Abstract
Numerical investigation of thermal stratification effects on wind turbine wake flow with and without yawed conditions was conducted in this paper. The three-dimensional wind turbine model from National Renewable Energy Laboratory (NREL) Phase VI experiment was adopted in all the simulations. Model validation was done by using three commonly used turbulence models: realizable <i>k-&epsilon;</i> model, shear-stress transport (SST) <i>k-&omega;</i> model, and large eddy simulation (LES) model. Simulation results were compared with experimental data in the literature. The realizable <i>k-&epsilon;</i> model was selected for further simulation as it showed a good balance in achieving accurate results and lowering computational cost. Followed by the validation, wind turbine wake flow with and without yawed effects under different thermal stratification conditions were simulated. Wake flow parameters were discussed and analyzed, followed by suggestions of wind turbine layouts based on different operation conditions to efficiently harness wind energy.
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