A Numerical Analysis of Collisions in the Solar System

太阳系碰撞的数值分析

• 批准号: 9530806
• 负责人: Eileen Ryan
• 金额: $ 5.39万
• 依托单位: Planetary Science Institute
• 依托单位国家: 美国
• 项目类别: Fixed Amount Award
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9530806&HistoricalAwards=false
• 关键词: Numerical; Analysis; Collisions; Solar; System

Eileen Ryan Planetary Science Institute FY 96: $53,917 For 24 months. A Numerical Analysis of Collisions in the Solar System. A major process affecting the growth and evolution of planetary bodies is hypervelocity impact. Although some of the basic principles of impact phenomena are moderately well understood, how material fragments near the impact site and how initial conditions affect that fragmentation have been difficult to quantify. Also, the dependence of fragmentation outcome on target size is not well defined. Dr. Ryan and colleagues have developed and tested a two-dimensional Lagrangian hydrocode for modeling collisional fragmentation. Since gravitational effects are incorporated into the code, it is highly useful in the simulation of large-scale impact events beyond the reach of laboratory studies. The ability to characterize the outcome of an impact event of any size given a particular set of initial conditions is applicable to many problems: asteroid impacts on planetary surfaces, collisional evolution of the asteroid belt, asteroid family formation, planetesimal accretion, ring particle dynamics, and meteorite delivery mechanisms, for example. The goal of Dr. Ryan's present study is to improve the modeling of impact events by modifying the 2-dimensional code to include the effect of target porosity/internal fractures. The code will then be extended to 3 dimensions during the second funding year. The results of this modeling will be applied to better undertand collisions in the Solar System, primarily the problem of the formation of asteroid families. ====================================================

Eileen Ryan Planetary Science Institute FY 96：24个月的$ 53,917。 太阳系中碰撞的数值分析。 影响行星体的生长和演变的主要过程是高速影响。 尽管对影响现象的某些基本原理众所周知，但影响部位附近的物质碎片如何以及初始条件如何影响碎片化。 同样，片段化结果对目标大小的依赖性尚未很好地定义。 Ryan博士及其同事已经开发并测试了二维拉格朗日氢化素，用于建模碰撞破碎。 由于重力效应已纳入法规，因此在模拟实验室研究超出实验室研究的大规模影响事件中非常有用。 在给定特定的初始条件的任何大小的影响事件的结果的能力中，适用于许多问题：小行星对行星表面的影响，小行星带的碰撞进化，小行星家族形成，行星促进，颗粒颗粒动力学和meteorite递送机制。 瑞安（Ryan）博士目前的研究的目的是通过修改二维代码来改善影响事件的建模，以包括目标孔隙率/内部断裂的效果。 然后，该代码将在第二个融资年度扩展到3个维度。 该建模的结果将用于更好地承担太阳系中的碰撞，主要是小行星家族形成的问题。 ====================================================