Xu Zhijie, Tartakovsky Alexandre M, Pan Wenxiao
Computational Mathematics Group, Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jan;85(1 Pt 2):016703. doi: 10.1103/PhysRevE.85.016703. Epub 2012 Jan 5.
We present a discrete-element method (DEM) model to simulate the mechanical behavior of sea ice in response to ocean waves. The interaction of ocean waves and sea ice potentially can lead to the fracture and fragmentation of sea ice depending on the wave amplitude and period. The fracture behavior of sea ice explicitly is modeled by a DEM method where sea ice is modeled by densely packed spherical particles with finite sizes. These particles are bonded together at their contact points through mechanical bonds that can sustain both tensile and compressive forces and moments. Fracturing naturally can be represented by the sequential breaking of mechanical bonds. For a given amplitude and period of incident ocean waves, the model provides information for the spatial distribution and time evolution of stress and microfractures and the fragment size distribution. We demonstrate that the fraction of broken bonds α increases with increasing wave amplitude. In contrast, the ice fragment size l decreases with increasing amplitude. This information is important for the understanding of the breakup of individual ice floes and floe fragment size.
我们提出了一种离散元方法（DEM）模型，用于模拟海冰在海浪作用下的力学行为。海浪与海冰的相互作用可能会导致海冰根据波幅和周期而断裂和破碎。海冰的断裂行为通过离散元方法明确建模，其中海冰由密集堆积的有限尺寸球形颗粒建模。这些颗粒在其接触点通过能够承受拉力、压力和力矩的机械键结合在一起。断裂自然可以通过机械键的顺序断裂来表示。对于给定的入射海浪波幅和周期，该模型提供了应力和微裂缝的空间分布和时间演化以及碎片尺寸分布的信息。我们证明，断裂键的比例α随波幅增加而增加。相反，冰块尺寸l随波幅增加而减小。这些信息对于理解单个浮冰的破碎和浮冰碎片尺寸很重要。
