Simulation and modeling of extended wind-farms

Abstract eng:
We present a comparison between large eddy simulations (LES) using an actuator disk or an actuator line method with wind tunnel m_easurements performed at EPFL to analyze the accuracy of different wind turbine modeling approaches. We observe a very good agreement between the simulation results and wind tunnel measurements. We find that even on relatively coarse grids including the turbine nacelle improves the accuracy, compared to the wind tunnel data, of the flow profiles just behind the turbine in the LES. Subsequently, we use these LES to simulate the turbulent flow in extended wind-farms with very large inter turbine spacings. These LES results are compared to analytical predictions for the performance of different wind-farm configurations obtained from the Coupled Wake Boundary Layer (CWBL). We show that the CWBL model reproduces the LES results for many conditions and discuss the observed discrepancies.

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