The characteristics of induced force for an in-line vibrating cylinder in a cross flow

An in-line vibrating cantilevered circular cylinder in a cross flow has been numerically studied using the multiple relaxation time lattice Boltzmann method (MRT-LBM) and immersed boundary method. To better understand the physics of separated flows behind vibrant three-dimensional bluff body, the calculation was carried out with both rigid and vibrating cases at Reynolds number of 100. For vibration case, the maximum tip amplitude and frequency are A/D = 1.0 and f_v = 0.3 (where A is the amplitude, D is the cylinder diameter and f_v is the vibrating frequency), respectively. The calculated results indicate that the streamwise vibration has significant influence on the wake patterns and make the vortex shed symmetrically and simultaneously from the cylinder. The vortex shedding is locked by the streamwise vibration and the lift is suppressed significantly.