Abstract
The present work studies the large coherent structures in large eddy simulations of windfarms using proper orthogonal decomposition (POD) method. In order to evaluate the effect of wind turbines on coherent structures, we consider three cases. One is a reference flow of a neutral atmospheric boundary layer and the other two are periodic and developing aligned windfarms. The number of wind turbines is large, 16 × 12 for periodic windfarm, and 12 × 12 for developing windfarm. The simulations are run for a long time in order to generate a sufficient database for POD analysis. In all cases, elongated streamwise counter rotating roll structures, covering 1 or 2 turbines in spanwise direction, are identified as the dominant POD mode. Another pattern, varying in streamwise direction, also appears in all the three cases.
Highlights
Research on renewable and clean energy receives more and more attentions nowadays due to the deficiency of resources available and the global warming effect
The results presented here complement the literature with new significances and are believed to be interesting to the researchers in windfarm, those using proper orthogonal decomposition (POD) as a probing tool
The convergence has been checked by applying POD to 75% of the snapshots used in the main analysis and we found no significant differences
Summary
Research on renewable and clean energy receives more and more attentions nowadays due to the deficiency of resources available and the global warming effect. In order to better understand the flow dynamics of wind turbine wakes in windfarms, the large coherent structures in windfarms are studied in this work. An in-house LES code [5, 6] is used to simulate aligned periodic and developing windfarms to investigate the effect of wind turbines on the flow structures formed inside the windfarm.
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