Reproduction of an actual sea and ship motion using the all-round wave generator

The all-round wave generator, a model ship with a cargo shift simulator, and the carriage system tracking the model ship reproduced a phenomenon occurred to a fast ferry at an actual directional sea; a large roll motion and subsequent cargo collapse in a following sea condition. The all-round wave generator consisting 382 segments surrounding the whole periphery of the basin successfully reproduced the estimated directional wave field in the model scale. The analytical calculation clarified the estimated directional wave field and the corresponding encounter wave properties. A small concentrating wave triggered the first large roll motion that induced the cargo shift and then lead to the larger roll and yaw motion. Other motion data such as pitch angle and drift angle revealed how the fast ferry respond to the successive large quartering waves.