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Controlling density fluctuations in wall-bounded dissipative particle dynamics systems.

Igor V Pivkin1, George Em Karniadakis

  • 1Division of Applied Mathematics, Brown University, Providence, Rhode Island 02912, USA. piv@dam.brown.edu

Physical Review Letters
|June 29, 2006
PubMed
Summary

Dissipative Particle Dynamics (DPD) simulations can show density fluctuations near walls. An adaptive model is introduced to eliminate these oscillations and control density profiles in coarse-grained simulations.

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Area of Science:

  • Computational fluid dynamics
  • Materials science
  • Statistical mechanics

Background:

  • Dissipative Particle Dynamics (DPD) simulations of wall-bounded flows often show density fluctuations.
  • These fluctuations are linked to the no-slip boundary condition and increase with coarse-graining levels.

Purpose of the Study:

  • To develop an adaptive model for wall-particle interactions in DPD simulations.
  • To eliminate density oscillations and enable targeting of specific density profiles.

Main Methods:

  • Developed an adaptive model for wall-particle interactions.
  • Compared simulation results with ideal no-slip boundary conditions.
  • Validated against molecular dynamics simulations.

Main Results:

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  • The adaptive model successfully eliminates density fluctuations near walls.
  • The model allows for precise control over density profiles.
  • Demonstrated agreement with molecular dynamics simulations.

Conclusions:

  • The new adaptive wall-particle interaction model enhances the accuracy of DPD simulations for wall-bounded flows.
  • This generalizable model can be applied to various coarse-grained particle methods.