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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
Published on: September 17, 2021
Recent progress in adaptive multiscale molecular dynamics simulations of soft matter
Steven O Nielsen1, Rosa E Bulo, Preston B Moore
1Department of Chemistry, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080, USA.
Physical Chemistry Chemical Physics : PCCP
|August 25, 2010
Summary
Adaptive hybrid simulations enable multiscale molecular dynamics by seamlessly integrating different simulation resolutions. This approach effectively bridges microscopic and mesoscopic scales for complex soft matter systems.
Area of Science:
- Computational Chemistry
- Materials Science
- Biophysics
Background:
- Simulating mesoscopic phenomena requires bridging microscopic atomic/electronic motions with larger scales.
- Multiscale modeling combines different theories to describe systems across various resolutions.
- Adaptive hybrid simulations use distinct spatial domains with dynamic resolution changes.
Purpose of the Study:
- Review advancements in adaptive hybrid molecular dynamics simulations.
- Discuss the methodology and challenges of simulating systems with adaptive resolution.
- Present efficient adaptive hybrid quantum mechanics/molecular mechanics (QM/MM) and atomistic/coarse grain (AA/CG) methods.
Main Methods:
- Utilize adaptive hybrid simulations with separate spatial domains and matter diffusion.
- Employ a 'healing region' for smooth coupling between different resolution domains.
- Formulate coupling using native forces, conserving energy with auxiliary terms.
- Implement error control and time step selection via energy flow analysis.
- Resolve coarse grain to atomistic (CG → AA) reverse mapping using rigid atomistic fragments and rotational dynamics.
Main Results:
- Demonstrated efficient adaptive hybrid QM/MM and AA/CG molecular dynamics methods.
- Developed a smooth coupling strategy using a healing region and native forces.
- Established energy conservation through auxiliary bookkeeping terms.
- Showcased a robust CG → AA reverse mapping solution for adaptive simulations.
- Enabled adaptive hybrid multiscale molecular dynamics for macromolecular soft matter.
Conclusions:
- Adaptive hybrid simulations offer a powerful approach to bridge simulation scales.
- The presented methods facilitate seamless resolution changes and accurate energy conservation.
- These advancements pave the way for simulating complex soft matter systems with unprecedented detail.
