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Title: Incorporation of memory effects in coarse-grained modeling via the Mori-Zwanzig formalism

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4935490· OSTI ID:1565466

The Mori-Zwanzig formalism for coarse-graining a complex dynamical system typically presents memory effects. The Markovian assumption of delta-correlated fluctuating forces is often employed to simplify the formulation of coarse-grained (CG) models and numerical implementations. Yet, when the time scales of a system are not clearly separated, the memory effects become strong and the Markovian assumption becomes inaccurate. To this end, we incorporate memory effects into CG modeling by preserving non-Markovian interactions between CG variables, and the memory kernel is evaluated directly from microscopic dynamics. For a specific example, molecular dynamics (MD) simulations of star polymer melts are performed while the corresponding CG system is defined by grouping many bonded atoms into single clusters. Then, the effective interactions between CG clusters as well as the memory kernel are obtained from the MD simulations. The constructed CG force field with a memory kernel leads to a non-Markovian dissipative particle dynamics (NM-DPD). Quantitative comparisons between the CG models with Markovian and non-Markovian approximations indicate that including the memory effects using NM-DPD yields similar results as the Markovian-based DPD if the system has clear time scale separation. In contrast, for systems with small separation of time scales, NM-DPD can reproduce correct short-time properties that are related to how the system responds to high-frequency disturbances, which cannot be captured by the Markovian-based DPD model.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
OSTI ID:
1565466
Alternate ID(s):
OSTI ID: 1225984
Journal Information:
Journal of Chemical Physics, Vol. 143, Issue 24; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 90 works
Citation information provided by
Web of Science

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A note on hydrodynamics from dissipative particle dynamics journal December 2017
Generalized Langevin dynamics: construction and numerical integration of non-Markovian particle-based models journal January 2018
Generalised dissipative particle dynamics with energy conservation: density- and temperature-dependent potentials journal January 2019
Numerical approximation and fast evaluation of the overdamped generalized Langevin equation with fractional noise journal February 2020
A comparative study of coarse-graining methods for polymeric fluids: Mori-Zwanzig vs. iterative Boltzmann inversion vs. stochastic parametric optimization journal July 2016
The relative entropy is fundamental to adaptive resolution simulations journal July 2016
Computing the non-Markovian coarse-grained interactions derived from the Mori–Zwanzig formalism in molecular systems: Application to polymer melts journal January 2017
Adaptive resolution simulations coupling atomistic water to dissipative particle dynamics journal September 2017
Memory-induced acceleration and slowdown of barrier crossing journal January 2018
Mesoscopic coarse-grained representations of fluids rigorously derived from atomistic models journal July 2018
The multi-dimensional generalized Langevin equation for conformational motion of proteins journal May 2019
Bottom-up approach to represent dynamic properties in coarse-grained molecular simulations journal December 2018
Data-driven parameterization of the generalized Langevin equation journal November 2016
Atomic theory of viscoelastic response and memory effects in metallic glasses journal September 2017
Long-time persistence of hydrodynamic memory boosts microparticle transport journal October 2019
Parametrizing coarse grained models for molecular systems at equilibrium journal October 2016
Molecular Dynamics Simulation of High Density DNA Arrays journal January 2018
Recent Progress towards Chemically-Specific Coarse-Grained Simulation Models with Consistent Dynamical Properties journal August 2019
Parameterization of Coarse-Grained Molecular Interactions through Potential of Mean Force Calculations and Cluster Expansion Techniques journal August 2017
Atomic theory of viscoelastic response and memory effects in metallic glasses text January 2017
Long-time persistence of hydrodynamic memory boosts microparticle transport preprint June 2019
Data-driven parameterization of the generalized Langevin equation preprint January 2016
Non-Markovian Closure Models for Large Eddy Simulations using the Mori-Zwanzig Formalism text January 2016
Parameterization of Coarse-grained Molecular Interactions through Potential of Mean Force Calculations and Cluster Expansions Techniques text January 2016
Recent progress towards chemically-specific coarse-grained simulation models with consistent dynamical properties preprint January 2019