使用GAO-YONG湍流方程组对翼型绕流的计算

将GAO-YONG湍流方程组应用到翼型复杂绕流场的计算中,研究了机械能方程中Du/Dt项和各向异性湍流黏性系数分量中的实度系数Cs的影响,给出了控制Du/Dt项作用区域和选择实度系数Cs值的判别函数,对NACA4412翼型最大升力迎角下的低速绕流算例、AS240翼型8°迎角下的转捩算例、AS240翼型19°迎角下的分离流算例进行了模拟,与实验结果比较,得到了比较好的结果.结果表明GAO-YONG湍流方程组能够准确预测翼型前缘层流到湍流的转捩问题,翼型尾迹流动松弛问题和翼型大迎角分离流.

The Calculation of Airfoil Flows Using GAO-YONG Turbulence Equations

GAO-YONG turbulence equations are applied to the complex flow of airfoil. The influence of the Du/Dt term in the mechanical energy equation and the substance coefficient Cs in orthotropic turbulence viscosity are explored, and two functions are introduced to select Du/Dt and Cs. The following airfoils in pre-stall or post-stall conditions:NACA4412, AS240 airfoil are studied and compared with the experimental data. The results show that GAO-YONG turbulence equations can generate much more realistic predictions for transitional flow around airfoil, for the flow recovery, and for great curvature separation flow.