Journal of Advanced Research in Ocean Engineering

Korean Society of Ocean Engineers (한국해양공학회)
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Impact onto an Ice Floe

  • Khabakhpasheva, Tatyana (School of Mathematics, University of East Anglia) ;
  • Chen, Yang (Department of Naval Architecture and Marine Engineering, University of Michigan) ;
  • Korobkin, Alexander (School of Mathematics, University of East Anglia) ;
  • Maki, Kevin (Department of Naval Architecture and Marine Engineering, University of Michigan)
  • Received : 2018.09.30
  • Accepted : 2018.11.18
  • Published : 2018.12.31
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Abstract

The unsteady problem of a rigid body impact onto a floating plate is studied. Both the plate and the water are at rest before impact. The plate motion is caused by the impact force transmitted to the plate through an elastic layer with viscous damping on the top of the plate. The hydrodynamic force is calculated by using the second-order model of plate impact by Iafrati and Korobkin (2011). The present study is concerned with the deceleration experienced by a rigid body during its collision with a floating object. The problem is studied also by a fully-nonlinear computational-fluid-dynamics method. The elastic layer is treated with a moving body-fitted grid, the impacting body with an immersed boundary method, and a discrete-element method is used for the contact-force model. The presence of the elastic layer between the impacting bod- ies may lead to multiple bouncing of them, if the bodies are relatively light, before their interaction is settled and they continue to penetrate together into the water. The present study is motivated by ship slamming in icy waters, and by the effect of ice conditions on conventional free-fall lifeboats.

Keywords

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Fig. 1. Two-dimensional slamming for open water (a), with ice floe (b), which is attaced to the body surface later on (c), with an ice floe near the impact region (d), several floes under and near the body surface (e) and floes on the body surface (f).

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Fig. 2. Impact on a floating elastic plate of large length.

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Fig. 3. Impact of two spheres studied by Joukowski (1884).

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Fig. 4. Impact on a floating plate with an elastic layer on the top of it before the interaction (a) and during the interaction (b).

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Fig. 5. Comparison of the theoretical and numerical results for the plate indentation h, dis- placements hp and hb, speeds $h_{p}^{'}$ and $h_{b}^{'}$ and the accelerations $h_{p}^{''}$ and $h_{b}^{''}$ of the plate and the body, respectively, as functions of time t.

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Fig. 6: Impact of a large body onto a floating plate with pile-up effect.

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Fig. 7. Non-dimensional penetration depth of the body (a) and the non-dimensional hydrody- namic force (b) as functions of the scaled length, c/l, of the wetted part of the body surface.

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