Method of invariant grid for model reduction of hydrogen combustion

Chiavazzo, Eliodoro, Karlin, Iliya V., Frouzakis, Christos E. and Boulouchos, Konstantinos (2009) Method of invariant grid for model reduction of hydrogen combustion. Proceedings of the Combustion Institute, 32 (1), 519-526. (doi:10.1016/j.proci.2008.05.014).

Abstract

The Method of Invariant Grid (MIG) is a model reduction technique based on the concept of slow
invariant manifold (SIM). The MIG approximates the SIM by a set of nodes in the concentration space
(invariant grid). In the present work, the MIG is applied to a realistic combustion system: an adiabatic
constant volume reactor with H2–air at stoichiometric proportions. By considering the thermodynamic
Lyapunov function of the detailed kinetic system, the notion of the quasi-equilibrium manifold (QEM)
is adopted as an initial approximation to the SIM. One- and two-dimensional discrete approximations
of the QEM (quasi-equilibrium grids) are constructed and refined via MIG to obtain the corresponding
invariant grids. The invariant grids are tabulated and used to integrate the reduced system. Excellent agreement
between the reduced and detailed kinetics is demonstrated.

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