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Title: Structural Loads Analysis for Wave Energy Converters: Preprint

Abstract

This study explores and verifies the generalized body-modes method for evaluating the structural loads on a wave energy converter (WEC). Historically, WEC design methodologies have focused primarily on accurately evaluating hydrodynamic loads, while methodologies for evaluating structural loads have yet to be fully considered and incorporated into the WEC design process. As wave energy technologies continue to advance, however, it has become increasingly evident that an accurate evaluation of the structural loads will enable an optimized structural design, as well as the potential utilization of composites and flexible materials, and hence reduce WEC costs. Although there are many computational fluid dynamics, structural analyses and fluid-structure-interaction (FSI) codes available, the application of these codes is typically too computationally intensive to be practical in the early stages of the WEC design process. The generalized body-modes method, however, is a reduced order, linearized, frequency-domain FSI approach, performed in conjunction with the linear hydrodynamic analysis, with computation times that could realistically be incorporated into the WEC design process. The objective of this study is to verify the generalized body-modes approach in comparison to high-fidelity FSI simulations to accurately predict structural deflections and stress loads in a WEC. Two verification cases are considered, a free-floatingmore » barge and a fixed-bottom column. Details for both the generalized body-modes models and FSI models are first provided. Results for each of the models are then compared and discussed. Finally, based on the verification results obtained, future plans for incorporating the generalized body-modes method into the WEC simulation tool, WEC-Sim, and the overall WEC design process are discussed.« less

Authors:
 [1];  [1];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1375123
Report Number(s):
NREL/CP-5000-68048
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at The American Society of Mechanical Engineers 2017 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2017), 25-30 June 2017, Trondheim, Norway
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; wave energy converter; design load; extreme condition modeling; fluid structure interaction; generalized body modes

Citation Formats

van Rij, Jennifer A, Yu, Yi-Hsiang, and Guo, Yi. Structural Loads Analysis for Wave Energy Converters: Preprint. United States: N. p., 2017. Web. doi:10.1115/OMAE2017-62139.
van Rij, Jennifer A, Yu, Yi-Hsiang, & Guo, Yi. Structural Loads Analysis for Wave Energy Converters: Preprint. United States. doi:10.1115/OMAE2017-62139.
van Rij, Jennifer A, Yu, Yi-Hsiang, and Guo, Yi. Wed . "Structural Loads Analysis for Wave Energy Converters: Preprint". United States. doi:10.1115/OMAE2017-62139. https://www.osti.gov/servlets/purl/1375123.
@article{osti_1375123,
title = {Structural Loads Analysis for Wave Energy Converters: Preprint},
author = {van Rij, Jennifer A and Yu, Yi-Hsiang and Guo, Yi},
abstractNote = {This study explores and verifies the generalized body-modes method for evaluating the structural loads on a wave energy converter (WEC). Historically, WEC design methodologies have focused primarily on accurately evaluating hydrodynamic loads, while methodologies for evaluating structural loads have yet to be fully considered and incorporated into the WEC design process. As wave energy technologies continue to advance, however, it has become increasingly evident that an accurate evaluation of the structural loads will enable an optimized structural design, as well as the potential utilization of composites and flexible materials, and hence reduce WEC costs. Although there are many computational fluid dynamics, structural analyses and fluid-structure-interaction (FSI) codes available, the application of these codes is typically too computationally intensive to be practical in the early stages of the WEC design process. The generalized body-modes method, however, is a reduced order, linearized, frequency-domain FSI approach, performed in conjunction with the linear hydrodynamic analysis, with computation times that could realistically be incorporated into the WEC design process. The objective of this study is to verify the generalized body-modes approach in comparison to high-fidelity FSI simulations to accurately predict structural deflections and stress loads in a WEC. Two verification cases are considered, a free-floating barge and a fixed-bottom column. Details for both the generalized body-modes models and FSI models are first provided. Results for each of the models are then compared and discussed. Finally, based on the verification results obtained, future plans for incorporating the generalized body-modes method into the WEC simulation tool, WEC-Sim, and the overall WEC design process are discussed.},
doi = {10.1115/OMAE2017-62139},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 09 00:00:00 EDT 2017},
month = {Wed Aug 09 00:00:00 EDT 2017}
}

Conference:
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