WINDIE™ Computational Fluid Dynamics in Megajoule’s Wind Assessment Studies Versatility
WINDIE is a growing entity, constantly developed by its authors with contributions from academia, consultants and turbine manufacturers. This makes it versatile and better equipped to meet the needs of each client. An example of this is the large upgrade it recently underwent to be able to meet the data requirements of a major turbine manufacturer for its wind turbine load studies.
The WINDIE™ Validation Programme
WINDIE’s track record over the past two and a half years has been growing with increased momentum. It has been used in this period in 10 countries over three continents, in projects totalling 1.2 GW of installed power (see Figure 3). For each project, results are validated using all data available, be it cross-prediction between masts, wind farm production for wind farms in operation or sonic/light detection and ranging (SODAR/LIDAR) data. Performance is usually compared to linear model results and another CFD code to estimate the gain obtained from WINDIE.
Over 2010, the validation programme focused on resource assessment results with a compilation of 38 cross-prediction results (see Figure 4). Results were very encouraging, with an improvement in all statistical parameters.
A crucial consequence of such a gain in accuracy is a reduction in uncertainty of wind farm production estimates. With CFD becoming
1. In the Works
Megajoule Inovação, Lda, has a strong commitment to innovation, which is reflected in the strong pace of evolution of the WINDIE code. Currently, work is in progress in three main areas in WINDIE:
• the extension and validation of the turbulence produced by thermal effects for the full gamut of stratification regimes;
• the inclusion of an advanced flow-following wake model; and
• the development of a framework to conduct numerical site calibration (NSC) studies using WINDIE.
Additionally, with the increase in computational resources, the next generation of numerical CFD models will lead to the replacement of RaNS models by LES (large-eddy simulations). As such, the development of a WINDIE LES model is also well under way. n
GEWEX Atmospheric Boundary Layer Study. Available at:
www.met.wau.nl/projects/Gabls (accessed 8 March 2012).
an ever more accepted tool by financial institutions and large consultancy firms, this will significantly improve credit conditions for promoters.
Megajoule is now extending this validation programme to site assessment quantities, to comprehensively assess turbulence, shear and flow inclination predictions, in a variety of terrains, thermal regimes and terrain cover.
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