A Gas-Kinetic Scheme for Multimaterial Flows and Its Application in Chemical Reactions

✍ Scribed by Y.S. Lian; K. Xu

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 415 KB
• Volume: 163
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1006/jcph.2000.6571

✦ Synopsis

This paper concerns the extension of the multicomponent gas-kinetic BGK-type scheme to chemical reactive flow calculations. In the kinetic model, each component satisfies its individual gas-kinetic Bhatnagar-Gross-Krook (BGK) equation, and the equilibrium states of both components are coupled in space and time due to the momentum and energy exchange in the course of particle collisions. At the same time, according to the chemical reaction rule, one component can be changed into another component with a release of energy. The reactant and product may have different ratios of specific heats. The BGK scheme basically uses the collisional Boltzmann model to mimic the numerical dissipation necessary for shock capturing. The numerical dissipation is controlled by the particle collision pseudo-time τ . In the resolved viscous calculations, there is a direct relation between the physical viscosity coefficient and the particle collision time. Many numerical test cases presented in this paper validate the gas-kinetic approach in the application of multicomponent reactive flows.