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Title: Parallel replica dynamics simulations of reactions in shock compressed liquid benzene

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5092209· OSTI ID:1544693

The study of the long-term evolution of slow chemical reactions is challenging because quantum-based reactive molecular dynamics simulation times are typically limited to hundreds of picoseconds. In this work, the extended Lagrangian Born-Oppenheimer molecular dynamics formalism is used in conjunction with parallel replica dynamics to obtain an accurate tool to describe the long-term chemical dynamics of shock-compressed benzene. Langevin dynamics has been employed at different temperatures to calculate the first reaction times in liquid benzene at pressures and temperatures consistent with its unreacted Hugoniot. Our coupled engine runs for times on the order of nanoseconds (one to two orders of magnitude longer than traditional techniques) and is capable of detecting reactions that are characterized by rates significantly slower than we could study before. At lower pressures and temperatures, we mainly observe Diels-Alder metastable reactions, whereas at higher pressures and temperatures we observe stable polymerization reactions.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001; 20170070DR
OSTI ID:
1544693
Alternate ID(s):
OSTI ID: 1529413
Report Number(s):
LA-UR-19-20743
Journal Information:
Journal of Chemical Physics, Vol. 150, Issue 24; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Exploring the Chemistry of Low‐Temperature Ignition by Pressure‐Accelerated Dynamics journal January 2020
Potential Functions and Thermodynamic Properties of UC, UN, and UH journal January 2020

Figures / Tables (8)


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