Heat transfer and wake-induced vibrations of heated tandem cylinders with two degrees of freedom: Effect of spacing ratio

The heat transfer and wake-induced vibrations of a cylinder circular cross section in the wake another identical are numerically studied this work at Reynolds number ( Re) = 100. reduced velocities Ur) varied range 2–14. downstream is allowed to oscillate two degrees freedom, i.e., transverse as well streamwise direction. mass ratio m * ) taken 10, while structural damping ignored get maximum amplitude vibration. spacing L/D) between cylinders from 1.5 6, covering major regimes, single body, reattachment, co-shedding. coefficients lift C L drag D ), vibrational amplitudes cylinder, Nusselt Nu), Strouhal St), vortex shedding patterns studied. results discussed with help lift-displacement phase plots, trajectory vorticity temperature contours. lock-in condition Ur 8 observed for all values L/D, whereas zone widest co-shedding regime L/D 6. By increasing 2.5 8, increases by 43%, upstream decreases 61%. experiences lower compared stationary isolated cylinder. A decrease average coefficient 107%, was 2, leading negative drag. Mostly, 2S C(2S) pattern observed, steady flow chaotic emerged few cases. reveal that Nu both effect each on other diminishes.