Taking higher frequency modes into account, an accurate expansion method based on the improved first-order perturbation is put forward, which can improve the precise of modes obviously.
为此，考虑到高阶模态的影响，提出了基于改进一阶摄动法的模态高精度展开法，算例表明，此方法能显著地改善摄动特征解的精度。
In this paper, the author advances a new method for handling the vorticity boundary condition and USES the higher order accurate schemes to solve the steam function-vorticity equation.
本文提出了一种新的处理涡量边界条件的方法，并且应用了高阶精度的差分格式。
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