Simple Method to Introduce Artificial Damping in Oscillating Surge Wave Energy Converters under Regular Waves Considering Viscous Effects
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 150, Issue 6
Abstract
The Morison equation is extensively employed to consider viscous effects in hydrodynamic investigations of diverse wave energy converters using the boundary element method (BEM). Nonetheless, linearizing the nonlinear drag component in frequency-domain analysis and determining the appropriate drag coefficients present a challenge. This paper proposes a simple method using the completely linear form of the artificial damping torque equation to consider the energy dissipation due to viscosity in the frequency-domain BEM analysis of bottom-hinged oscillating surge wave energy converters (OSWECs) under regular waves. Similar to the drag coefficient, a constant artificial damping ratio demonstrates applicability across various wave periods for a given OSWEC, with its most pronounced effects observed near the natural periods. Through scanning different values, the fittest artificial damping ratio is determined by minimizing the deviation between the BEM responses and the experimental or high-fidelity computational fluid dynamics data. In contrast to the widely varying drag coefficients, the fittest artificial damping ratios for three OSWECs with different dimensions fall within a narrow range. Hence, a recommended artificial damping ratio is proposed for the rapid approximate estimation of responses, particularly in the absence of validation data during the initial design phase.
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Data Availability Statement
All data, models, or code generated or used during the study are proprietary or confidential and may only be provided with restrictions.
Acknowledgment
The author expresses appreciation for the financial support provided by the Shanghai Post-doctoral Excellence Program (2023031).
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 150 • Issue 6 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 22, 2023
Accepted: Jun 10, 2024
Published online: Jul 17, 2024
Published in print: Nov 1, 2024
Discussion open until: Dec 17, 2024
ASCE Technical Topics:
- Boundary element method
- Continuum mechanics
- Damping
- Deformation (mechanics)
- Drag (fluid dynamics)
- Dynamics (solid mechanics)
- Energy engineering
- Energy methods
- Energy sources (by type)
- Engineering fundamentals
- Engineering mechanics
- Fluid mechanics
- Hydraulic engineering
- Hydrologic engineering
- Linear analysis
- Methodology (by type)
- Motion (dynamics)
- Numerical methods
- Oscillations
- Renewable energy
- Solid mechanics
- Structural analysis
- Structural dynamics
- Structural engineering
- Structural mechanics
- Water and water resources
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