8,280 research outputs found
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.
Relativistic hydrodynamics in heavy-ion collisions: general aspects and recent developments
Relativistic hydrodynamics has been quite successful in explaining the
collective behaviour of the QCD matter produced in high energy heavy-ion
collisions at RHIC and LHC. We briefly review the latest developments in the
hydrodynamical modeling of relativistic heavy-ion collisions. Essential
ingredients of the model such as the hydrodynamic evolution equations,
dissipation, initial conditions, equation of state, and freeze-out process are
reviewed. We discuss observable quantities such as particle spectra and
anisotropic flow and effect of viscosity on these observables. Recent
developments such as event-by-event fluctuations, flow in small systems
(proton-proton and proton-nucleus collisions), flow in ultra central
collisions, longitudinal fluctuations and correlations and flow in intense
magnetic field are also discussed.Comment: 36 pages, 16 figures, invited review, published versio
Modelling the Interfacial Flow of Two Immiscible Liquids in Mixing Processes
This paper presents an interface tracking method for modelling the flow of immiscible metallic liquids in mixing processes. The methodology can provide an insight into mixing processes for studying the fundamental morphology development mechanisms for immiscible interfaces. The volume-of-fluid (VOF) method is adopted in the present study, following a review of various modelling approaches for immiscible fluid systems. The VOF method employed here utilises the piecewise linear for interface construction scheme as well as the continuum surface force algorithm for surface force modelling. A model coupling numerical and experimental data is established. The main flow features in the mixing process are investigated. It is observed that the mixing of immiscible metallic liquids is strongly influenced by the viscosity of the system, shear forces and turbulence. The numerical results show good qualitative agreement with experimental results, and are useful for optimisating the design of mixing casting processes
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