Effect of Variation in the Mass Ratio on Vortex-Induced Vibration of a Circular Cylinder in Crossflow Direction at Reynold Number = 104: A Numerical Study Using RANS Model

This study reports on the numerical analysis of impact mass ratio Vortex-Induced Vibration (VIV) phenomenon an elastically rigid cylinder, oscillating freely in a crossflow direction. Reynolds-averaged Navier–Stokes (RANS) equations with (k-ω SST) model were used to analyze flow behavior, amplitude and vortex shedding patterns. The was performed at constant Reynold number (Re) = 104 reduced velocity (Ur) ranging from 2 14 (m*) 2.4 11. defined as between vibrating cylinder fluid displaced. It found that increasing 11 resulted decrease response by 80%, 71% 31% initial branch, upper lower transition region respectively. However, branch decreased only 8% high ratio. peak observed present than previous experimental DES results. RANS k-ω SST well captured modes 2S, 2P, P + S, 2T. In 2S mode, two single pairs vortices formed, whereas 2P mode generated oscillation. Similarly, S meant one pair individual vortex; 2T triplets concluded increase results shortening lock-in response.