Numerical and experimental analysis of the roll motion of a model of a waterjet vessel in regular waves

Choosing the right propulsion system is one of the important priorities of the vessel design process. Waterjet is actually a pump that is installed at the end of the vessel and its axis is rotated by the motor. This pump takes the water from under the vessel and ejects it from the back as a water jet. This action causes a reaction which is the same as the driving force or thrust. Due to its high propulsion efficiency, good maneuverability and less vibration, the waterjet propulsion system is widely used to propel marine vessels at high speed, so that the waterjet propulsion system can be a big step in the development and improvement of various vessels, especially in the field of fast vessels and be military. In this research card, the change in the form of the vessel body of the waterjet has been done in the software, and then by building the model, the behavior of the roll movement has been evaluated with the conditions of different regular waves in the traction pool. With the increase of the speed of the model, the amount of changes in the roll movement rate was also analyzed graphically. The results show that at relatively higher speeds, the rate of roll motion has a relatively high impact rate at the same encounter frequencies.