A LAGRANGIAN INTEGRATOR FOR PLANETARY ACCRETION AND DYNAMICS (LIPAD)
A LAGRANGIAN INTEGRATOR FOR PLANETARY ACCRETION AND DYNAMICS (LIPAD)
复制标题
行星吸积和动力学拉格朗日积分器 (LIPAD)
DOI：
10.1088/0004-6256/144/4/119
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
E. Thommes
中科院分区：
文献类型：
--
作者：
H. Levison;M. Duncan;E. Thommes
我们提出了第一个基于粒子的拉格朗日代码，可以遵循碰撞/吸积/动力学演化的大量的小行星通过整个成长过程成为行星。我们称之为行星吸积和动力学的拉格朗日积分器或LIPAD。LIPAD建立在SyMBA之上，SyMBA是一个辛N体积分器。为了处理行星形成模拟所需的大量星子，我们引入了示踪粒子的概念。每一个示踪剂都代表大量的圆盘粒子，它们的轨道和大小彼此大致相同，并由三个数字来表征：物理半径、体积密度和示踪剂所代表的圆盘粒子的总质量。我们开发了统计算法，遵循示踪剂的速度和大小的演变，由于密切的引力相遇和物理碰撞彼此。示踪剂主要以正常的N体方式与较大的物体（行星胚胎）动态相互作用。LIPAD的最大优势是它可以精确地模拟由于与胚胎的引力相互作用而导致的星子的大规模重新分布，最近已经证明这会显着影响行星胚胎的生长速度。我们通过一组全面的测试来验证代码，这些测试将我们的结果与欧拉和/或直接N体代码进行比较。
We present the first particle-based Lagrangian code that can follow the collisional/accretional/dynamical evolution of a large number of kilometer-sized planetesimals through the entire growth process of becoming planets. We refer to it as the Lagrangian Integrator for Planetary Accretion and Dynamics or LIPAD. LIPAD is built on top of SyMBA, which is a symplectic N-body integrator. In order to handle the very large number of planetesimals required by planet formation simulations, we introduce the concept of a tracer particle. Each tracer is intended to represent a large number of disk particles on roughly the same orbit and size as one another and is characterized by three numbers: the physical radius, the bulk density, and the total mass of the disk particles represented by the tracer. We developed statistical algorithms that follow the velocity and size evolution of the tracers due to close gravitational encounters and physical collisions with one another. The tracers mainly dynamically interact with the larger objects (planetary embryos) in the normal N-body way. LIPAD's greatest strength is that it can accurately model the wholesale redistribution of planetesimals due to gravitational interaction with the embryos, which has recently been shown to significantly affect the growth rate of planetary embryos. We verify the code via a comprehensive set of tests that compare our results with those of Eulerian and/or direct N-body codes.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell