Modification of SA model for predicting airfoil flow separation
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摘要: 采用(CFD,Computational Fluid Dynamics)软件Fluent,选取(SA,Spalart-Allmaras)模型,对风力机翼型S825进行了二维数值模拟,并与实验数据进行比较.针对SA模型不能准确预测翼型尾部流动分离的情况,分析了分离区域内湍流的强非平衡输运特性.研究表明,SA模型中系数Cb1与湍流的非平衡输运特性密切相关,进而提出了修正模型系数Cb1改进SA模型的方法,结果表明该方法能够更准确地模拟风力机翼型分离流动.Abstract: Two-dimensional numerical simulation of airfoil S825 with Spalart-Allmaras(SA) turbulent model was presented. The simulation results were compared with the experiment results. As SA turbulent model could not simulate the flow separation accurately at the rear region of the airfoil, the strongly non-equilibrium turbulence transport nature in the separate region was analyzed. The non-equilibrium turbulence transport nature was closely related to the constant Cb1 in SA model. A method of modifying the constant Cb1 was adopted in SA model, and the simulation results show that the method simulates the flow separation more accurately.
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Key words:
- S825 /
- turbulent model /
- flow separation /
- turbulence transport nature
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