本文選題：撞擊坑　切入點：數(shù)值模擬　出處：《地學前緣》2012年06期 　論文類型：期刊論文

【摘要】：數(shù)值模擬是研究撞擊坑形成過程的一種主要方法,尤其是認識撞擊坑形成機制的重要手段。撞擊坑形成過程數(shù)值模擬的基本原理是用離散方法描述物質(zhì)在高速撞擊作用下的運動及狀態(tài),在模擬中首先將物質(zhì)與空間劃分成離散的網(wǎng)格,在每一次迭代計算中逐步求解各個網(wǎng)格的形變、運動與狀態(tài)改變的規(guī)律。牛頓運動定律、物質(zhì)的連續(xù)體模型與熱力學方程是撞擊坑形成過程數(shù)值模擬的理論基礎,牛頓運動定律以偏微分方程的形式貫穿在離散化的網(wǎng)格空間中,物質(zhì)的連續(xù)體模型將物質(zhì)的屈服強度與破裂、溫度、孔隙、振動等聯(lián)系起來,而熱力學方程則通過其他熱力學參數(shù)計算網(wǎng)格單元內(nèi)物質(zhì)的壓強與物質(zhì)所處的狀態(tài)。
[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.
【作者單位】： 中國科學院遙感應用研究所;北京應用物理與計算數(shù)學研究所;
【基金】：國家高技術研究發(fā)展計劃“863”項目(2010AA12220101) 國家自然科學基金項目(41002120,41171355)
【分類號】：P184

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