Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Investigation on the Slamming of Wedge-shaped Body with Oblique Free Entry into Water
Gaoli Wang,Qiaorui Wu *, Minghui Chen, Yonghe Xie, Hui-min Yu
College of Naval Architecture and Maritime, Zhejiang Ocean University.
Zhoushan, Zhejiang, China

points are established at the bottom, front and back of the wedge tomonitor the change of slamming pressure in the process of water
slamming.

ABSTRACTThe entry of objects into water is a phenomenon with very complex
impact dynamics characterized with strong nonlinearity, which widelyexists in the field of Naval Architecture and Ocean Engineering. In
previous studies, the object's entry into the water focused mainly on thevertical entry into the water. In the reality, the structure enters into thewater freely and mostly at a certain angle. Therefore, it is necessary toexplore the problem of oblique water entry of objects. In order to explore
the law and mechanism of the wedge-shaped free entry slamming ofstructures, this paper conducts a numerical simulation analysis on theoblique free entry of the wedge. Firstly, the entry process of the wedge
with an inclination angle of 10° was simulated. And on the basis,
different conditions were chosen to study further by changing theinclination angle and the initial speed. By analyzing the numerical results
under different conditions, some conclusion can be derived as follows:
During the water entry process of the wedge-shaped with different initial
falling speeds, the larger the initial falling speed, the faster the slamming
load, torque and pressure peaks of the wedge during the slamming
process varies, and as well as the value of the physical quantity; As forthe slamming process of wedge-shaped bodies with different inclination
angles, the mutation of the slamming loads will vary with the inclining
angle.

By overlapping meshes, information can be transmitted between wedge
and computational domain, and meshes can be updated, while thecomputational complexity of running simulation is also reduced. After
generating the grid, rotate the wedge around the center of mass by 10degrees, and get the grid partition diagram of the wedge slamming intowater, as shown in Figure 2. Then, create water surface and set parameter
information, create new automatic mesh, select parts to generate mesh,
set basic size, and separate the overlapping area from the basic size meshof calculation domain, which is convenient to reduce the amount of meshgeneration.

KEY WORDS: Oblique free water entry; inclining angle; wedgeshaped; slamming load.
Fig. 1 Schematic diagram of inclined wedge-shaped body slamming
into waterINTRODUCTION
In this paper, the problem of wedge-shaped body's inclined entry into
water is studied. The situation of ship slamming into water when sailingis very complicated. When the ship encounters big waves, it will moveup and down, there will be vertical and horizontal movements,
accompanied by rotational movements. When the wedge slams the water
surface, the slamming pressure on both sides of the bottom is different
due to the horizontal velocity. The wedge will rotate during falling.
Create a coordinate system at the centroid of the wedge, which moves
with the movement of the wedge. As shown in Figure 1, the slammingpressure of the two sides slamming against the water surface is different
because of the different contact areas of the two sides at the bottom of
the wedge with the water surface. In this study, the right side of thewedge is called the front side, and the left side is the back side. ThreeFig. 2 Grid division diagram of inclined wedge-shaped body slamming
into water

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