Large-eddy simulations of cross-flow around ship sections

Abstract

This thesis reports numerical simulations of three-dimensional (3D) unsteady cross flow over two ship sections located side-by-side. The ship sections have different breadth and draft conditions which represent typical situations in a ship-to-ship marine operation in a cross current. The mean flow field, vortex formation and hydrodynamic forces acting on the two ship sections are predicted by using CFD methods. The capacity of LES turbulence models for calculating such complex flow is studied. In order to do that, the numerical models were tested on several benchmark cases. When the ship is under cross flow, the hull behaves as a bluff body more than a slender structure. Before calculating the cross flow of two ship sections which has highly complex geometry and flow conditions, flow around more simple bluff body geometries are calculated and the result are compared with measurements.