Wake-induced angular vibration of an eccentrically pivoted circular cylinder at low Reynolds number of 100

The wake-induced angular vibration (WIAV) of an eccentrically pivoted circular cylinder placed downstream of a fixed circular cylinder of the same size is studied using fluid–structure interaction (FSI) simulation. The Reynolds number of the uniform inflow is fixed at Re = 100. The damping ratio, mass ratio, and eccentricity of the downstream cylinder are fixed at ζ = 0, m* = 2, l = 0.35D (D is the cylinder diameter), while the center-to-center distance between two cylinders and the reduced velocity vary in L/D = 4–6 and Ur = 1–30, respectively. To study the effects of the wake interference on the flow-induced angular vibration (FIAV) of the downstream cylinder, the amplitude and frequency of the angular response, the fluid loads, the phase difference between the fluid loads and angular displacement, and the vortex pattern in the flow field are studied in detail, employing a well-validated FSI solver for FIAV of a bluff body in the laminar flow regime. The model proposed and the numerical results obtained are valuable for understanding the angular response of bluff bodies under wake interference, and are insightful for the design of WIAV-based energy harvesters with high efficiency.