A multi-component discrete Boltzmann model for nonequilibrium reactive flows

TL;DR

This paper introduces a multi-component discrete Boltzmann model capable of accurately simulating nonequilibrium reactive flows, capturing detailed kinetic effects beyond traditional fluid dynamics, applicable to various energy and environmental processes.

Contribution

The paper develops a novel multi-component DBM that accurately models nonequilibrium reactive flows, including detailed kinetic moments, surpassing standard lattice Boltzmann models.

Findings

Accurately recovers modified Navier-Stokes equations for reacting species.

Provides detailed nonequilibrium effects and kinetic moments.

Applicable to a wide range of energy and environmental phenomena.

Abstract

We propose a multi-component discrete Boltzmann model (DBM) for premixed, nonpremixed, or partially premixed nonequilibrium reactive flows. This model is suitable for both subsonic and supersonic flows with or without chemical reaction and/or external force. A two-dimensional sixteen-velocity model is constructed for the DBM. In the hydrodynamic limit, the DBM recovers the modified Navier-Stokes equations for reacting species in a force field. Compared to standard lattice Boltzmann models, the DBM presents not only more accurate hydrodynamic quantities, but also detailed nonequilibrium effects that are essential yet long-neglected by traditional fluid dynamics. Apart from nonequilibrium terms (viscous stress and heat flux) in conventional models, specific hydrodynamic and thermodynamic nonequilibrium quantities (high order kinetic moments and their departure from equilibrium) are dynamically obtained from the DBM in a straightforward way. Due to its generality, the developed methodology is applicable to a wide range of phenomena across many energy technologies, emissions reduction, environmental protection, mining accident prevention, chemical and process industry.