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Finite-size effects in dissipative particle dynamics simulations.

María Eugenia Velázquez1, Armando Gama-Goicochea, Minerva González-Melchor

  • 1Centro de Investigación en Polímeros, Marcos Achar Lobatón No. 2, Tepexpan, 55885 Acolman, Estado de México, Mexico.

The Journal of Chemical Physics
|March 4, 2006
PubMed
Summary

Finite system size affects stress anisotropy and interfacial tension in simulations. Dissipative particle dynamics (DPD) simulations show reliable interfacial tension results with repulsive forces in small systems.

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Area of Science:

  • Computational physics
  • Materials science
  • Statistical mechanics

Background:

  • Finite-size effects can influence simulation results, impacting the accuracy of macroscopic properties.
  • Understanding these effects is crucial for reliable computational modeling of materials.

Purpose of the Study:

  • To investigate the impact of finite transversal area on stress anisotropy and interfacial tension using simulations.
  • To determine conditions for obtaining reliable interfacial tension results from Dissipative Particle Dynamics (DPD) simulations.

Main Methods:

  • Dissipative Particle Dynamics (DPD) simulations were employed.
  • Simulations were conducted in both single-phase and two-phase systems within parallelepiped cells.
  • Monte Carlo (MC) simulations at constant temperature and pressure were also used for comparison.

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Main Results:

  • In single-phase simulations with repulsive forces, no finite-size effect on stress anisotropy was observed.
  • Attractive-repulsive interactions led to oscillatory stress anisotropy.
  • Liquid-liquid interfaces with repulsive interactions showed minimal surface area effects on interfacial tension in MC simulations.
  • Canonical ensemble simulations exhibited significant, artificial finite-size effects on surface tension.

Conclusions:

  • Reliable interfacial tension values from DPD simulations can be achieved with systems containing fewer than 2000 particles, provided they interact solely through repulsive forces.
  • Care must be taken when interpreting results from simulations in the canonical ensemble due to artificial finite-size effects.