Direct collisional simulation of 10 000 particles past core collapse

Direct Collisional Simulation of 10,000 Particles Past Core Collapse

Accretion-driven core collapse and the collisional formation of massive stars

We consider the conditions required for a cluster core to shrink, by adiabatic accretion of gas from the surrounding cluster, to densities such that stellar collisions are a likely outcome. We show that the maximum densities attained, and hence the viability of collisions, depends on a competition between core shrinkage (driven by accretion) and core puffing up (driven by relaxation effects). T...

Parameters of Core Collapse

This paper considers the phenomenon of deep core collapse in collisional stellar systems, with stars of equal mass. The collapse takes place on some multiple, ξ−1, of the central relaxation time, and produces a density profile in which ρ ∝ r−α, where α is a constant. The parameters α and ξ have usually been determined from simplified models, such as gas and Fokker-Planck models, often with the ...

Direct Numerical Simulation of Flow Past Elliptic Cylinders

number [4] or flows at early times after an impulsive start [5]. Experimental techniques have become very sophistiFlow over elliptic cylinders can be considered prototypical of flow over a range of bluff bodies since the geometry allows one to study cated in recent years but an extensive spatial and temporal the effect of both thickness and angle-of-attack on the flow field. analysis of the thr...

Inelastic collapse of three particles.

A system of three particles undergoing inelastic collisions in arbitrary spatial dimensions is studied with the aim of establishing the domain of ‘‘inelastic collapse’’—an infinite number of collisions which take place in a finite time. Analytic and simulation results show that for a sufficiently small restitution coefficient, 0�r�7�4�3�0.072, collapse can occur. In one dimension, such a collap...