中文摘要：

经过在在一面飞机墙附近放的双人脚踏车安排的成双的圆形的柱体的液体流动借助于数字模拟被调查。在 D 是柱体直径的地方，二维的海军司烧方程为 0.25 ≤G/D≤2.0 和 1.0 ≤L/D≤4.0 的各种各样的无尺寸的比率在 Re=200 的一个相对低的雷纳兹数字与一个三步的有限元素方法被解决， L 是在二柱体之间的 center-to-center 距离，并且 G 是在成双的柱体和飞机墙的最低表面之间的差距。流模式的水动力学力量系数， Strouhal 数字，和旋涡上的 G/D 和 L/D 的影响被检验。三个不同旋涡流模式近醒来根据数字结果被识别。水动力学力量系数和旋涡流模式关于 G/D 和 L/D 的各种各样的联合是相当不同的，这被发现。为 G/D 的很小的价值，流的旋涡完全被压制，导致平均数平方(RMS ) 珍视的根为是的下游的柱体拖并且上升柱体和 Strouhal 数字的系数几乎零。平均数拖在上游的柱体的系数比为 G/D 和 L/D 的一样的联合的下游的柱体的大。在流模式的旋涡的变化在 RMS 价值导致重要增加，这也被观察拖并且上升系数。

英文摘要：

Fluid flow past twin circular cylinders in a tandem arrangement placed near a plane wall was investigated by means of numerical simulations. The two-dimensional Navier-Stokes equations were solved with a three-step finite element method at a relatively low Reynolds number of Re -- 200 for various dimensionless ratios of 0.25 ≤ G/D ≤2.0 and 1.0 ≤ L/D ≤ 4.0, where D is the cylinder diameter, L is the center-to-center distance between the two cylinders, and G is the gap between the lowest surface of the twin cylinders and the plane wall. The influences of G/D and L/D on the hydrodynamic force coefficients, Strouhal numbers, and vortex shedding modes were examined. Three different vortex shedding modes of the near wake were identified according to the numerical results. It was found that the hydrodynamic force coefficients and vortex shedding modes are quite different with respect to various combinations of G/D and L/D. For very small values of G/D, the vortex shedding is completely suppressed, resulting in the root mean square （RMS） values of drag and lift coefficients of both cylinders and the Strouhal number for the downstream cylinder being almost zero. The mean drag coefficient of the upstream cylinder is larger than that of the downstream cylinder for the same combination of G/D and L/D. It is also observed that change in the vortex shedding modes leads to a significant increase in the RMS values of drag and lift coefficients.