Characteristics of Slamming Pressure and Force for Trimaran Hull

Zhe Sun,Xupeng Sui,A Korobkin,Lixin Xu,Yichen Jiang,Li Zou,Yanzeng Deng

doi:10.3390/jmse9060564

Abstract

In this paper, the characteristics of the impact pressure and force of a trimaran section was studied by Computational Fluid Dynamics (CFD). The time domain features of the slamming pressure or force showed a strong correlation with the penetration depth regardless of the specific ways of water entry. The effects of velocity and acceleration on the impact pressure and force were analyzed. It was found that the initial impact of the main hull and the wet-deck slamming were predominantly affected by the entry velocities, whilst the acceleration had almost no effect for initial impact. The impact velocity presented a quadratic relation with slamming pressure/forces, and the relation between acceleration and wet-deck slamming pressure/force was linear. These were consistent with the patterns implied by analytical models such as the Wagner or MLM (Modified Logvinovich model) theories.

Highlights

One of the immediate consequences of a ship sailing in waves is the slamming of the hull, especially the bow area
The question that this study aims to For answer is howreasons, the slamming pressure repeated here, and more details can be found in ref. [16]
The question that this study aims to answer is how the slamming pressure and force would be affected by the vertical motions if the air is free to escape

Summary

Introduction

One of the immediate consequences of a ship sailing in waves is the slamming of the hull, especially the bow area. The water rising caused by the entry of both the main hull and side hull under the wet-deck area would gradually close up the gap and generate an impulsive force (i.e., slamming) on the structure. This is quite different from the flow pattern in single body water entry process. Both model and full-scale experiments have been conducted for multihull slamming studies. Lavroff et al [4] studied the wave impact phenomenon of catamarans by means of a full-scale test of a 112 m INCAT wave-punch-catamaran and a model scale test of a

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