Numerical investigation of streamwise vortex-induced vibration at low Reynolds numbers: mass ratio effects
In this numerical study vortex-induced vibration of a circular cylinder is analyzed using an in-house code. Mass ratio values of m* = 2,5 and 10 are investigated at Reynolds number Re = 100. A single excitation region is observed in this study that corresponds to the second excitation branch found at moderately high-Re experiments. For a system without external damping the magnitude of the streamwise fluid force was found to be zero where the vibration frequency passes through the natural frequency in vacuum. At the same point the phase angle between displacement and streamwise fluid force shows changes.