Time precision of calculation results of unsteady flow field was ensured by using combined method of dual-time step and preconditioning.
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。
For steady computation, local time step method is used; for unsteady computation, dual time stepping method is used.
定常计算采用当地时间步法，非定常计算采用双时间步法。
For steady computation, local time step method is used; for unsteady computation, dual time stepping method is used.
定常计算采用当地时间步法，非定常计算采用双时间步法。
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