using the same physical components. It consists of 3-4 horizontal cylinders on elastic restraints designed with variable stiffness so they are in resonance with waves and/or currents. VIVACE-W uses fish-school biomimetics to generate energy from currents. Decades of studies have established…
- Journal Article:
Bai et al.
The use of bluff body, such as a circle cylinder in vortex-induced vibration (VIV) to convert current energy into electrical energy is a relatively under-utilized power generation technology with broad application prospects. To develop current energy on a 3 dimensional and enhance the synergy of the converter, the vortex-induced vibration power generation device needs to be composed of double…
- Journal Article:
Branch et al.
Arctic observations are becoming increasingly valuable as researchers investigate climate change and its associated concerns, such as decreasing sea ice and increasing ship traffic. Networks of sensors with frequent sampling capabilities are needed to run forecast models, improve navigation, and inform climate research. Sampling frequency and deployment duration are currently constrained by…
- Journal Article:
Yang et al.
Numerical and experimental studies of energy harvesting driven by vortex-induced vibration (VIV) are currently focused on arranging the energy-captured structure in a uniform incoming flow at a certain depth, ignoring the effect of the free surface on VIV. The fluid–structure coupling effect can be enhanced when a column-group structure with rigid connection is arranged under uniform flow,…
- Journal Article:
Zhang et al.
A novel bio-inspired V-shaped layout is proposed to enhance energy conversion performance for VIV hydrokinetic energy converters. The layout method is inspired by wild geese flying in a V-formation. In this paper, 2-dimensional RANS equations with the SST k-ω turbulence model are used to simulate the VIV responses at various distances. The numerical method is verified by comparing…
- Journal Article:
Sun and Bernitsas
A hydrokinetic energy converter using Flow Induced Oscillations (FIOs) of a one-degree-of-freedom cylinder-oscillator, with nonlinear adaptive damping and linear spring stiffness, is introduced and studied experimentally. Comparison to a linear-oscillator in FIO shows that this new converter, with velocity-proportional damping coefficient, is more effective in galloping, where both flow and…
- Journal Article:
Sun et al.
A design, adaptive to the flow velocity, is developed for a hydrokinetic energy converter based on an oscillator undergoing Flow Induced Vibrations (FIVs); primarily Vortex Induced Vibrations (VIV) and galloping. This Alternating-Lift Technology implements a nonlinear spring to passively optimize the oscillator. The FIV of a single, rigid, circular cylinder, with distributed surface roughness…
- Journal Article:
Sun et al.
A nonlinear oscillator, using a cubic-spring restoring function with high-deformation stiffening, is introduced and studied experimentally to improve passively the harnessed marine hydrokinetic power using Flow Induced Vibrations (FIVs) of a cylinder. In this research, the FIV of a single, rigid, circular cylinder on elastic end-supports is tested for Reynolds number 30,000 ≤ Re ≤ 120…
- Journal Article:
Shan et al.
This paper designs an underwater magnetic nonlinear piezoelectric energy harvester (PEH) based on the principle of vortex-induced vibration (VIV). The equivalent stiffness of the magnetic nonlinear PEH is significantly changed by varying the relative position of the magnet. It is observed that the proposed PEH displays hardening behavior and softening behavior due to the impact of magnetic…
- Journal Article:
Narendran et al.
A number of innovative concepts were proposed to harness energy from waves, currents, tides, and offshore winds. Over the past decade, the possibility of utilizing the oscillations due to VIV (vortex induced vibration) for possible power generation has received considerable attention. In order to understand the underlying physics behind this problem under high Reynold's number, a comprehensive…
- Journal Article:
Lian et al.
Flow-Induced Motion (FIM) of elastically-supported oscillators with "circle-polygon-attachments"sections are experimentally investigated in a water channel to examine the effects of combined sections on hydrokinetic energy harnessing. The incoming flow velocity considered is U = 0.55 – 1.35 m/s, corresponding to reduced velocity Ur = 5.3 –13. A controllable…
- Journal Article:
Panda et al.
The ocean holds vast potential as a renewable energy source, but harnessing its power has been challenging due to low-frequency and high-amplitude stimulation. However, hybrid nanogenerators (HNGs) offer a promising solution to convert ocean energy into usable power efficiently. With their high sensitivity and flexible design,…
- Journal Article:
Xu et al.
Vortex-induced vibration (VIV) of bluff bodies is one type of flow-induced vibration phenomenon, and the possibility of using it to harvest hydrokinetic energy from marine currents has recently been revealed. To develop an optimal harvester, various parameters such as mass ratio, structural stiffness, and inflow velocity need to be explored, resulting in a large number of test cases. This…
- Journal Article:
Du et al.
Micro piezoelectric generators have attracted immense interest to convert mechanical vibrations into electric energy for ultralow power wireless sensors. Herein, an ocean wave vortex-induced vibration piezoelectric energy harvester(Wavee-VIVPEH) is proposed to extract wave energy. The renewable and sustainable ocean environment energy harvesting device consists of an oscillating water column(…
- Journal Article:
Malefaki and Konstantinidis
Vortex-induced oscillations offer a potential means to harness hydrokinetic energy even at low current speeds. In this study, we consider a novel converter where a cylinder undergoes angular oscillations with respect to a pivot point, in contrast to most previous configurations, where the cylinder undergoes flow-induced oscillations transversely to the incident free stream. We formulate a…
- Journal Article:
Rashki et al.
Most previous studies on marine hydrokinetic energy harvesters focussed on clean cylindrical oscillators. The current paper presents the results of the first investigation on the vortex-induced vibrations (VIV) hydrokinetic energy conversion from cylindrical oscillators covered with soft marine fouling. The one-degree-of-freedom system oscillates in the cross-flow direction. The Reynolds…
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