On the water entry problem of 2D wedges and bow flare section

Abstract

Slamming is a phenomenon that results from the relative motion between a ship hull and water surface in rough seas. It is associated with high impact loads and whipping which may result in structural failure. Hence accurate estimation of slamming loads is important during the structural design of ships, particularly containerships with pronounced bow flare. This paper presents the numerical analysis of the slamming loads acting on triangular wedge sections by the application of Computational Fluid Dynamic (CFD) techniques using a commercial software. The water entry of 2D sections are simulated by modelling a free surface using Eulerian multiphase and VOF method. The body is kept stationary and the free surface is moved relative to the body by solving the flow equations using unsteady implicit time marching scheme. The phenomenon is numerically simulated in in-viscid, laminar, and turbulent flow regimes by solving Euler equations, Navier-Stokes equations, and Reynolds Average Navier-Stokes equations respectively using a commercial CFD tool star-CCM+ . This methodology is applied to 2D wedge sections and bow flare section and results are compared with existing literature. The effect of viscosity on the water entry of wedge sections with various dead rise angles and bow flare section is analyzed.