Numerical Simulation of Local Scour around a Submerged Inclined Clinder

Local scour around a submerged cylinder is a typical issue in costal engineering. The scour depth is affected by the inclination angle of the cylinder. A three-dimensional numerical model of a submerged cylinder inclined towards different directions (upstream, vertical and downstream) was established to investigate the flow structure around the cylinder and the bed morphology affected by inclination directions and inclination angles. The results show that inclination direction changes the intensity of the downflow in front of the cylinder, which in turn influences the local scour depth and the distribution of the scour hole. In the case of upstream-inclined cylinder, the downflow is enhanced compared to the vertical case, and the scour depth is also increased. In the case of downstream-inclined cylinder, the down flow is weakened and the scour depth is decreased. The maximum scour depth around the cylinder decreases with the inclination angle in case of downstream-inclined cylinder, while in the upstream-inclined cases, the maximum scour depth does not vary monotonously with the inclination angle.