振荡三角翼非定常气动特性的数值模拟

以欧拉方程为基础，采用有限体积方法，建立了用于进行非定常流动模拟研究的计算方法。文中引用了变系数的残值光顺方法，在保证原求解方程二阶精度的前提下，使得计算效率提高了近１０倍。利用所建立的方法对绕尖锐前缘三角翼作大振幅振荡的非定常旋涡流动进行了模拟计算，收到了良好的计算效果。

The Numerical Research on the Unsteady Aerodynamics about the Delta Wing Oscillating in Pitching at High Angle of Attack

Numerical simulations are presented here about the unsteady flows around the delta wing which oscillate in pitching with large amplitude at high angle of attack. On the basis of the inviscid flow method, the unsteady Euler equations are solved with the explicit finite volume scheme; meanwhile, the implicit residual smoothing with the variable local parameter is implemented; so the computer time CPU can be reduced by a factor of 10 while keeping the second order accuracy of the numerical scheme. The results show that: (1) for the wing oscillating in pitching in the flow, the breakdown of the leeward side vortex is delayed to a higher angle of attack; (2) as the angle of attack changes, the strength of the vortex varies, but the position of the vortex almost does not change; (3) the unsteady lift and moment rings are influenced not only by the angle of attack but also by the oscillating frequency.