DSMC modeling of near-continuum flows

Ye.A. BondarInstitute of Theoretical and Applied Mechanics, Novosibirsk 630090, RussiaThe recent activity of Computational Aerodynamics Lab (ITAM, Novosibirsk, Russia) on statistical simulation of high-temperature near-continuum rarefied flows is reviewed. An accurate prediction of these flows, such as those behind the shock wave formed about a space vehicle at high altitudes, requires the use of adequate models of physical and chemical processes - so-called real gas effects, and effective numerical procedures. Current challenges and problems pertaining to the development, validation and application of such models are discussed. A novel approach to statistical simulation of high-temperature nonequilibrium chemical reactions is described. Vibrationally specific dissociation cross sections are found as solutions of an integral equation whose right side contains a two-temperature reaction rate constant. The approach is illustrated by an example of the model of high-temperature dissociation of nitrogen. All stages of model implementation are considered in detail, namely, the mathematical basis, analysis of the model by comparisons with conventional models both at the level of cross sections and at the level of macroscopic reaction rates, and particular applications to computations of near-continuum reacting flows by the Direct Simulation Monte Carlo method.

Location: Laufer Library, RRB 207

Audiences: Everyone Is Invited

Contact: April Mundy