Abstract
With the increased feasibility of harvesting offshore wind energy, scale of wind turbines is growing rapidly and there is a trend towards clustering together higher number of turbines in order to harvest maximum yield and to leave a smaller footprint on the environment. This causes complex flow configurations inside the farms, the study of which is essential to making offshore wind energy a success. The present study focuses on NREL 5MW wind turbine with the following objectives (a)To compare Sliding Mesh Interface and Multiple Reference Frame modeling approaches and their predictive capabilities in reproducing the characteristics of flow around the full scale wind turbine. (b)To get a better insight into wake dynamics behind the turbine in near and far wake regions operating under different tip-speed-ratio and incoming turbulence intensities.
Highlights
Introduction and objectiveResearch on the aerodynamic design of wind machines has played a significant role in the success of modern wind turbine technologies
While the FAST uses a simple Blade Element Method (BEM) to simulate the aerodynamics, the Variational Multi Scale (VMS) approach is closer to a Large Eddy Simulation (LES) based models with capabilities to resolve most of the turbulence scales
Conclusion and future work Flow simulation around a full scale 5MW NREL reference turbine was conducted with Sliding Mesh Interface (SMI) and Multiple Reference Frame (MRF) approach using k − turbulence model
Summary
Research on the aerodynamic design of wind machines has played a significant role in the success of modern wind turbine technologies. Experimental approach generally involves experimentation in wind tunnel using a scaled down model of the actual turbine or a full scale field experiment under real conditions. While the former suffers from a lack of scaling laws to extrapolate the findings in wind tunnel to a full scale, the later suffers from a lack of spatio-temporal resolution to make conclusions with confidence.
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