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The effect of second-order hydrodynamics on a floating offshore wind turbine / L. Roald, J. Jonkman and A. Robertson.
- Format:
- Book
- Government document
- Author/Creator:
- Roald, L., author.
- Jonkman, J. M. (Jason Mark), author.
- Robertson, Amy N., author.
- Series:
- NREL/TP ; 5000-61452.
- NREL/TP ; 5000-61452
- Language:
- English
- Subjects (All):
- Offshore structures--Hydrodynamics.
- Offshore structures.
- Offshore wind power plants--Computer simulation.
- Offshore wind power plants.
- Offshore electric power plants--Computer simulation.
- Offshore electric power plants.
- Genre:
- technical reports.
- Technical reports
- Technical reports.
- Physical Description:
- 1 online resource (xiii, 140 pages) : color illustrations
- Place of Publication:
- Golden, CO : National Renewable Energy Laboratory, May 2014.
- Summary:
- The design of offshore floating wind turbines uses design codes that can simulate the entire coupled system behavior. At the present, most codes include only first-order hydrodynamics, which induce forces and motions varying with the same frequency as the incident waves. Effects due to second- and higher-order hydrodynamics are often ignored in the offshore industry, because the forces induced typically are smaller than the first-order forces. In this report, first- and second-order hydrodynamic analysis used in the offshore oil and gas industry is applied to two different wind turbine concepts--a spar and a tension leg platform (TLP). The results are calculated in the frequency domain using WAMIT, with system matrices derived from linearization of turbine models in FAST. The second-order forces and motions are compared to first-order forces and motions (and also to time-domain response and loads induced by aerodynamic loading as solved by FAST). Further, it presents an analysis of second-order effects in the DeepCwind model tests, including a comparison of the model test results to WAMIT results, an assessment of how wind loading influences the second-order response and an assessment of how second-order effects influence system loads. The comparison to WAMIT results showed relatively large differences. The last part of this report discusses reasons for these differences, as well as important limitations to the second-order calculations in WAMIT.
- Contents:
- Introduction
- Hydrodynamics
- Simulation codes : capabilities and limitations
- Environmental conditions
- Spar analysis
- Tension leg platform analysis
- DeepCwind wave tank test results and analysis
- Summary and conclusions
- Recommendations for future work
- Appendix. FAST linearization process.
- Notes:
- Title from title screen (viewed Dec. 8, 2014).
- "Technical report."
- Includes footnotes, and bibliographical references (pages 135-137).
- "May 2014."
- OCLC:
- 904622092
- Publisher Number:
- 0000-0003-2990-7362 orcid
- 1132170 OSTI ID
- Access Restriction:
- Publicly released
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