A modified discrete element model for sea ice dynamics

作     者：LI Baohui LI Hai LIU Yu WANG Anliang JI Shunying 

作者机构：Institute of OceanologyChinese Academy of Sciences Key Laboratory of Ocean Circulation and Waves (KLOCAW )Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences National Marine Environment Forecast CenterState Oceanic Administration Key Laboratory of Research on Marine Hazards ForecastingState Oceanic Administration State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2014年第33卷第1期

页      面：56-63页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0908[农学-水产] 0707[理学-海洋科学] 

基　　金：Special Fund of Marine Commonweal Industry under contact Nos 201105016 and 201205007 supported by National Marine Environment Forecasting Centre the National Natural Science Foundation of China under contact No.41176012 

主　　题：sea ice dynamics modified discrete element model contact force model numerical simulation 

摘      要：Considering the discontinuous characteristics of sea ice on various scales,a modified discrete element model（DEM） for sea ice dynamics is developed based on the granular material rheology.In this modified DEM,a soft sea ice particle element is introduced as a self-adjustive particle size function.Each ice particle can be treated as an assembly of ice floes,with its concentration and thickness changing to variable sizes under the conservation of mass.In this model,the contact forces among ice particles are calculated using a viscous-elastic-plastic model,while the maximum shear forces are described with the Mohr-Coulomb friction law.With this modified DEM,the ice flow dynamics is simulated under the drags of wind and current in a channel of various widths.The thicknesses,concentrations and velocities of ice particles are obtained,and then reasonable dynamic process is analyzed.The sea ice dynamic process is also simulated in a vortex wind field.Taking the influence of thermodynamics into account,this modified DEM will be improved in the future work.