Nonlinear hydrodynamic analysis of an offshore oscillating water column wave energy converter
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In this paper, the hydrodynamic performance of a floating cylindrical oscillating water column (OWC) wave energy converter was investigated experimentally and numerically in Dalian University of Technology.Abstract:
The hydrodynamic performance of a floating cylindrical oscillating water column (OWC) wave energy converter is investigated experimentally and numerically. The physical experiment is carried out in a wave flume at Dalian University of Technology. The floating cylindrical OWC device is constrained by springs and only moves vertically. A second-order time-domain Higher-Order Boundary Element Method, based on the perturbation expansion technique, is used to simulate the nonlinear wave interaction with the floating OWC device. The nonlinear terms concerning the pneumatic and viscous damping are introduced to the free surface boundary conditions inside the OWC chamber. The chamber surface elevation and air pressure, the hydrodynamic efficiency, and the vertical displacement of the OWC device are examined in detail. Good agreements are obtained between experimental data and numerical results. Then, the effects of opening ratio, wave steepness, mooring stiffness and chamber draft on the hydrodynamic performance are then investigated. It is found that the optimal opening ratio is between 0.02 and 0.03. The mooring stiffness plays an important role on the hydrodynamic response of the OWC device. The hydrodynamic efficiency and effective frequency bandwidth increase with the mooring stiffness.read more
Citations
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Experimental and numerical analysis of a hybrid WEC-breakwater system combining an oscillating water column and an oscillating buoy
Yongke Mu and Alexander H.-D. Cheng,Lei Fu,Saishuai Dai,Maurizio Collu,Lin Cui,Zhiming Yuan,Atilla Incecik +6 more
TL;DR: In this article , an Oscillating Water Column (OWC) and an oscillating Buoy (OB) are combined to devise a hybrid WEC system that serves as a floating breakwater, where the OB is deployed upstream from the OWC.
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A heaving system with two separated oscillating water column units for wave energy conversion
TL;DR: In this article, a theoretical model based on the linear potential theory is presented for two heaving oscillating water column (OWC) devices separated by a gap, which includes relative motion and phase control between the devices and trapped water columns, and the hydrodynamic performance is evaluated.
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Semi-analytical study on an integrated-system with separated heaving OWC and breakwater: Structure size optimization and gap resonance utilization
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An immersed finite element material point (IFEMP) method for free surface fluid–structure interaction problems
TL;DR: In this article , an improved incompressible material point method (iMPM) was proposed to solve free surface fluid-structure interaction (FSI) problems, where the fluid domain is discretized by an improved iMPM using both Eulerian and Lagrangian descriptions, while the solid domain is solved by finite element method (FEM).
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Nonlinear wave loads on an offshore oscillating-water-column wave energy converter array
TL;DR: In this article , a 2nd-order time-domain OWC HOBEM model was developed to simulate the nonlinear wave action on a stationary platform that consists of four cylindrical Oscillating Water Column (OWC) Wave Energy Converters (WECs).
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