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In this work the accuracy of the Actuator Line Model (ALM) in Large EddySimulations of wind turbine flow is studied under the specific conditions ofvery coarse spatial resolutions. For finely-resolved conditions, it is knownthat ALM provides better accuracy compared to the standard Actuator Disk Model(ADM) without rotation. However, we show here that on very coarse resolutions,flow induction occurring at rotor scales can affect the predicted inflow angleand can adversely affect the ALM predictions. We first provide an illustrationof coarse LES to reproduce wind tunnel measurements. The resulting flowpredictions are good, but the challenges in predicting power outputs from thedetailed ALM motivate more detailed analysis on a case with uniform inflow. Wepresent a theoretical framework to compare the filtered quantities that enterthe Large-Eddy Simulation equations as body forces with a scaling relationbetween the filtered and unfiltered quantities. The study aims to apply thetheoretical derivation to the simulation framework and improve the currentresults for an ALM, especially in the near wake where the largest differencesare observed.

Wind Turbine Large-Eddy Simulations on Very Coarse Grid Resolutions using an Actuator Line Model