Numerical investigations of a 2D bow wedge asymmetric free-falling into still water

Abstract

The process of asymmetric water entry of a 2D bow is studied using the computational fluid dynamics (CFD) model with STAR-CCM+. The necessity of including the turbulence model in this investigation is discussed. The behaviors of bow slamming pressure, slamming pressure coefficients, slamming velocities with different deflection angles (0–10°) are discussed. The typical bow cross-section is simplified as a wedge with a deadrise angle of 45°. A numerical simulation was conducted and a good agreement was achieved between the numerical results and the experimental data. The results show that the turbulence model should be carefully considered in numerical simulation when the slamming occurs over time scales that are much shorter in duration than the time scales over which viscosity and gravity act on the flow. Additionally, with the increase in deflection angle, the slamming pressure coefficients increase on the upstream surface. And the slamming pressure coefficients decrease on the back stream surface. The jet area increases on the upstream surface and decreases on the back stream surface with the wedge asymmetric water entry.