第二节 欧拉法的若干基本概念 一、恒定流和非恒定流（steady and unsteady flows） 流场各空间点上诸多水力运动要素均不随时间而变化， 称为恒定流，否则为非恒定流。 问题求解得到简化。
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The results of three dimensional steady and unsteady flows show that the methods developed in the thesis are effective.
三维定常、非定常的计算结果表明本文的方法是有效的。
Efficiency of the combined procedure was evaluated by analyzing supersonic shocks and shock propagation behaviors for both the steady and unsteady high-speed compressible flows.
通过稳态和不稳态的高速可压缩流体超音速激波和激波传播特性的分析，可以评估该算法的效率。
A numerical method for the simulation of quasi-3D steady and unsteady viscous flows in cascades has been presented.
本文给出了一个模拟叶栅内准三维定常和非定常粘性流动的数值方法。
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