月表撞击坑形成过程数值模拟理论与方法

发布时间：2018-03-18 22:07

本文选题：撞击坑　切入点：数值模拟　出处：《地学前缘》2012年06期 　论文类型：期刊论文

【摘要】：数值模拟是研究撞击坑形成过程的一种主要方法,尤其是认识撞击坑形成机制的重要手段。撞击坑形成过程数值模拟的基本原理是用离散方法描述物质在高速撞击作用下的运动及状态,在模拟中首先将物质与空间划分成离散的网格,在每一次迭代计算中逐步求解各个网格的形变、运动与状态改变的规律。牛顿运动定律、物质的连续体模型与热力学方程是撞击坑形成过程数值模拟的理论基础,牛顿运动定律以偏微分方程的形式贯穿在离散化的网格空间中,物质的连续体模型将物质的屈服强度与破裂、温度、孔隙、振动等联系起来,而热力学方程则通过其他热力学参数计算网格单元内物质的压强与物质所处的状态。
[Abstract]:Numerical simulation is one of the main methods to study the formation of impact craters. The basic principle of numerical simulation of impact crater formation process is to describe the motion and state of matter under high velocity impact by discrete method. In the simulation, matter and space are first divided into discrete meshes. In each iteration, the laws of deformation, motion and state change of each grid are solved step by step. Newton's law of motion, Newton's law of motion, The continuum model and thermodynamic equation of material are the theoretical basis of numerical simulation of crater formation process. Newton's law of motion runs through the discrete grid space in the form of partial differential equation. The continuum model relates the yield strength of the material to the rupture, temperature, porosity, vibration and so on, while the thermodynamic equation calculates the pressure and the state of the matter in the grid cell by other thermodynamic parameters.
【作者单位】：中国科学院遥感应用研究所;北京应用物理与计算数学研究所;
【基金】：国家高技术研究发展计划“863”项目(2010AA12220101) 国家自然科学基金项目(41002120,41171355)
【分类号】：P184

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