A Study of Flow Field around Full Ship Forms in Maneuvering Motion

Abstract

In the previous report dealing with oblique towing condition, the flow field around tow full ships with different aft hull-forms were investigated by numerical computation and experiments. Thereafter, additional studies of comparison between numerical computation and experiments were carried out for the same ships in steady turning condition. As in the previous investigation, detailed measurement of hydrodynamic pressure on the whole hull surface was executed, and then the longitudinal distribution of sectional lateral force was obtained by integrating the measured pressure along a contour of transverse section of ship's hull at various square stations. The measured pressure on the hull and longitudinal distribution of sectional lateral force were compared with numerical solutions of Navier-Stokes equation. The results are fully described in the present paper. The comparison denotes that agreement between numerical computation and experiments is fairly good. In particular, it should be noted that the difference in hydrodynamic lateral force and turning moment between two ships with different hull-forms can be successfully predicted by numerical computation, and the difference in maneuverability of two ships can be definitely correlated to the difference in lateral force distribution caused by the difference in hull-form by means of numerical computation and experiments as well.