난류모델 변화에 따른 블레이드 팁 영역의 공력성능예측 정확도 평가에 관한 연구
A Study on the Prediction Accuracy of the Aerodynamic Performance of a Blade Tip Region According to Various Turbulence Model Changes
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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.
Abstract
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.
참고문헌 (14)
- Villalpando, F., "Assessment of turbulence model for flow simulation around a wind turbine airfoil", Modeling and simulation in Engineering,, 2011, pp.1~8 (2011)
- Kirk, W. T., "Comparison study of CFD solver models for modeling of flow over wind turbine airfoils", Proceedings of the ASME Turbo Expo 2014 :Turbine Technical Conference and Exposition, pp.9~ (2014)
- Catalano, P., "RANS analysis of the Low-Reynolds number flow around the SD7003 airfoil", Aerospace Science and Technology, 15, pp.615~626 (2011)
- Meana-Fernandez, A., "Turbulence-model comparison for aerodynamic-performance prediction for a typical vertical-axis wind-turbine airfoil", Energies, 12(3), pp.488~ (2019)
- Timmer, W., "An overiview of NACA 6-digit airfoil series characteristics with reference to airfoils for large wind turbine blades", 47th AIAA aerospace sciences meeting including the new horizons forum and aerospace exposition, pp.268~280 (2009)
- Spalart, P., "A oneequation turbulence model for aerodynamic flow", 30th Aerospace sciences meeting and exhibit, pp.439~455 (1992)
- Daly, B. J., "Transport equations in turbulence", The physics of fluids, 13(11), pp.2634~2649 (1970)
- Launder, B. E., "The numerical computation of turbulent flows", Computer Methods in Applied Mechanics and Engineering, 3(2), pp.269~289 (1974)
- Wilcox, D. C., "Reassessment of the scale-determining equation for advanced turbulence models", AIAA Journal, 26(11), pp.1299~1310 (1988)
- Menter, F. R., "Two-equation Eddy -viscosity Turbulence Models for Engineering Applications", AIAA Journal, 32(8), pp.1598~1605 (1994)
- Langtry, R. B., "Correlation-based transition modeling for unstructured parallelized computational fluid dynamics codes", AIAA Journal, 47(12), pp.2894~2906 (2009)
- Yuan, W., "A parametric study of LES on laminar-turbulent transitional flow past an airfoil", International Journal of Computational Fluid Dynamics, 20(1), pp.45~54 (2006)
- Spalart, P. R., "Comments on the feasibility of LES for wings, and on a hybrid RANS", LES approach, LES, pp.1997[DOI]
- Sreejith, B. K., "Numerical study on effect of boundary layer trips on aerodynamic performance of E216airfoil", Engineering Science and Technology, an international journal, 21(1), pp.77~88 (2018)