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论文类型：期刊论文

发表时间：2014-01-01

发表刊物：ACTA OCEANOLOGICA SINICA

收录刊物：SCIE、CSCD、Scopus

卷号：33

期号：1

页面范围：56-63

ISSN号：0253-505X

关键字：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.