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Title: Demonstration of the Recent Additions in Modeling Capabilities for the WEC-Sim Wave Energy Converter Design Tool: Preprint

WEC-Sim is a mid-fidelity numerical tool for modeling wave energy conversion (WEC) devices. The code uses the MATLAB SimMechanics package to solve the multi-body dynamics and models the wave interactions using hydrodynamic coefficients derived from frequency domain boundary element methods. In this paper, the new modeling features introduced in the latest release of WEC-Sim will be presented. The first feature discussed is the conversion of the fluid memory kernel to a state-space approximation that provides significant gains in computational speed. The benefit of the state-space calculation becomes even greater after the hydrodynamic body-to-body coefficients are introduced as the number of interactions increases exponentially with the number of floating bodies. The final feature discussed is the capability toadd Morison elements to provide additional hydrodynamic damping and inertia. This is generally used as a tuning feature, because performance is highly dependent on the chosen coefficients. In this paper, a review of the hydrodynamic theory for each of the features is provided and successful implementation is verified using test cases.
Authors:
; ;
Publication Date:
OSTI Identifier:
1215099
Report Number(s):
NREL/CP-5000-63528
Resource Type:
Conference
Resource Relation:
Conference: 34th International Conference on Ocean, Offshore, and Arctic Engineering (OMAE 2015), 31 May - 5 June 2015, St. John's, Newfoundland, Canada;
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy Water Power Technologies Office
Country of Publication:
United States
Language:
English
Subject:
16 TIDAL AND WAVE POWER WAVE ENERGY CONVERTERS; WEC-SIM; MODELING; NEW CAPABILITIES; BODY-TO-BODY INTERACTIONS; NREL