Abstract
Model experiments for a Post-Pamamax container ship were carried out in Multi-directional (short-crested) irregular waves. The condition of principal wave direction was head sea waves. The measurement items were ship motion, vertical bending moment and wave induced pressure. Experimental results in Multi-directional waves were compared with the results of uni-directional (long-crested) waves, which were carried out in advance. We checked on the effect on a ship’s responses caused by directional spectrum waves. Besides, numerical computations, by means of slender ship theory (Enhanced Unified Theory) were also carried out. The calculation results were compared with the experimental data to check on applicability. As a result, for ship motion and vertical bending moment, there is no significant difference between uni-direction waves and multi-directional waves. On the other for wave-induced pressure, the difference can be seen depending on wave condition and the position of measurement. The numerical computation results by EUT well predict tendency of experimental results.
