Computational investigation of chemical and non-equilibrium effects on the Richtmyer–Meshkov instability
Journal
Proceedings of the Combustion Institute
Journal Volume
40
Journal Issue
1-4
Start Page
105335
ISSN
1540-7489
Date Issued
2024-01
Author(s)
Chi-Ho Chou
DOI
10.1016/j.proci.2024.105335
Abstract
In order to study the reactive Richtmyer–Meshkov instability (RMI) at a microscale, we have implemented a direct simulation Monte Carlo (DSMC) method which is recently developed for resolving thermal–chemical processes at the scale of molecular motions. The method allows efficient simulations of polyatomic reactions and non-equilibrium processes without violation of the detailed balance which is generically suffered by the conventional algorithms and leads to failure of local thermal equilibrium eventually. With attainment of essential accuracy, the effects of nonequilibrium and chemical reactions on the evolution of two-dimensional (2D) RMI at the microscale are investigated. The results show that the nonequilibrium effect slows down the heat release of chemical reactions and strengthens the viscous and diffusive effects for the mixture and shock conditions tested, which inhibit the growth of the RM instability. The heat release via combustion, however, can substantially increase the RMI growth due to induced baroclinic torque. Consequently, the intricate coupling of these effects nonlinearly dominates the development of RMI at the microscale. Therefore, the influence of nonequilibrium conditions where the translational energy is higher than that of the internal modes of polyatomic molecules, specifically the vibrational energy, in the post-shock region should be considered. The procedure provides a paradigm for further research in pursuit of accurate evaluation of microscopic processes and the resulted performance in supersonic combustion that plays a key role in the development of hypersonic vehicles.
Subjects
Direct simulation Monte Carlo
Non-equilibrium
Quantum kinetic model
Shock
Supersonic combustion
SDGs
Publisher
Elsevier BV
Type
journal article