Ship & Boat ›› 2022, Vol. 33 ›› Issue (04): 105-115.DOI: 10.19423/j.cnki.31-1561/u.2022.04.105

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Numerical Investigation of Coupled Dynamics of a Shuttle Boat and Ice Floes in Waves

LIU Yongtao1, FENG Peiyuan2   

  1. 1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2. Marine Design & Research Institute of China, Shanghai 200011, China;
  • Received:2022-06-01 Revised:2022-07-05 Published:2023-03-17

波浪中接驳小艇船体和浮冰块的耦合动力学特性数值研究

刘永涛1, 封培元2   

  1. 1. 江苏科技大学 船舶与海洋工程学院 镇江 212003;
    2. 中国船舶及海洋工程设计研究院 上海 200011
  • 作者简介:刘永涛（1977-）,男,博士,副教授。研究方向：船舶与海洋工程水动力学。封培元（1987-）,男,博士,高级工程师。研究方向：船舶与海洋工程水动力学。

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Abstract: The shuttle boat that navigates in the polar seas will encounter ice floes, causing the hull of the shuttle boat to collide and ride these ice floes. In this case, the motion of the hull and the interaction between the hull and the ice floes are issues that demand attention. The SPH-DEM method is adopted to solve this problem, which involves the interaction between the wave and the floating bodies, and the interaction between these floating bodies. The smooth particle hydrodynamics (SPH) is used to solve the wave motion, the interaction between the wave and the hull and the interaction between the wave and the ice floe. And the discrete element method (DEM) is used to solve the interaction between the hull and the ice floe. The pitch, surge and heave response of the hull and the ice floe, and the interaction between the ship and the ice floe are then calculated for four conditions of 0 degree and 180 degree wave directions and two longitudinal centers of gravity in front of and behind the mid-ship section, respectively. The results show that the hull and the ice floe connect closely with relatively consistent motion response amplitude and frequency when the center of the gravity is in front of the mid-ship section. The interaction force between the hull and the ice floe is dominated by the vertical component, and the stable time-averaged values of the vertical components corresponding to 0 degree and 180 degree wave directions can reach to 44.6% and 88.9% of the hull weight, respectively. However, the hull and the ice floe are free-floating when the center of the gravity is behind the mid-ship section, with stable time-averaged values of the vertical components approximately close to zero.

Key words: ice floe, SPH-DEM, coupled dynamics

摘要： 在极区海洋环境中航行的接驳小艇遭遇浮冰块时,可能发生船冰碰触甚至骑冰的现象。该种情况下船体的运动、船体与浮冰块的相互作用力是需要关注的问题。此问题涉及波浪和浮体、浮体和浮体相互作用,该文采用基于开源框架的SPH-DEM方法求解,即：基于光滑粒子水动力学方法（SPH）求解波浪运动、波浪和船体作用、波浪和浮冰块作用,基于离散单元法（DEM）求解船体与浮冰块的相互作用。在此基础上,针对0°和180° 2种浪向、舯前和舯后2种船体重心纵向位置共4种计算工况,计算得到了船体和浮冰块的纵摇、纵荡、垂荡运动响应,以及船体和浮冰块的相互作用力。结果表明,重心在船体舯前时,船体和浮冰块紧密接触,两者运动响应幅值和频率较为一致;船体和浮冰块相互作用力以垂直分力为主,对应稳定时均值在0°、180°浪向分别可达船体自重的44.6%和88.9%;重心在船体舯后时,船体和浮冰块处于相对自由漂浮状态,垂直分力的稳定时均值接近零值。

关键词: 浮冰块, SPH-DEM, 耦合动力学

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