Vortex dynamics and flow-induced vibration of a rounded-square cylinder with a detached splitter plate

For flow-induced vibration of a rounded-square cylinder under the effect proximity interference by stationary splitter plate downstream, numerical study is presented for various corner-radius R(0.1−0.5), reduced velocity U*(2−12.5), cylinder-plate gap G*(0.3,2.0), Reynolds number Re = 100, mass ratio M*=1, damping coefficient ζ=0.005, plate-length L*=1, and plate-thickness t*=0.05. R, vortex-induced (VIV)-type amplitude response observed at G*=2.0, while galloping-like shown smaller G*=0.3. VIV response, sharpness (decreasing R) leads to vibration-suppression narrower lock-in region. galloping decreasing R marginal increase in A* significant decrease frequency f* vibration. Destructive partial interactions cylinder–plate vortices are found near-wake, whereas far-wake, vortex-shedding patterns affected rounded corners cylinder, leading six different types patterns. The vortex interaction, shedding, be inter-related each other—examined with help regime maps modes shedding. downstream proximity-induced transition—from VIV-to-galloping response—leads an enhancement vibration, which larger sharper as compared that circular cylinder.