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A temperature control technique for nonequilibrium molecular simulation.

Ben Leimkuhler1, Frédéric Legoll, Emad Noorizadeh

  • 1The Maxwell Institute and School of Mathematics, University of Edinburgh, Edinburgh, UK. B.leimkuhler@ed.ac.uk

The Journal of Chemical Physics
|February 27, 2008
PubMed
Summary
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This study introduces a novel dynamical approach for thermal regulation in molecular dynamics simulations. The method accurately controls temperature, enabling reliable microcanonical averages and heat dissipation management in nonequilibrium systems.

Area of Science:

  • Computational Physics
  • Chemical Physics
  • Thermodynamics

Background:

  • Accurate temperature control is crucial for molecular dynamics (MD) simulations.
  • Existing methods like Nose dynamics have limitations in certain scenarios.
  • Simulating heat dissipation in nonequilibrium systems requires precise thermal management.

Purpose of the Study:

  • To develop a new dynamical approach for thermal regulation in MD.
  • To enable the approximation of microcanonical averages and autocorrelation functions.
  • To demonstrate effective control of heat dissipation in nonequilibrium simulations.

Main Methods:

  • A dynamical approach using a control law and an auxiliary variable.
  • The influence of the auxiliary variable diminishes as the system approaches equilibrium.

Related Experiment Videos

  • Application to control heat introduced by rapid system changes and study vibrational relaxation.

    • Main Results:

    • The proposed method allows for approximation of microcanonical averages.
    • Autocorrelation functions consistent with a target temperature are achievable.
    • Effective regulation of heat dissipation was demonstrated in nonequilibrium settings.

    Conclusions:

    • The novel dynamical approach provides accurate thermal regulation in MD.
    • The technique is suitable for approximating equilibrium properties.
    • It offers a robust method for managing heat flow in complex simulations.