Viscous flow analysis of a tug-boat using a RANS model

This project describes the computational analysis of the viscous flow around ship hulls using a RANS model. Aim of the work is to simulate the hull wake field using computational hydrodynamics techniques. The objective is to achieve a detailed characterization of the hull wake at the propeller plane in order to provide necessary information to design the new propellers of two vessels, a fishing-boat and a tug-boat. In view of the importance of viscosity effects in the modelling of the hull flow, an advanced RANS model is used for this analysis. This report describes the computational analysis addressing the tug-boat flow. Numerical simulations of the unpropelled ship (i.e., without propeller) are performed for two different operating conditions, low-speed towing and high-speed free running, at model scale and at full scale. In the present report, the theoretical and computational methodology used is described and results of flow field predictions are presented and discussed. The material contained in the present report has been included, after integration with contributions from the finnish research center VTT, into "SUPERPROP" Project Deliverable D2.1.