Coupled Mooring Analyses for the WEC-Sim Wave Energy Converter Design Tool

Yi-Hsiang Yu, Senu Sirnivas, Matthew Hall, Bret Bosma

Research output: Contribution to conferencePaperpeer-review

25 Scopus Citations

Abstract

A wave-energy-converter-specific time-domain modeling method (WEC-Sim) was coupled with a lumped-mass-based mooring model (MoorDyn) to improve its mooring dynamics modeling capability. This paper presents a verification and validation study on the coupled numerical method. First, a coupled model was built to simulate a 1/25 model scale floating power system connected to a traditional three-point catenary mooring with an angle of 120 between the lines. The body response and the tension force on the mooring lines at the fairlead in decay tests and under regular and irregular waves were examined. To validate and verify the coupled numerical method, the simulation results were compared to the measurements from a wave tank test and a commercial code (OrcaFlex). Second, a coupled model was built to simulate a two-body point absorber system with a chain-connected catenary system. The influence of the mooring connection on the point absorber was investigated. Overall, the study showed that the coupling of WEC-Sim and the MoorDyn model works reasonably well for simulating a floating system with practical mooring designs and predicting the corresponding dynamic loads on the mooring lines. Further analyses on improving coupling efficiency and the feasibility of applying the numerical method to simulate WEC systems with more complex mooring configuration are still needed.

Original languageAmerican English
Number of pages9
DOIs
StatePublished - 2016
EventASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016 - Busan, Korea, Republic of
Duration: 19 Jun 201624 Jun 2016

Conference

ConferenceASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016
Country/TerritoryKorea, Republic of
CityBusan
Period19/06/1624/06/16

Bibliographical note

See NREL/CP-5000-65918 for preprint

NREL Publication Number

  • NREL/CP-5000-67554

Keywords

  • Lumped-Mass Model
  • Mooring Dynamics Analysis
  • Radiation And Diffraction Theory
  • Time-Domain Numerical Model
  • Wave Energy

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