A fluid-structure interaction simulation on the wake-induced vibration of tandem cylinders with pivoted rotational motion

초록

This paper predicts the wake-induced vibration of tandem cylinders with pivoted rotational or translational motion using the fluid-structure interaction technique. Large eddy simulation using a dynamic Smagorinsky subgrid-scale model is applied for the turbulent flow. Structural computation is applied to obtain the displacement of the downstream cylinder in the cross-flow direction. Conditions such as damping ratio, natural frequency, and mass ratio of pivoted rotational motion are the same as those of translational motion. The computational conditions are R e = 3790 , 8470 and 15 160, corresponding to U * = 5.0 , 11.2 and 20.0, respectively. The unsteady characteristics of lift, drag, and cross-flow motion of tandem cylinders are investigated. Distributions of pressure, lambda 2 criterion, vorticity, and streakline are also investigated. Finally, the energy harvesting capability of the pendulum system is compared with the translation system.