Cluster compaction of two-dimension spherical particles binary mixture as model of forming process of an asteroid

[摘要] Several two-dimension spherical particles are under influence of gravitational forces of each other and as they are colliding repulsion forces in form of linear spring-dashpot prevent them from collapsed into a single point. Gravitational constant larger than G is used for better and faster stabilization in forming cluster of the particles, accompanied with values of kN≈ 104N/m and γn≈ 0.5 N•s/m As initial conditions the particles are placed randomly with separation distances among each other. Molecular dynamics method implementing Euler algorithm is used to simulate the developing of particles cluster, which is intending to mimic the process of an asteroid forming. Time step of Δt = 102s is chosen and results are reported every some period from 1 s to 1000 s, where after each period all particles velocity are forced to be zero. It is observed that not only physical parameters influencing the compaction of the asteroid but also simulation parameters.

[发布机构] Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung; 40132, Indonesia^1;Astronomy Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung; 40132, Indonesia^2

[效力级别] 天文学

[关键词] Gravitational constant;Gravitational forces;Initial conditions;Model of forming process;Molecular dynamics methods;Physical parameters;Separation distances;Simulation parameters