本文選題：撞擊坑　切入點(diǎn)：數(shù)值模擬　出處：《地學(xué)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(guò)程的一種主要方法,尤其是認(rèn)識(shí)撞擊坑形成機(jī)制的重要手段。撞擊坑形成過(guò)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(yùn)動(dòng)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(jì)算中逐步求解各個(gè)網(wǎng)格的形變、運(yùn)動(dòng)與狀態(tài)改變的規(guī)律。牛頓運(yùn)動(dòng)定律、物質(zhì)的連續(xù)體模型與熱力學(xué)方程是撞擊坑形成過(guò)程數(shù)值模擬的理論基礎(chǔ),牛頓運(yùn)動(dòng)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(qiáng)度與破裂、溫度、孔隙、振動(dòng)等聯(lián)系起來(lái),而熱力學(xué)方程則通過(guò)其他熱力學(xué)參數(shù)計(jì)算網(wǎng)格單元內(nèi)物質(zhì)的壓強(qiáng)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(guó)科學(xué)院遙感應(yīng)用研究所;北京應(yīng)用物理與計(jì)算數(shù)學(xué)研究所;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃“863”項(xiàng)目(2010AA12220101) 國(guó)家自然科學(xué)基金項(xiàng)目(41002120,41171355)
【分類號(hào)】：P184

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