论文标题
模拟碰撞的超粒子方法
Superparticle Method for Simulating Collisions
论文作者
论文摘要
对于天体物理学，行星科学及其他问题的问题，数值模拟通常仅限于模拟粒子比实际系统少的粒子。为了模拟碰撞，需要夸大模拟颗粒（又称超级粒子），以代表真实颗粒的统一碰撞横截面。在这里，我们开发了一种基于超级粒子的方法，该方法在现实世界碰撞期间复制动能损失，以$ n $ body代码实施并进行测试。这些测试为自着碰撞系统的动态提供了有趣的见解。它们显示了粒子系统如何在几个自由秋季时间尺度上发展以形成中央浓度和平衡的外壳。可以扩展超粒子方法，以说明非弹性合并期间物体的积聚生长。
For problems in astrophysics, planetary science and beyond, numerical simulations are often limited to simulating fewer particles than in the real system. To model collisions, the simulated particles (aka superparticles) need to be inflated to represent a collectively large collisional cross section of real particles. Here we develop a superparticle-based method that replicates the kinetic energy loss during real-world collisions, implement it in an $N$-body code and test it. The tests provide interesting insights into dynamics of self gravitating collisional systems. They show how particle systems evolve over several free fall timescales to form central concentrations and equilibrated outer shells. The superparticle method can be extended to account for the accretional growth of objects during inelastic mergers.
