HYDRODYNAMIC PRESSURE ACTING ON A FULL SHIP IN OBLIQUE SHORT WAVES

Results of a numerical and experimental study on the hydrodynamic pressure acting on a full ship in oblique short waves are presented. The length of a VLCC is compared with the sea wave length. Hydrodynamic pressure on a full ship in oblique short waves is measured to investigate wave loads on the VLCC. Hydrodynamic pressure predicted with the new strip method (NSM) are compared with the measurements. The predicted results with the NSM are not in good agreement with the measurements in oblique short waves. One cause of the error is the inexact boundary condition in short waves. The other is failure to take into consideration the effect of the diffraction wave from bow, stern and bottom. The modified method for the diffraction wave term of NSM which is calculated with the exact two dimensional body boundary condition and considering the effect of the diffraction wave from bow, stern and bottom is developed. The symmetric term of diffraction pressure is used for the velocity potential for wave frequency 0. The pressure distributions with this modified method for NSM are in good agreement with the measurements in oblique short waves.