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Potential Due to a Polarized Object01:29

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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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On the pressure calculation for polarizable models in computer simulation.

Péter T Kiss1, András Baranyai

  • 1Institute of Chemistry, Eötvös University, 1518 Budapest 112, PO BOX 32, Hungary.

The Journal of Chemical Physics
|March 20, 2012
PubMed
Summary
This summary is machine-generated.

Calculating pressure in molecular simulations with polarizable models is possible and yields results identical to nonpolarizable models. Ensure induced dipoles reach equilibrium for accurate pressure and energy conservation in molecular dynamics or Monte Carlo simulations.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Statistical Mechanics

Background:

  • Pressure calculation in molecular simulations is crucial for understanding material properties.
  • Polarizable models offer a more accurate representation of molecular interactions.
  • Previous studies have debated pressure calculation methods for polarizable systems with periodic boundaries.

Purpose of the Study:

  • To resolve controversy regarding pressure calculation in polarizable models with periodic boundaries.
  • To systematically derive and validate pressure calculation formulas for polarizable models.
  • To investigate the impact of induced dipole convergence on pressure accuracy.

Main Methods:

  • Systematic derivation of pressure expressions for polarizable models.
  • Comparison with established pressure calculation methods for nonpolarizable models.
  • Numerical validation using a polarizable water model and exact methods.

Main Results:

  • The pressure formula for polarizable models is identical to nonpolarizable models.
  • Perfect mechanical equilibrium of induced dipoles is a strict condition for formula validity.
  • Inaccurate pressure calculations correlate with imperfect induced dipole convergence.

Conclusions:

  • The derived pressure formula is applicable to polarizable models under specific conditions.
  • Accurate pressure calculation relies on achieving mechanical equilibrium of induced dipoles.
  • Ensuring dipole convergence is vital for reliable energy conservation and pressure results in simulations.