초록

In this study, the prediction accuracy of the aerodynamic performance of the RANS and DES turbulence models through 3-D unsteady CFD analysis under high Reynolds number conditions were compared and analyzed for NACA64-618 airfoils. Numerical simulations were performed by applying the Reynolds Averaged Navier-Stokes (RANS)-based turbulence model and Detached Eddy Simulation (DES) model, and the simulation results were compared with wind tunnel test results. The realizable k-ε turbulence model failed to predict the flow separation point and the size of the recirculation region, resulting in very low aerodynamic performance, and the S-A turbulence model showed a characteristic of over-predicting the drag coefficient after the stall point. The SST K-ω γ-Re-θ model and the DES model had excellent prediction accuracy in drag coefficient at a low angle of attack and lift coefficient after stall angle of attack. When comparing two turbulence models in terms of computational efficiency, it is recommended to apply the SST K-ω γ-Re-θ model.

키워드

전산유체역학, 난류모델, 에어포일, 공력성능, 유동특성, 풍력터빈 블레이드

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