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Stochastic Modeling Of Turbulent Reacting Flows, Rodney O. Fox, J. C. Hill, F. Gao, R. D. Moser, M. M. Rogers
Stochastic Modeling Of Turbulent Reacting Flows, Rodney O. Fox, J. C. Hill, F. Gao, R. D. Moser, M. M. Rogers
Rodney O. Fox
Direct numerical simulations of a single-step irreversible chemical reaction with non-premixed reactants in forced isotropic turbulence at Rx = 63, Da = 4.0, and Sc = 0.7 were made using 128 Fourier modes to obtain joint pdfs and other statistical information to parameterize and test a Fokker-Planck turbulent mixing model. Preliminary results indicate that the modeled gradient stretching term for an inert scalar is independent of the initial conditions of the scalar field. The conditional pdf of scalar gradient magnitudes is found to be a function of the scalar until the reaction is largely completed. Alignment of concentration gradients with …