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对低雷诺数旋转振动圆柱绕流问题运用低维Ｇａｌｅｒｋｉｎ方法将Ｎ－Ｓ方程约化为一组非线 性常微分方程组．运用打靶法数值求解了这组方程的周期解，并用 Ｆｌｏｑｕｅｔ理论对周期解的稳 定性进行了分析，研究了流动失稳的机制．
The low-dimensional Galerkin method is used to reduce the N-S equation to a set of nonlinear ordinary differential equations for low-Reynolds-number rotationally oscillating circular cylinders. The periodic solution of this set of equations is solved numerically using the shooting method, and the stability of the periodic solution is analyzed by Floquet theory. The mechanism of the flow instability is studied.