本文采用近似因式分解(AF 2)方法，数值求解二元跨音速小扰动速势方程。

An implicit approximate factorization scheme (AF2) is employed in this paper to obtain the numerical solutions of TSD and TSTD equation.

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为实现矩阵快速求逆，文中采用了螺旋边界条件下谱因式分解的方法。

Fortunately, however, the matrix has striped shape with a helical boundary conditions.

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