Improved Description of the Manoeuvrability of Ships as Part of Increased Safety at Sea

  • Simonsen, Claus Daniel (Project Manager)

    Project Details


    In the present project it is desired to develop a method which describes the total forces from rudder, propeller and hull for a manoeuvring ship. The forces from rudder alone, propeller alone and hull alone are considered as known and focus is put on the interaction which occurs, when the rudder and the propeller are working behind the ship. Till now only limited investigations of the total flows around hull, propeller and rudder have been carried out for situations where the three parts are working together in a manoeuvring situation. The forces induced by the flow have mainly been measured individually for propeller or rudder or hull even though some measurements of the forces for the whole system have been made. However, the disadvantages connected with measurements are that the measured forces consist of the total forces acting on the ship and that the forces depend on many parameters. The idea in the project is to focus on the flow around the stern, i.e. the flow including hull, rudder and propeller at the same time. This approach should provide a more rational way of studying the interaction between the three components and make it possible to calculate the interaction forces. By analysing the flow one should be better prepared for the identification of the parameters which have important influence on the forces which also means the manoeuvrability of the ship.
    Thus the project will content numerical analysis of the flow around a manoeuvring ship for determination of important parameters for rudder-propeller-hull interaction as well as analysis of the connections between these parameters. The numerical analysis is planned to be carried out by means of a method based on solution of the Renolds Averaged Navier-Stokes Equations and the results will be validated by means of experimentally determined PMM results. In this way the project is based on both numerical and experimental methods.
    Effective start/end date01/02/199731/01/2000