602 research outputs found
Dynamical Study of Polydisperse Hard-Sphere System
We study the interplay between the fluid-crystal transition and the glass
transition of elastic sphere system with polydispersity using nonequilibrium
molecular dynamics simulations. It is found that the end point of the
crystal-fluid transition line, which corresponds to the critical polydispersity
above which the crystal state is unstable, is on the glass transition line.
This means that crystal and fluid states at the melting point becomes less
distinguishable as polydispersity increases and finally they become identical
state, i.e., marginal glass state, at critical polydispersity.Comment: 5 pages, 5 figure
Static and dynamical aspects of the metastable states of first order transition systems
We numerically study the metastable states of the 2d Potts model. Both of
equilibrium and relaxation properties are investigated focusing on the finite
size effect. The former is investigated by finding the free energy extremal
point by the Wang-Landau sampling and the latter is done by observing the
Metropolis dynamics after sudden heating. It is explicitly shown that with
increasing system size the equilibrium spinodal temperature approaches the
bistable temperature in a power-law and the size-dependence of the nucleation
dynamics agrees with it. In addition, we perform finite size scaling of the
free energy landscape at the bistable point.Comment: 8 pages, 6 figures, submitted to Physics Procedia as a proceedings of
the 24th Annual CSP Workshop at the University of Georgi
Molecular Dynamics Study of Rotating Nanodroplets: Finite-size Effects and Nonequilibrium Deformation
Noneqiuilibrium dynamics of rotating droplets are studied by molecular
dynamics simulations. Small deviations from the theoretical prediction are
observed when the size of a droplet is small, and the deviations become smaller
as the size of the droplet increases. The characteristic timescale of the
deformation is observed, and we find (i) the deformation timescale is almost
independent of the rotating velocity with for small frequency and (ii) the
deformation timescale becomes shorter as temperature increases. A simple model
is proposed to explain the deformation dynamics of droplets.Comment: 14 pages, 8 figure, added references, changed titl
Scalar Transfer across a Turbulent/non-turbulent Interface in a Planar Jet
This fluid dynamics video is an entry for the Gallery of Fluid Motion of the
66th Annual Meeting of the APS-DFD. In this video, the scalar transfer across
the turbulent/non-turbulent (T/NT) interface in a planar jet is investigated by
using a direct numerical simulation. Visualization of the scalar flux across
the T/NT interface shows that the diffusive species premixed in the ambient
flow is transferred into the turbulent region mainly across the leading edge
(Here, the leading edge is the T/NT interface across which the turbulent fluid
turns into the non-turbulent fluid in the streamwise direction).Comment: The fluid dynamics video for an entry for the Gallery of Fluid Motion
of the 66th Annual Meeting of the APS-DFD is include
Multilayer graphene shows intrinsic resistance peaks in the carrier density dependence
Since the advent of graphene, a variety of studies have been performed to
elucidate its fundamental physics, or to explore its practical applications.
Gate-tunable resistance is one of the most important properties of graphene and
has been studied in 1-3 layer graphene in a number of efforts to control the
band gap to obtain a large on-off ratio. On the other hand, the transport
property of multilayer graphene with more than three layers is less well
understood. Here we show a new aspect of multilayer graphene. We found that
four-layer graphene shows intrinsic peak structures in the gate voltage
dependence of its resistance at zero magnetic field. Measurement of quantum
oscillations in magnetic field confirmed that the peaks originate from the
specific band structure of graphene and appear at the carrier density for the
bottoms of conduction bands and valence bands. The intrinsic peak structures
should generally be observed in AB-stacked multilayer graphene. The present
results would be significant for understanding the physics of graphene and
making graphene FET devices
Usefulness of an equal-probability assumption for out-of-equilibrium states: a master equation approach
We examine the effectiveness of assuming an equal probability for states far
from equilibrium. For this aim, we propose a method to construct a master
equation for extensive variables describing non-stationary nonequilibrium
dynamics. The key point of the method is the assumption that transient states
are equivalent to the equilibrium state that has the same extensive variables,
i.e., an equal probability holds for microscopic states in nonequilibrium. We
demonstrate an application of this method to the critical relaxation of the
two-dimensional Potts model by Monte Carlo simulations. While the one-variable
description, which is adequate for equilibrium, yields relaxation dynamics that
are very fast, redundant two-variable description well reproduces the true
dynamics quantitatively. These results suggest that some class of the
nonequilibrium state can be described with a small extension of degrees of
freedom, which may lead to an alternative way to understand nonequilibrium
phenomena.Comment: 9 pages, 7 figure
Vorticity Evolution near the Turbulent/Non-Turbulent Interfaces in Free-Shear Flows
Vorticity dynamics is studied near the interface between turbulent and non-turbulent flows, the so-called turbulent/non-turbulent (T/NT) interface, with the direct numerical simulations of planar jets and mixing layers. The statistics near the interface confirm that the T/NT interface consists of two layers: viscous superlayer and turbulent sublayer. The viscous superlayer with the thickness of four times of Kolmogorov length scale is found at the outer edge of the interface, where the vorticity grows with the viscous diffusion. In the turbulent sublayer between the viscous superlayer and the turbulent region, the strain-vorticity interaction becomes active. In the Lagrangian statistics for the fluid particles, the different scaling laws appear in the entrained particle movement depending on the layer: a ballistic evolution in the viscous superlayer and the Richardson-like scaling for relative dispersion in the turbulent sublayer. These scalings indicate that the change in the particle position in the viscous superlayer is governed by the outward viscous diffusion of vorticity, whereas it is governed by the inviscid small-scale eddy motions in the turbulent sublayer. The flow topology on the particle path line shows that the fluid being entrained tends to circumvent the core region of intense eddies near the T/NT interface
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