Dissipative particle dynamics with reactions: Application to RDX decomposition
Abstract
We present a general, flexible framework for a constant-energy variant of the dissipative particle dynamics method that allows chemical reactions (DPD-RX). In our DPD-RX approach, reaction progress variables are assigned to each particle that monitor the time evolution of an extent-of-reaction associated with the prescribed reaction mechanisms and kinetics assumed to occur within the particle, where chemistry can be modeled using complex or reduced reaction mechanisms. We demonstrate our DPD-RX method by considering thermally initiated unimolecular decomposition of the energetic material, cyclotrimethylene trinitramine (RDX), into a molecular gas mixture. Studies are performed to demonstrate the effect of a spatially averaged particle internal temperature and a local reaction volume term in the chemical kinetics expressions, where both provide implicit mechanisms for capturing condensed phase reactivity. We also present an analysis of the expansion of the product gas mixture during decomposition. Finally, a discussion of other potential applications and extensions of the DPD-RX method is given.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 19, 2019
- Source ID
- 10.1063/1.5117904
Entities
People
- Igor V Schweigert
- James P Larentzos
- John K Brennan
- Martin Lísal
- Michael S. Sellers
Organizations
- Office of Naval Research
- United States Army Combat Capabilities Development Command
- United States Naval Research Laboratory