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Dynamic regimes of fluids simulated by multiparticle-collision dynamics.

M Ripoll1, K Mussawisade, R G Winkler

  • 1Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

This study reveals two fluid dynamics regimes in mesoscopic simulations. Deviations from theory in the collective regime highlight the importance of hydrodynamic correlations for accurate modeling.

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Area of Science:

  • Fluid dynamics
  • Computational physics
  • Colloid science

Background:

  • Mesoscopic solvent models offer a bridge between microscopic and macroscopic fluid descriptions.
  • Understanding hydrodynamic properties is crucial for predicting transport phenomena in complex fluids.
  • The Schmidt number is a key parameter characterizing the interplay of viscous and diffusive transport.

Purpose of the Study:

  • To investigate the hydrodynamic properties of a fluid using a mesoscopic solvent model.
  • To analyze deviations from analytical predictions in different dynamic regimes.
  • To extend the model for simulating self-diffusion in colloidal dispersions.

Main Methods:

  • Mesoscopic fluid simulation with a focus on hydrodynamic properties.

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  • Characterization of fluid behavior using the Schmidt number.
  • Analysis of tracer diffusion coefficients and deviations from molecular-chaos assumptions.
  • Extension of the model to include colloidal particles and excluded-volume interactions.

    • Main Results:

    • Identification of two distinct regimes: particle (gas-like) and collective (fluid-like) dynamics.
    • Analytical expressions for tracer diffusion coefficients accurately describe the particle regime.
    • Significant deviations observed in the collective regime attributed to hydrodynamic correlations.
    • Successful simulation of self-diffusion in colloidal dispersions, showing good agreement with theoretical predictions in the collective regime.

    Conclusions:

    • Mesoscopic solvent models reveal distinct hydrodynamic regimes with varying transport characteristics.
    • Hydrodynamic correlations play a critical role in the collective regime, necessitating advanced theoretical treatments.
    • The extended model provides a robust framework for studying self-diffusion in colloidal systems.