However, the usual FDM (finite difference method) schemes disregard the symplectic conservation for conservative systems.
但通常的差分格式并不考虑保辛的性质，即使对保守体系。
The transonic flow computation is performed by the use of conservative full-potential equation with exact boundary conditions and the efficient iteration scheme in finite difference method AF2.
跨音速计算采用守恒型金位势方程，精确边界条件和AF 2高效有限差分迭代算法。
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