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Presenter: Oisin BRADY (VENTEC) Contributors: Anabel Gammidge (AMEC Wind)

Accounting for tree growth in resource assessment: A case study using the VENTOS code on Kyle wind farm. Presenter: Oisin BRADY (VENTEC) Contributors: Anabel Gammidge (AMEC Wind) J.L. Palma, F.A. Castro (CEsA-FEUP). Summary. Who are we Overview of VENTOS The site Method Results

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Presenter: Oisin BRADY (VENTEC) Contributors: Anabel Gammidge (AMEC Wind)

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  1. Accounting for tree growth in resource assessment: A case study using the VENTOS code on Kyle wind farm Presenter: Oisin BRADY (VENTEC) Contributors: Anabel Gammidge (AMEC Wind) J.L. Palma, F.A. Castro (CEsA-FEUP)

  2. Summary • Who are we • Overview of VENTOS • The site • Method • Results • Conclusions

  3. Who we are Stand 149d • VENTEC-THALES • wind resource consultancy • Specialisation in complex terrain • Analysis of operational projects • AMEC Wind Energy • UK-based developer, subsidiary of AMEC plc. • 42 MW installed • 1500 MW under development • CEsA (CENTRE FOR WIND ENERGY AND ATMOSPHERIC FLOWS ) • Porto University Engineering department • Developed VENTOS code since 1992 • Ongoing research

  4. Overview of VENTOS • CFD code • Terrain following grid • Fixed-constant k-e turbulence model • Canopy extension to boundary layer treatment • Based on work by Svensson and Haagkvist • Modification of k-e turbulence equations • Models momentum sink and added turbulence • Developed in collaboration with RES • Validation • Excellent results (windspeed, turbulence) with large areas of forest • Not so good with narrow strips (windbreaks)

  5. Kyle Forest • Scotland – southern uplands • 100 turbines over 110 km2 • 90% forest cover • Tree heights critical to model • Foliage density also required • Detailed GIS data with tree heights and species provided

  6. 2005 2017 Tree heights

  7. Method • Significant wind directions identified • Calculations run for 2005 • Results compared to measured • Modelled speedup between two mast locations within 2% of measured • Re-run for 2017 • Results normalised to undisturbed upstream location

  8. Results • In 2017 • wind speeds increase 2% to 7%. • Turbulence intensity decreases on average by 4% to 13% • Area of recirculationappears due to growthof plot of trees • Able to modify felling planbased on impact onindividual turbines

  9. Conclusions • Energy yield for a site near forest will change over time! • Forest management can potentially improve performance, without wholesale clearance • Understanding of the effect of trees on turbine output is greatly improved using VENTOS

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