振動円柱まわりの渦挙動と空気力特性の関連性 : LESによる物理機構の検討

抄録

In order to understand physical mechanism of the vortex-induced vibration, three dimensional flow around an oscillating circular cylinder are simulated by Dynamic Subgrid scale Model. Firstly, it is confirmed that the computational results of vortex motion and aerodynamic characteristics of a stationary and an oscillating circular cylinder at Re=10^3 are in good agreement with experimental ones. Secondly, comparing with the computational results at the range of low Reynolds number by Vortex in Cell method, we investigate details of various modes of vortex mot ion. Especially the effects of Reynolds numbers on process of vortex formation, which induce drastic changes of aerodynamic forces, are focussed on.