Turbulent scalar fluxes from a generalized Langevin model: Implications on mean scalar mixing and tracer particle dispersion

Abstract

A Generalized Langevin Model (GLM) formulation to be used in transported joint velocity-scalar probability density function (PDF) methods is recalled in order to imply a turbulent scalar-flux model where the pressure-scrambling term is in correspondence with the standard Monin's return-to-isotropy term. The proposed non-constant C 0 formulation is extended to seen-velocity models for particle dispersion modeling in dispersed two-phase flows. This allows to correct the wrong turbulent scalar-flux modeling in the limit of tracer particles. Moreover, this allows to have a more general formulation in order to consider advanced Reynolds-stress models. The cubic model of Fu, Launder and Tselepidakis is considered, together with the model of Merci and Dick for turbulent dissipation. Results are presented for different swirling and recirculating single-phase and two-phase flows, showing the capabilities of the proposed non-constant C 0 GLM formulations compared to the standard GLM.

Edward E. O'Brien contributions to reactive-flow turbulence

“…This enthusiastic response is another indication of the respect Ted O'Brien has within the international research community of turbulence and reactive flows. These contributions are on diverse topics including combustion instability, 150,151 scalar mixing, [152][153][154][155][156] homogeneous isotropic turbulence, [157][158][159][160] turbulent premixed flames, [161][162][163][164][165][166][167][168][169][170][171] turbulent non-premixed flames, [172][173][174][175] wallbounded turbulence, [176][177][178] turbulent combustion modeling, [179][180][181] FDF/PDF, [182][183][184][185][186][187][188][189][190][191][192] and two-phase turbulent flows. [193][194][195][196]<...…”