SPH Modelling of the Vortex-Induced Vibration of A Near-Wall Cylinder

The frequency-locked phenomenon commonly occurs in the vortex-induced vibration (VIV) of bluff bodies. Numerical simulation of this lock-in behavior is challenging, especially when the structure is positioned in close proximity to a solid boundary. To establish a robust simulator, an enhanced smoothed particle hydrodynamic (SPH) model is developed. The SPH model incorporates a particle shifting algorithm and a pressure correction algorithm to prevent cavity formation in the structure's wake area. A damping zone is also established near the outlet boundary to dissipate the vortices that shed from the structure. Additionally, GPU parallel technology is implemented to enhance the SPH model's computational efficiency. To validate the model, the predicted results are compared with the available reference data for flow past both stationary and oscillating cylinders. The verified SPH model is then employed to comparatively investigate the motion response, lift characteristic, and vortex shedding mode of cylinders with and without accounting for the effect of boundary layers. Numerical analyses demonstrate that the developed SPH model is a proficient tool for efficiently simulating the vibration of near-wall bluff bodies at low Reynolds number.