接近した直列２円柱における上流側円柱の流れ方向および流れ直交方向の流力振動に関する３次元数値解析

抄録

We present numerical results for hydrodynamic vibrations of an upstream circular cylinder in tandem arrangement which is mounted in a uniform flow. Two circular cylinders are assumed as each rigid body, and the upstream circular cylinder is supported by damper-spring systems in in-line and cross-flow directions. In our computations, the gap ratios of two kinds between the centers of two circular cylinders are taken into consideration and they are given as 2 and 3 which are smaller than the critical gap ratio. In addition, the Scruton number is set as 0.99. Vibration amplitudes in the in-line and cross-flow directions of the upstream circular cylinder are computed by a third-order upwind finite element scheme and the numerical results are discussed in detail.