Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of fragment shapes in the simulations of asteroids as
  gravitational aggregates   Remote measurements and in-situ observations confirm the idea that asteroids
up to few hundreds of meters in size might be rubble piles. The dynamics of
these objects can be studied using N-body simulations of gravitational
aggregation. We investigate the role of particle shape in N-body simulations of
gravitational aggregation. We study contact interaction mechanisms and the
effects of parameters such as surface friction, particle size distribution and
number of particles in the aggregate. We discuss the case of rubble pile
reshaping under its own self-gravity, with no spin and no external force
imposed. We implement the N-body gravitational aggregation problem with contact
and collisions between particles of irregular, non-spherical shape. Contact
interactions are modeled using a soft-contact method, considering the
visco-elastic behavior of particles' surface. We perform numerical simulations
to compare the behavior of spherical bodies with that of irregular angular
bodies. The simulations are performed starting from aggregates in
non-equilibrium state. We allow particles to settle through reshaping until
they reach an equilibrium state. Preliminary tests are studied to investigate
the quantitative and qualitative behavior of the granular media. The shape of
particles plays a relevant role in the settling process of the rubble pile
aggregate, affecting both transient dynamics and global properties of the
aggregate at equilibrium. In the long term, particle shape dominates over
simulation parameters such as surface friction, particle size distribution and
number of particles in the aggregate. Spherical particles are not suitable to
model accurately the physics of contact interactions between particles of
N-body aggregation simulations. Irregular particles are required for a more
realistic and accurate representation of the contact interaction mechanisms.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th