Achieving Reproducibility and Replicability of Molecular Dynamics and Monte Carlo Simulations Using the Molecular Simulation Design Framework (MoSDeF)

NC Craven and R Singh and CD Quach and JB Gilmer and B Crawford and E Marin-Rimoldi and R Smith and R Defever and MS Dyukov and JW Fothergill and C Jones and TC Moore and BL Butler and JA Anderson and CR Iacovella and E Jankowski and EJ Maginn and JJ Potoff and SC Glotzer and PT Cummings and C Mccabe and JI Siepmann, JOURNAL OF CHEMICAL AND ENGINEERING DATA, 70, 2178-2199 (2025).

DOI: 10.1021/acs.jced.5c00010

Molecular simulations are increasingly used to predict thermophysical properties and explore molecular-level phenomena beyond modern imaging techniques. To make these tools accessible to nonexperts, several open- source molecular dynamics (MD) and Monte Carlo (MC) codes have been developed. However, using these tools is challenging, and concerns about the validity and reproducibility of the simulation data persist. In 2017, Schappals et al. reported a benchmarking study involving several research groups independently performing MD and MC simulations using different software to predict densities of alkanes using common molecular mechanics force fields . Although the predicted densities were reasonably close (mostly within 1%), the data often fell outside of the combined statistical uncertainties of the different simulations. Schappals et al. concluded that there are unavoidable errors inherent to molecular simulations once a certain degree of complexity of the system is reached. The Molecular Simulation Design Framework (MoSDeF) is a workflow package designed to achieve TRUE (Transparent, Reproducible, Usable-by-others, and Extensible) simulation studies by standardizing the implementation of molecular models for various simulation engines. This work demonstrates that using MoSDeF to initialize a simulation workflow results in consistent predictions of system density, even while increasing model complexity.

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