ON THE MUTUAL INTERACTION BETWEEN HULL AND PROPELLER-RUDDER SYSTEM OF AN OBLIQUELY SAILING SHIP

A method for calculating the hydrodynamic forces acting on an obliquely sailing ship with helm angle is developed, in which the mutual interaction among hull, propeller and rudder is taken into account. The hull and rudder are treated by the surface panel method, and the propeller is expressed by a simplified propeller theory. The hull to be calculated is not limited to slender or thin because of the use of the surface panel method. A wake vortex model of an obliquely sailing hull is proposed to save computer time after an iteration procedure for determining the wake vortex shape completed. To express hydrodynamic interaction between hull and propeller-rudder system, new interaction coefficients are introduced.