TREE-DIMENSIONAL COMPUTATION FOR IN-LINE AND CROSS-FLOW VIBRATIONS OF TWO TANDEM CIRCULAR CYLINDERS AT A LOW GAP SIZE

Abstract

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