计算力学学报2024，Vol.41Issue(4)：651-658,8.DOI:10.7511/jslx20240118002
极地海冰动力过程的多面体离散元方法
A polyhedral discrete element method for sea ice dynamic process in polar regions
摘要
Abstract
Sea ice in polar regions has a significant impact on navigational conditions and even climate predictions at geological scales.Addressing the shortcomings of traditional continuum-based grid models for sea ice simulation,the discrete element method(DEM)has emerged as a popular tool in floe dynamics research.In this study,we establish a discrete element method suitable for simulating polar-scale sea ice dynamics.This method employs polyhedrons based on surface triangulation to describe floating ice.The Gilbert-Johnson-Keerthi(GJK)algorithm is employed to enhance computational efficiency.The contact forces between elements are determined based on the energy conservation theory.A bond-fracture model describes the formation of level ice from freezing floes,incorporating plastic forces during the ridge formation process as proposed by Hopkins.Firstly,the accuracy of the contact force calculations is verified through the simulations of collisions between two idealized floes.Subsequently,the capability to simulate ridge formation is validated through the floe field compression under a unidirectional uniform wind.Finally,the influence of bond strength parameters on sea ice fracturing and ridge formation under shear wind conditions is studied.The results indicate that this model effectively captures the dynamics of sea ice on a geological scale and accurately depicts linear kinematic features,such as crevices and ridges,caused by linear motion in ice covers.关键词
海冰动力学/离散元方法/冰脊模型/海冰断裂Key words
sea ice dynamics/discrete element method/ridge model/sea ice fracture分类
数理科学引用本文复制引用
李继,王嗣强,王安良,季顺迎..极地海冰动力过程的多面体离散元方法[J].计算力学学报,2024,41(4):651-658,8.基金项目
国家自然科学基金(52192693 （）
52192690 （）
42176241) （）
工信部高性能船舶专项(2021-342)资助项目. （2021-342）
