对双时间步方法隐式迭代的稳定性、启动问题、子迭代初值和收敛性准则进行分析。

The stability, starting problem, initial value of sub-iteration and convergence criterion of implicit iteration of the dual-time stepping method are studied.

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求解程序采用虚拟压缩方法和双时间步的时间推进方案，对流项的差分采用高阶精度的数值差分格式。

The present solver USES a primitive variable formulation that is based on the artificial compressibility method combined with dual time stepping method.

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采用双时间步和预处理相结合的方法计算非稳态流场，保证了采用预处理方法后计算结果的时间精确性。

Time precision of calculation results of unsteady flow field was ensured by using combined method of dual-time step and preconditioning.

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