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Numerical study of wave-ice floe interactions and overwash by a meshfree particle method.

Authors :
Zha, Ruosi
Zhao, Weiwen
Wan, Decheng
Source :
Ocean Engineering. Oct2023:Part 2, Vol. 286, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

The interaction between regular waves and ice floes under certain wave conditions involves overwash which is characterized by waves running up over the surface of an ice floe with large deformed free surfaces. An in-house moving particle semi-implicit (IMPS) method is employed to simulate the wave-ice floe interaction, especially for the specific behavior namely overwash due to a small freeboard of sea ice and a large body motion. In this work, a series of regular waves are generated using the Lagrangian particle method based on the Stokes wave theory. Models of the floating sea ice are simplified as circular disks without and with an edge barrier and a circular disk with a central hole, which can be used to study the influences of overwash. Hydrodynamic responses of the ice floe in regular wave conditions with different wave lengths and a constant wave height are analyzed. Compared with the mesh-based methods, the Lagrangian particle-based methods have advantages in treating highly deformed free surfaces during wave overwash processes. A piston-type wave maker and a sponge layer are applied for generating waves and avoiding the wave reflection from wall boundaries, respectively. Validations are presented including the circular ice floe with a diameter of 400 mm and a thickness of 15 mm interacting with regular waves with the wave length λ/D from 1.5 to 3.5. RAOs of the original circular disk are compared with those of the circular disks with an edge barrier and with a central hole. Overwash on the ice floe can be prevented by using an edge barrier. A new type of overwash which waves flow over the upper surface and then into the hole was proposed and simulated. The present results of numerical predictions are in good agreement with the experimental data and the published numerical results using the CFD code Flow-3D. • An in-house Moving Particle Semi-implicit method is employed to study the interactions between waves and ice floes. • The coupled surge, heave and pitch motions and their effects on overwash are analyzed. • Overwash was found over the disks in short waves. • New overwash indicates that waves can flow over disks and interact with the waves inside the ice hole. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00298018
Volume :
286
Database :
Academic Search Index
Journal :
Ocean Engineering
Publication Type :
Academic Journal
Accession number :
172978148
Full Text :
https://doi.org/10.1016/j.oceaneng.2023.115681