Challenges and solutions for modelling of tidal turbines
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Challenges and solutions for modelling of tidal turbines

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Peter Davies’ (Renewable Energy Technology Leader) paper looks at the potential for using existing wind turbine modelling software to model tidal turbines. While there are obvious differences ...

Peter Davies’ (Renewable Energy Technology Leader) paper looks at the potential for using existing wind turbine modelling software to model tidal turbines. While there are obvious differences between air and water, the difference in velocity makes it possible.

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Challenges and solutions for modelling of tidal turbines Presentation Transcript

  • 1. Lloyd’s Register services to the energy industryChallenges and solutions for modelling oftidal turbinesAll Energy 2012Lloyd’s RegisterMarine Renewable Energy ResearchPeter DaviesRenewable Energy Global Technology LeaderMay 2012
  • 2. Lloyd’s Register services to the energy industryThe Group at a glance• 7,500 employees of 90 nationalities• 101 companies• Four business divisions • Marine • Energy • Transportation • Management Systems (LRQA)• Anticipated annual turnover $1.0bn• In 2010 Lloyd’s Register celebrated it’s 250th anniversary• www.lr.org
  • 3. Lloyd’s Register services to the energy industryYour local, global expert
  • 4. Lloyd’s Register services to the energy industryCan horizontal axis wind turbine softwarebe used for tidal turbines?• Reynolds number is in the same range for wind and tidal turbines• W/T BEM software has been used for tidal turbines• Some of the problems • Different velocity profiles • Wake expansion may be restricted • Cavitation may be an issue
  • 5. Lloyd’s Register services to the energy industryNREL software – used in project See paper by Buhl – 2005 The NWTCDesign-Codes Suite: An Overview
  • 6. Lloyd’s Register services to the energy industryValidation 1 - using data from BAHAJ et al 2007.Power and thrust measurements of marine current turbines under varioushydrodynamic flow conditions in a cavitation tunnel and a towing tank. RenewableEnergy, 32(3), pp. 407-426
  • 7. Lloyd’s Register services to the energy industryValidation 2 - using data from BAHAJ et al 2007.Power and thrust measurements of marine current turbines under varioushydrodynamic flow conditions in a cavitation tunnel and a towing tank. RenewableEnergy, 32(3), pp. 407-426
  • 8. Lloyd’s Register services to the energy industryReasons for discrepancies• Cavitation• Wake expansion• 2D v 3D lift and drag coefficients
  • 9. Lloyd’s Register services to the energy industryOther options 1 – Harp_Opt see paper by SALE, D., NWTC DesignCodes (HARP_Opt by Danny C. Sale). http://wind.nrel.gov/designcodes/simulators/HARP_Opt/.
  • 10. Lloyd’s Register services to the energy industryOther options 2 – MB Dyn & Aero Dyn• Not tested for tidal but as using in AeroDyn should be OK• Open source• Multi Body (rather than modal model)• Status of control system model unclear• See paper “Free/Open Source Multibody and Aerodynamic Software for Aeroelastic Analysis of Wind Turbines” Fanzhong Meng / Pierangelo Masarati / Michel van Tooren
  • 11. Lloyd’s Register services to the energy industryIssues to consider in modelling the tidalenergy resource• Turbulence (horizontal and vertical)• Wave influence on velocity (horizontal and vertical)• Wave spectrum• Tidal variation• Length of simulation
  • 12. Lloyd’s Register services to the energy industryOptions for modelling resource tested by LR Description Tidal Turbulence Wave Irregular variation simple Wave Random walk No Simple Yes spreadsheet TurbSim + No Complex Yes spreadsheet Custom Yes Complex Yes programme
  • 13. Lloyd’s Register services to the energy industryCustom programme – developed by LR
  • 14. Lloyd’s Register services to the energy industryConclusions Questions Conclusions Is BEM software for HAWT valid for Yes, but with some caution horizontal axis tidal turbines ? due to physical differences in operating regime Can open source software for Yes, using FAST / Aero_Dyn horizontal axis tidal turbines be used has been demonstrated for for tidal turbines ? tidal turbines Are results from open source Yes, but cavitation may be an software reliable ? issue Can tidal resource be modelled ? Yes, several options are available Are simple tidal resource models Yes for initial design studies reliable ?
  • 15. Lloyd’s Register services to the energy industry Thank you for listening ANY QUESTIONS ?
  • 16. For more information, please contact:Peter DaviesRenewable Energy Global Technology LeaderLloyd’s Register Group Services LtdDenburn House, 25 Union TerraceAberdeen, AB10 1NNT +44 (0)1224 267771E peter.davies@lr.orgw www.lr.org/renewablesLloyd’s Register is a trading name of the Lloyd’s Register Group of entities.Services are provided by members of the Lloyds Register Group.For further information visit www.lr.org/entities