Lattice Boltzmann model for combustion and detonation

Abstract

In this paper we present a lattice Boltzmann model for combustion and detonation. In this model the fluid behavior is described by a finite-difference lattice Boltzmann model by Gan et al. [Physica A, 2008, 387: 1721]. The chemical reaction is described by the Lee-Tarver model [Phys. Fluids, 1980, 23: 2362]. The reaction heat is naturally coupled with the flow behavior. Due to the separation of time scales in the chemical and thermodynamic processes, a key technique for a successful simulation is to use the operator-splitting scheme. The new model is verified and validated by well-known benchmark tests. As a specific application of the new model, we studied the simple steady detonation phenomenon. To show the merit of LB model over the traditional ones, we focus on the reaction zone to study the non-equilibrium effects. It is interesting to find that, at the von Neumann peak, the system is nearly in its thermodynamic equilibrium. At the two sides of the von Neumann peak, the system deviates from its equilibrium in opposite directions. In the front of von Neumann peak, due to the strong compression from the reaction product behind the von Neumann peak, the system experiences a sudden deviation from thermodynamic equilibrium. Behind the von Neumann peak, the release of chemical energy results in thermal expansion of the matter within the reaction zone, which drives the system to deviate the thermodynamic equilibrium in the opposite direction. From the deviation from thermodynamic equilibrium, defined in this paper, one can understand more on the macroscopic effects of the system due to the deviation from its thermodynamic equilibrium.

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• Advances in the kinetics of heat and mass transfer in near-continuous complex flows
• Morphological and non-equilibrium analysis of coupled Rayleigh-Taylor-Kelvin-Helmholtz instability
• Consistent lattice Boltzmann model for multicomponent mixtures
• Polar coordinate lattice Boltzmann kinetic modeling of detonation phenomena
• Kinetic modeling of multiphase flow based on simplified Enskog equation
• Complex fields in heterogeneous materials under shock: modeling, simulation and analysis
• Discrete Boltzmann Modeling of Plasma Shock Wave
• Nonequilibrium effects of reactive flow based on gas kinetic theory
• Detonation modeling with the Particles on Demand method
• A One-Dimensional Discrete Boltzmann Model for Detonation and an Abnormal Detonation Phenomenon