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Related Experiment Video

Updated: May 14, 2026

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

Multicanonical molecular dynamics by variable-temperature thermostats and variable-pressure barostats.

Cheng Zhang¹, Michael W Deem

¹Applied Physics Program, Rice University, Houston, Texas 77005, USA.

The Journal of Chemical Physics

|January 25, 2013

Summary

New molecular dynamics methods help equilibrate complex systems by sampling flat energy distributions. These adaptive thermostats and barostats efficiently manage systems with high energy barriers.

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Area of Science:

Computational chemistry
Statistical mechanics

Background:

Equilibrating complex systems with large energy barriers is challenging.
Flat energy or density distributions are beneficial for system equilibration.

Purpose of the Study:

To present novel thermostats and barostats for sampling flat distributions.
To enhance molecular dynamics simulations of complex systems.

Main Methods:

Development of adaptive thermostats and barostats.
On-the-fly updating of temperature and pressure in thermodynamic controllers.
Application to Lennard-Jones systems and protein models.

Main Results:

Demonstrated utility of presented methods for sampling flat distributions.
Successful equilibration of systems with significant energy barriers.
Validation on both simple and complex biological models.

Conclusions:

The novel thermostats and barostats effectively sample flat distributions.
These methods improve the equilibration of complex molecular systems.
The approach is broadly applicable to molecular dynamics simulations.