非定常Euler方程数值计算中高精度格式应用

摘要

By applying 5-order accuracy WCNS ( Weighted Compact Nonlinear Schemes) to simulate forced-oscillation of NACA0012 aerofoil, Some techniques of high-accuracy method in unsteady simulation were studied, such as inner iteration capability, inner iteration parameters of " dual time stepping" method, and discretization accuracy of time derivatives of Euler equations. The results show that, these coefficients hare a remarkable effect on computation accuracy and CPU time when WCNS scheme is applied to unsteady flow simulation.%采用五阶精度加权紧致非线性格式(WCNS)和非定常“双时间步”方法求解非定常Euler方程,模拟NACA0012翼型强迫俯仰振动流场,研究了高精度格式应用到非定常计算时“双时间步”方法物理时间步长、子迭代收敛判据、子迭代步数以及物理时间导数离散方法对计算精度和计算效率的影响.