Abstract
The main hull encounters waves at first and causes waves to break, when trimarans are subject to the slamming in head waves. At this moment, emergence phenomena of side hulls will not occur. Thus, the slamming study of trimarans in oblique waves presents further practical significance. In this study, a CFD method is used for trimaran seakeeping and slamming analysis. An overset grid technique is adopted to simulate ship motions in waves. Firstly, to further verify the present method, a series of verification and validation studies is conducted. Then, the motion responses and slamming pressure with different control parameters, such as forward speed and ship heading angle, are calculated and discussed. The comparative results indicate that the seakeeping and slamming behaviors of trimarans differ significantly from those of conventional monohull ships. Finally, severe bow slamming and green water in oblique waves are also observed and investigated, which should be given enough attention during ship design and evaluation.
Highlights
Introduction of a Trimaran in ObliqueRegularRecently, high-performance ships have been attracting the attention of more and more researchers
This study aims to conduct a comparative study on the motion and slamming responses of trimaran advancing in oblique regular waves by CFD simulations, which will give a better understanding of the influence of wave direction on trimaran slamming performance
It can above analysis thatthat there is a is continuous load caused by transIt can be beseen seenfrom fromthe the above analysis there a continuous load caused by verse incoming flow in oblique waves, which leads to uneven pressure distribution on the transverse incoming flow in oblique waves, which leads to uneven pressure distribution leftthe and right-side hulls of theof trimaran, and even full emergence and and green water of one on left and right-side hulls the trimaran, and even full emergence green water of side hull
Summary
High-performance ships have been attracting the attention of more and more researchers. The related research on trimaran slamming mainly focuses on the simulation calculation and water-entry test by using the simplified hull section model. The above research mainly considers the slamming caused by trimaran longitudinal/vertical motion in the head wave. Many researchers pay more attention to the hull vibration induced by waves in all directions, but there are few studies on the impact of wave loads on trimaran slamming based on the whole ship model [8,9]. It is necessary to study the behavior of the hull slamming that occurs in waves based on ship motion. Simulated ship motions in both uni- and bi-directional regular waves based on the CFD method. The conclusion drawn in this study would guide the safety of ships navigating in waves
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