Characteristics of viscous flows around large-size of container carriers, having twin-skeg stern hull form, are numerically investigated for the new concept of hull form design. To obtain an optimum angle of skeg, two types of stern hull form are studied. Computations are made by solving three dimensional incompressible Reynolds averaged Navier-Stokes and continuity equations. The computed results are compared with experimental results from the towing tank tests. The results show that the twin-skeg stern hull form is a suitable concept for large-size high speed container carrier and the computed results have a good agreement with the model test results.
Recently a large capacity of container carrier have been demanded and constructed to cope with a new trend of high speed and ultra size of ship to improve shipping efficiency and service competition. Since this sizing-up trend is accelerated, ship builders are presently investing in various aspect of technical survey to cope with the need of market. However, as the ship size increases, the large screw is required which increases the propeller loading and also makes the ship building more difficult. Large diameter of propeller disk also produces serious problems such as cavitation and pressure variation. With these difficulties, either the size and speed of ship, therefore, result the difficulties to design a propeller and a main engine. In that point of view, twin screwed ship, that has been normally adopted to the passenger ship, has been accepted and developed as a solution to overcome the difficulties especially for large/high speed ships. Series of research for the twin-skeg cargo ships have been made, by Williams(1980), Jonk(1985), van den Berg et a1.(1990) and so on.
