Theoretical model for determining the pressure field resulting from hull flow and operation of the marine propeller

Abstract

In this paper theoretical background is presented of the computational model used to develop the computer program for determination of the pressure field connected with flow around the hull and operation of the ship propeller. A theoretical model of the potential flow around the hull moving with steady speed on the inflexible water surface over the flat sea bed is described, as well as a model for determination of the secondary wave system connected with the flexibility restoration of the surface. A computation model is also presented of the hull boundary layer assumed in the program, results of which are used to modifying the hull form (its enlargement by the displacement boundary layer thickness) and to determining the velocity field in the area of propeller operation. A computation model of the propeller is also described, based on the deformable lifting surface theory adapted to analyzing the propeller performance within non-uniform velocity field behind the hull, with ability of detecting the cavitation and determining the pressure induced by it.