Preliminary Wave Energy Converters Extreme Load Analysis

Yu, Yi Hsiang; Rij, Jennifer van; Coe, Ryan G.; Lawson, Michael

doi:10.1115/omae2015-41532

Cited by 13 publications

(13 citation statements)

References 8 publications

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“…Yu et al [9] applied a similar approach to develop a framework for analyzing WEC extreme design loads. The study included a series of Monte-Carlo-type linear time-domain simulations to determine the sea state at which extreme loads occur and a set of CFD simulations in regular waves with a statistically determined 100-year maximum wave height.…”

Section: Omae2016-54751mentioning

confidence: 99%

“…The method discretizes the time-accurate Navier-Stokes equations of motion over the computational domain and solves the system of linear equations in the time domain. This solver and numerical model were successfully applied previously for a heaving device in extreme regular waves [9]. The numerical settings used in this study are listed in Tab.…”

Section: Urans Simulationsmentioning

confidence: 99%

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Application of the Most Likely Extreme Response Method for Wave Energy Converters

Quon

Platt

et al. 2016

Volume 6: Ocean Space Utilization; Ocean Renewable Energy

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Extreme loads are often a key cost driver for wave energy converters (WECs). As an alternative to exhaustive Monte Carlo or long-term simulations, the most likely extreme response (MLER) method allows mid- and high-fidelity simulations to be used more efficiently in evaluating WEC response to events at the edges of the design envelope, and is therefore applicable to system design analysis. The study discussed in this paper applies the MLER method to investigate the maximum heave, pitch, and surge force of a point absorber WEC. Most likely extreme waves were obtained from a set of wave statistics data based on spectral analysis and the response amplitude operators (RAOs) of the floating body; the RAOs were computed from a simple radiation-and-diffraction-theory-based numerical model. A weakly nonlinear numerical method and a computational fluid dynamics (CFD) method were then applied to compute the short-term response to the MLER wave. Effects of nonlinear wave and floating body interaction on the WEC under the anticipated 100-year waves were examined by comparing the results from the linearly superimposed RAOs, the weakly nonlinear model, and CFD simulations. Overall, the MLER method was successfully applied. In particular, when coupled to a high-fidelity CFD analysis, the nonlinear fluid dynamics can be readily captured.

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Section: Omae2016-54751mentioning

confidence: 99%

Section: Urans Simulationsmentioning

confidence: 99%

Application of the Most Likely Extreme Response Method for Wave Energy Converters

Quon

Platt

et al. 2016

Volume 6: Ocean Space Utilization; Ocean Renewable Energy

Self Cite

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show abstract

“…Uncertainty around the offshore reliability includes the uncertainty in determining the extreme wave conditions. For wave energy systems, the largest loads do not always occur in the highest waves [3][4][5], and peak loads may be due to the motion history of the device and certain combinations of wave height and wave period [6]. International standards [7][8][9] suggest the best practices for determining the site-specific environmental conditions and the design load cases for marine structures, such as offshore floating wind platforms, wave energy converters, mooring systems, and offshore oil platforms.…”

Section: Introductionmentioning

confidence: 99%

Response of Point-Absorbing Wave Energy Conversion System in 50-Years Return Period Extreme Focused Waves

Katsidoniotaki

Nilsson

Rutgersson

et al. 2021

JMSE

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This work evaluates the survivability of a point-absorbing wave energy converter at sea states along and inside the 50-year environmental contour for a selected-site in North Sea, by utilizing CFD simulations. Focused wave groups based on NewWave theory are used to model the extreme waves. The numerical breaking waves have been previously predicted by the analytical breaking criterion, showing that the latter provides an accurate estimate for the breaking state. The forces on key components of the device and the system’s dynamics are studied and compared. Slamming loads are identified in the interaction with extreme waves, particularly with breaking waves, and compared with the analytical formulas for slamming estimation as suggested by industrial standards. Considering the extreme wave characteristics, the accompanied phenomena and the resulting WEC’s response, this work contributes to the identification of the design-waves given the environmental contour of the selected site. The top-left side of the contour is identified as the more critical area as it consists of steep and high waves inducing significant nonlinear phenomena, resulting in high loads.

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“…This approach, also commonly referred to as the inverse first-order method (I-FORM), was popularized for ocean systems by Winterstein and Haver [30,31]. Contour analyses have been applied for WECs in multiple studies [29,32] and are suggested for offshore structures in N-003 and DNV-RP-C205. For a desired return period, e.g., 50 years, an environmental contour is determined.…”

Section: Design Frameworkmentioning

confidence: 99%

A Survey of WEC Reliability, Survival and Design Practices

Coe

Rij

2017

Energies

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A wave energy converter must be designed to survive and function efficiently, often in highly energetic ocean environments. This represents a challenging engineering problem, comprising systematic failure mode analysis, environmental characterization, modeling, experimental testing, fatigue and extreme response analysis. While, when compared with other ocean systems such as ships and offshore platforms, there is relatively little experience in wave energy converter design, a great deal of recent work has been done within these various areas. This paper summarizes the general stages and workflow for wave energy converter design, relying on supporting articles to provide insight. By surveying published work on wave energy converter survival and design response analyses, this paper seeks to provide the reader with an understanding of the different components of this process and the range of methodologies that can be brought to bear. In this way, the reader is provided with a large set of tools to perform design response analyses on wave energy converters.

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Preliminary Wave Energy Converters Extreme Load Analysis

Cited by 13 publications

References 8 publications

Application of the Most Likely Extreme Response Method for Wave Energy Converters

Application of the Most Likely Extreme Response Method for Wave Energy Converters

Response of Point-Absorbing Wave Energy Conversion System in 50-Years Return Period Extreme Focused Waves

A Survey of WEC Reliability, Survival and Design Practices

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