High Speed Flow Chemistry Modelling

figure_newAn open source implementation of chemistry modelling for the direct simulation Monte Carlo (DSMC) method has been constructed. An approach known as the quantum kinetic (Q-K) method has been adopted to describe chemical reactions in a 5-species air model using DSMC procedures based on microscopic gas information. The Q-K technique has been implemented within the framework of the dsmcFoam code, a derivative of the open source CFD code OpenFOAM. Our results for vibrational relaxation, dissociation and exchange reaction rates for an adiabatic bath demonstrate the success of the Q-K model implementation in dsmcFoam when compared with analytical solutions for both inert and reacting conditions. A comparison has also made between the Q-K and total collision energy (TCE) chemistry approaches for a hypersonic flow benchmark case. Currently we work on model extension to cover ionization and plasma gases.

For more information about the project contact Dr Thomas Scanlon (tom.scanlon [at] strath [dot] ac [dot] uk), Senior Lecturer at the Department of Mechanical and Aerospace Engineering  at the University of Strathclyde.

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Figure 1. Contours of Nitric Oxide for hypersonic flow over a cylinder, upper half (TCE), lower half (QK).