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A modal decomposition-based partially stirred reactor (mPaSR) model for turbulent combustion closure: implementation details and a posteriori validation

par Pequin, Arthur ;Quadarella, Erica;Malpica Galassi, Riccardo;Iavarone, Salvatore ;Im, Hong H.G.;Parente, Alessandro
Référence Combustion and flame, 279, 114269
Publication Publié, 2025-06-17

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Résumé :

This paper investigates a turbulence-chemistry interaction model based on the Partially Stirred Reactor (PaSR)paradigm where the hypothesis of relying on an individual chemical timescale is relaxed to deal withmultiscale problems. The modal Partially Stirred Reactor (mPaSR) model relies on the Computational SingularPerturbation (CSP) theory and performs an eigen-decomposition of the Jacobian matrix of the chemical sourceterms. The CSP manifold is then corrected by modal fractions that, similarly to the cell reacting fractionof the original PaSR model, account for the individual mode timescales. The vector of the chemical sourceterms, to be returned to the computational fluid dynamics solver, acts as an aggregated contribution of thecorrected CSP modes. The predictive capabilities of the mPaSR model are demonstrated a posteriori througha series of Unsteady Reynolds-Averaged Navier–Stokes simulations of the well-documented Sandia flames.Promising results are observed at different turbulence levels making the mPaSR approach a valuable alternativeto existing turbulence-chemistry interaction models. Particular attention is given to the formation of pollutants,and accurate predictions of nitric oxide NO are obtained