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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale simulation of fluids: coupling molecular and continuum.

Edward R Smith1, Panagiotis E Theodorakis2

  • 1Department of Mechanical and Aerospace Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK. Edward.Smith@brunel.ac.uk.

Physical Chemistry Chemical Physics : PCCP
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Summary
This summary is machine-generated.

Coupling molecular dynamics (MD) and computational fluid dynamics (CFD) simulations bridges scale limitations. This multiscale approach integrates molecular detail where needed, enabling larger-scale fluid simulations.

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Area of Science:

  • Multiscale modeling
  • Computational science
  • Fluid dynamics

Background:

  • Computer simulations are crucial for scientific progress, but individual methods like molecular dynamics (MD) and computational fluid dynamics (CFD) have scale and assumption limitations.
  • MD simulations are limited in length and time scales, while CFD relies on assumptions like the continuum hypothesis and closure relations.

Purpose of the Study:

  • To provide a perspective on multiscale simulation by coupling MD and CFD within the same domain.
  • To enable molecular detail in specific regions while using CFD for larger scales.
  • To unify the literature on MD-CFD coupling, highlighting state and flux coupling types.

Main Methods:

  • Coupling molecular dynamics (MD) and computational fluid dynamics (CFD) simulations.
  • Implementing a multiscale approach where MD provides molecular detail in localized regions.
  • Analyzing state and flux coupling methodologies and their associated assumptions.

Main Results:

  • Demonstrated that coupling MD and CFD allows for the inclusion of molecular detail where necessary, extending the scale accessible by CFD.
  • Presented a unified view of MD-CFD coupling, distinguishing between state and flux coupling.
  • Identified challenges in obtaining averages and constraining local molecular simulations, noting errors from incorrect localization in existing literature.

Conclusions:

  • Multiscale simulation by coupling MD and CFD offers a powerful approach to overcome individual method limitations.
  • Careful consideration of localization is crucial for accurate multiscale simulations.
  • This integrated approach has broad applications, particularly in fluid simulations, and warrants further research.