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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

DEVELOPMENT OF AN ADVANCED WIND TURBINE ACTUATOR LINE MODEL

Murphy Leo O'Dea
Oakland University, Rochester, MI 48309, USA

Laila Guessous
Oakland University, Rochester, MI 48309, USA

Abstract

Large-scale wind turbine installations are sited using layouts based on site topology, real estate costs and restrictions, and turbine power output. Existing optimization programs have limited capabilities to site multiple turbines and are based on simple geometric turbine wake models, which typically overestimate individual turbine output. Alternatively, complete CFD modeling of entire wind turbine fields requires enormous computational resources, which has led to the development of blade modeling techniques which are combined with CFD field computations. The most promising method, using the Actuator Line model, typically uses an exponential function to spread blade forces over CFD grid points. In addition, little development work has been performed to determine the optimal grid point density and force spreading radius for these methods. In this extended abstract, we report on our ongoing efforts to develop an advanced Actuator Line formulation which uses an alternate geometric method for distributing blade forces to the CFD field. Previous work and results are updated with further developmental work towards finding the optimum grid resolutions, time step, and force application parameters for the new Actuator Line model. The Actuator Line codes are combined with a parallel CFD program, NEK5000. A Large Eddy Simulation turbulence model is used. Results are reported for a typical large commercial wind turbine.

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