7 research outputs found
Finite-difference methods for simulation models incorporating non-conservative forces
We discuss algorithms applicable to the numerical solution of second-order
ordinary differential equations by finite-differences. We make particular
reference to the solution of the dissipative particle dynamics fluid model, and
present extensive results comparing one of the algorithms discussed with the
standard method of solution. These results show the successful modeling of
phase separation and surface tension in a binary immiscible fluid mixture.Comment: 27 pages RevTeX, 9 figures, J. Chem. Phys. (in press
Spinodal decomposition of off-critical quenches with a viscous phase using dissipative particle dynamics in two and three spatial dimensions
We investigate the domain growth and phase separation of
hydrodynamically-correct binary immiscible fluids of differing viscosity as a
function of minority phase concentration in both two and three spatial
dimensions using dissipative particle dynamics. We also examine the behavior of
equal-viscosity fluids and compare our results to similar lattice-gas
simulations in two dimensions.Comment: 34 pages (11 figures); accepted for publication in Phys. Rev.
Computer simulations of domain growth and phase separation in two-dimensional binary immiscible fluids using dissipative particle dynamics
We investigate the dynamical behavior of binary fluid systems in two
dimensions using dissipative particle dynamics. We find that following a
symmetric quench the domain size R(t) grows with time t according to two
distinct algebraic laws R(t) = t^n: at early times n = 1/2, while for later
times n = 2/3. Following an asymmetric quench we observe only n = 1/2, and if
momentum conservation is violated we see n = 1/3 at early times. Bubble
simulations confirm the existence of a finite surface tension and the validity
of Laplace's law. Our results are compared with similar simulations which have
been performed previously using molecular dynamics, lattice-gas and
lattice-Boltzmann automata, and Langevin dynamics. We conclude that dissipative
particle dynamics is a promising method for simulating fluid properties in such
systems.Comment: RevTeX; 22 pages, 5 low-resolution figures. For full-resolution
figures, connect to http://www.tcm.phy.cam.ac.uk/~ken21/tension/tension.htm
Using Dissipative Particle Dynamics To Model Binary Immiscible Fluids
This paper looks at domain growth and phase separation in two-dimensional, binary, immiscible fluids using a new simulation technique called dissipative particle dynamics (DPD). We will find that the method can handle domain growth both qualitatively and quantitatively, yielding the correct scaling exponents and displaying a surface tension satisfying Laplace's law