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中文摘要：
为考察有限体积法求解边界突然变化引起的流动问题的有效性,并考虑向流体机械瞬时启动问题求解的拓展,基于非结构化动网格,采用有限体积法对圆柱突然启动过程的二维非定常黏性不可压缩流动进行了数值模拟,分析了雷诺数为60-9 500的非定常流动的演化过程.在不同雷诺数下的计算结果与实验结果吻合很好.对于高雷诺数（800≤Re≤9 500）的情况,当雷诺数为5 000时捕捉到了α现象;当雷诺数为9 500时依次捕捉到了β和α现象,且流动分离区的几何参数和流型均与实验结果符合较好.同时计算得到了在不同雷诺数下圆柱的瞬态阻力系数.
英文摘要：
The finite volume method （FVM） has been validated in solving the unsteady flow problem due to boundary moved impulsively. Considering further extending this method to solve the transient flow in fluid machinery starting, the unsteady viscous flow past a circular cylinder for Reynolds numbers ranging from 60 to 9 500 were solved numerically using FVM based on the unstructured dynamic mesh. The numerical results for various Reynolds numbers were validated with the experimental observations. For the case of high Reynolds numbers （800≤Re≤9 500）, the present investigation rightly captures the a phenomena at Re=5 000 and both t3 and a phenomena at Re=9 500 one after the other. And both the geometrical parameters of the closed wake and the flow pattern agreed well with the experimental results. The drag coefficients for various Reynolds numbers were also presented.
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