TITLE:
Modeling of Adhesive Particles Using a Combination of the Two-Body Interaction and Phase-Field Methods
AUTHORS:
Takuya Uehara
KEYWORDS:
Phase Field Model, Two-Body Interaction, Multibody System, Adhesive Force, Particle Aggregation, Computer Simulation
JOURNAL NAME:
Open Journal of Modelling and Simulation,
Vol.8 No.2,
February
19,
2020
ABSTRACT: Discrete materials such as powders and granular
materials have been widely
used due to their specific characteristics. The precise evaluation is
accordingly becoming important, and various numerical schemes have been
developed. However, the interactions among the constituent particles are still
difficult to model precisely. Especially, contact conditions, which vary with
material properties and circumstances, are difficult to formulate. In this
study, a computational
model for simulating adhesive particles on contact in a many-particle system is proposed.
The interaction between the particles was represented by a two-body repulsive force that depends on the
distance between particles and an additional adhesive force at the contact
point. A phase-field variable was introduced to express the surface of each
particle, and the adhesive force was formulated using the phase-field
distribution. As a result, the adhesion of particles was properly expressed. For a
mono-particle system, neighboring particles adhered and uniformly aggregated,
while for a dual-particle system, several characteristic patterns were obtained
depending on the initial arrangement of the particles. Repulsive contact was
also considered as a specific case, and the corresponding results were obtained.