小行星撞遇陆地成坑动力学的计算模拟  

Computational Simulation of the Dynamics of Craters Formed by Asteroid Collisions with Land

作　　者：徐文杰[1] 刘芹芹 申旭辉 XU Wenjie;LIU Qinqin;SHEN Xuhui(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Solar Activity and Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]清华大学水圈科学与水利工程全国重点实验室,北京100084 [2]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190 [3]中国科学院国家空间科学中心太阳活动与空间天气重点实验室,北京100190

出　　处：《深空探测学报（中英文）》2024年第2期195-202,共8页Journal Of Deep Space Exploration

基　　金：中国国家航天局前期研究计划(KJSP2020020101);国家国防科技工业局项目(KJSP2020020303);中国科学院国家科学中心九章人才计划(E3RC2TQ5,E3RC2TQ4);国家自然科学基金(52079067)。

摘　　要：小行星撞遇陆地是一个复杂的非线性动力学过程,难以通过模型试验的方法开展相关研究。数值计算为这一灾害动力学过程分析提供了重要的工具,基于自主研发的CoSim软件中离散元(Discrete Element Method,DEM)模块初步实现了小行星撞遇陆地的大规模计算模拟。基于小行星撞遇陆地三维动力学全过程的数值仿真结果:实现了初始接触、撞遇挖掘、高速抛射和回落调整4个撞击阶段全过程仿真;小行星的碰撞入射角及撞遇过程中动力学行为将影响撞击坑的地形地貌特征。研究也表明大规模数值计算方法可较好地实现小行星撞遇地球这一动力学过程,为小行星防御提供支撑。TheThe process of an asteroid impacting the land is a complex non-linear dynamic process,which is difficult to study by using model tests.Numerical simulation provides an important tool for the analysis of this process.In this study,the largescale numerical simulation of the dynamic process of the asteroid impacting land was realized initially by using the self-developed software CoSim-DEM based on the discrete element method(DEM).Based on the numerical simulation results,the four stages of the impact process—initial contact,impact excavation,high-speed ejection and adjustment—were simulated;the incidence angle and the dynamic behaviors of the asteroid during the impact process would affect the topographic characteristics of the crater.This study also indicates that large-scale numerical methods can be used to perform the analysis of dynamic process of the asteroid impacting the earth,and provide support for asteroid defense.

关 键 词：小行星 撞击坑 离散元法 数值仿真 

分 类 号：P185.7[天文地球—天文学] K826.14[历史地理—历史学]