Journal
WIND ENERGY
Volume 22, Issue 2, Pages 269-282Publisher
WILEY
DOI: 10.1002/we.2283
Keywords
diurnal cycle; thermal effects; thermal stability; wind resource assessment; wind power density
Categories
Funding
- H2020 - High Performance Computing for Energy [689772]
- H2020 - New European Wind Atlas ERA-NET PLUS (NEWA) [618122]
- H2020 Energy - Energy oriented Centre of Excellence [676629]
- Industrial Doctorates Plan of the Government of Catalonia [eco/2497/2013]
- Simulacion Eolica de Alta Resolucion (SEDAR)
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Microscale computational fluid dynamics (CFD) models can be used for wind resource assessment on complex terrains. These models generally assume neutral atmospheric stratification, an assumption that can lead to inaccurate modeling results and to large uncertainties at certain sites. We propose a methodology for wind resource evaluation based on unsteady Reynolds averaged Navier-Stokes (URANS) simulations of diurnal cycles including the effect of thermal stratification. Time-dependent boundary conditions are generated by a 1D precursor to drive 3D diurnal cycle simulations for a given geostrophic wind direction sector. Time instants of the cycle representative of four thermal stability regimes are sampled within diurnal cycle simulations and combined with masts time series to obtain the wind power density (WPD). The methodology has been validated on a complex site instrumented with seven met masts. The WPD spatial distribution is in good agreement with observations with the mean absolute error improving 17.1% with respect to the neutral stratification assumption.
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