A nebula is really a discretemass of innumerous stars.
一团星云实际上是无数星体不连续的集合体。
2
According to Finite Element Method, the impactor is considered as a discretemass system in terms of 3D solid element with initial velocity, and 2D shell element is used for target plate.
A finite volume method was utilized to perform a discrete solution for the equations of mass, chemical components, momentum and heat energy conservation.