Numerical Study Of Viscous Flow Around Ship Hull/Propeller/Rudder With A Body-force Propeller

Propulsion device, which is closely related with the rapidity, economy and safety ofmarine navigation, is the core of marine power. As the most important ship impeller atpresent, the propeller with rudder and hull compose a complete system, and thepropeller-hull-rudder interaction is very important for ship s many performances. Furtherresearch of propeller-hull-rudder interaction plays an important role in ship optimization,development of conventional new types of hull form and improvement of shipperformance, which has a great theoretical significance and engineering significance.In recent years, with the rapid growth of computer technology, computational fluiddynamics (CFD) has become an important research means of ship hydrodynamics.Studying propeller-hull-rudder interaction through employing CFD method can getdetailed flow information for ship design and explain the mechanism ofpropeller-hull-rudder interaction, which is obviously superior to experimental methods. IfREYNOLDS AVERAGED NAVIER-STOKES (RANS) code is used to study propeller-hull-rudder interaction, it is important to use a propeller model, which can be modeled intwo ways: one is that propeller, hull and rudder are modeled geometrically in the RANSgrid; the other is the body force method, which has the advantage of convenience ofmodeling and high computation efficiency.The problem often encountered in the research of propulsive performance andmanoeuvrability of ships is how to study propeller-hull-rudder interaction. In this thesis, ageneral purpose CFD code, FLUENT, and its UDF (User Defined Functions) are used for studying the self-propulsion, propeller-hull-rudder interaction and hydrodynamic forces ona ship in turning motion with a prescribed body-force propeller model instead of thepropeller geometry. The study shows that using the prescribed body-force propeller modelcan predict the self-propulsion accurately and quickly, and the computational results ofboth with and without propeller torque are in good agreement with experiment results. Thepreliminary research results are obtained in the study of propeller-hull-rudder andPropeller Boss Cap Fins (PBCF) with a body-force propeller model. The study also provesthat the body force method is practical for numerical prediction of the hydrodynamicsperformance on ship in turning motion.