WEC-Sim is a computationally efficient, midfidelity model based on linearized potential flow theory.
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As a participant in the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 2, this study uses two computational fluid dynamics methods, WEC-Sim and STAR-CCM+, to evaluate three focused waves on two WEC-like bodies.
However, the ability of computational methods to accurately simulate the prescribed focused waves and resulting wave structure interactions are not well-validated. Increasingly, focused waves are used as a design method to predict extreme loads for offshore structures, such as wave energy converters (WECs). The WEC-Sim simulated responses, when using viscous coefficients tuned to the measured displacements, are, on average, within 11.5% of experimentally measured values, whereas the STAR-CCM+ simulated responses are, on average, within 14.2% of the experimental values. The resulting STAR-CCM+ generated focused waves have approximately the same accuracy, in comparison with the analytic solution, as experimentally generated focused waves. Three prescribed focused waves are generated in both codes, and the simulated displacements and mooring loads are obtained for each of the hydrodynamic bodies. The two buoy geometries considered are a more » hemispherical-bottom cylinder and a truncated cylinder with a cylindrical moon pool. In contrast, STAR-CCM+ is a high-fidelity, three-dimensional, unsteady, Reynolds-averaged Navier–Stokes-based model. WEC-Sim is a computationally efficient, mid-fidelity model, based on linearised potential flow theory. This study uses two computational fluid dynamic methods, WEC-Sim and STAR-CCM+, to evaluate the responses of two taut-moored WEC-like buoys to three different focused waves. However, the ability of computational methods to accurately simulate the prescribed focused waves and resulting wave structure interactions is not well validated. Wind Energy Technologies Office USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W) OSTI Identifier: 1515194 Alternate Identifier(s): OSTI ID: 1525306 Report Number(s): SAND-2019-4731J NREL/JA-5000-72447 Journal ID: ISSN 2198-6444 675051 Grant/Contract Number: NA0003525 EE0007346 AC36-08GO28308 Resource Type: Accepted Manuscript Journal Name: Journal of Ocean Engineering and Marine Energy Additional Journal Information: Journal Volume: 5 Journal Issue: 2 Journal ID: ISSN 2198-6444 Publisher: Springer International Publishing Country of Publication: United States Language: English Subject: 16 TIDAL AND WAVE POWER wave energy converter (WEC) extreme survival design load CFD wave energy converter = ,įocused waves are increasingly used as a design method to predict extreme loads for offshore structures, such as wave energy converters (WECs). Water Power Technologies Office USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. (NREL), Golden, CO (United States) Sponsoring Org.: USDOE National Nuclear Security Administration (NNSA) USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. (SNL-NM), Albuquerque, NM (United States) Oscilla Power, Inc., Seattle, WA (United States) National Renewable Energy Lab. Publication Date: Research Org.: Sandia National Lab.
For the high-fidelity model, two design wave approaches (an equivalent regular wave and a focused wave) are used to estimate the worst case wave forcing within a realistic irregular sea state. In both models, the dynamics of the WEC power take-off and mooring system have been included. Here, the mid-fidelity approach is a time-domain model based on linearized potential flow hydrodynamics and the high-fidelity modeling tool is an unsteady Reynolds-averaged Navier-Stokes model. This paper details a study to predict extreme loading in a two-body WEC using a combination of mid-fidelity and high-fidelity numerical modeling tools. Although engineering design and analysis tools used for other ocean systems, such as offshore structures and ships, can be applied, the unique nature and limited historical experience of WEC design necessitates assessment of the effectiveness of these methods for this specific application. Wave energy converters (WECs) must survive in a wide variety of conditions while minimizing structural costs, so as to deliver power at cost-competitive rates.
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