The numerical method uses finite volume method in space and advances the solution in time using dual time stepping method.

空间采用中心平均的有限体积法进行离散，时间方向采用双时间法隐式推进求解。

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Residual smoothing, local time stepping and a new multi-grid scheme were employed to improve calculative efficiency and accelerate the convergence.

为提高计算效率，采用了多重网格法、当地时间步长和残差光顺等加速收敛措施。

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

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。

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But at the same time, stepping in front of a speeding train can also be painful in the short run.

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You would then waste less time and energy stepping to and from the haystack.

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Calzaghe - who had won the award three times previously - cemented his place as one of boxing's all-time greats by stepping up from the super-middleweight division he ruled for more than a decade to beat American greats Bernard Hopkins and Roy Jones Jr at light-heavyweight.

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