Coupling of mixing models with manifold based simplified chemistry in PDF modeling of turbulent reacting flows

Yu, Chunkan; Breda, Paola; Pfitzner, Michael; Maas, Ulrich

doi:10.1016/j.proci.2020.06.132

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…Since the REDIM tables were built over a single reactive progress variable, it is possible that the slow chemistry, characteristic of the CO reactions, would need a second reactive progress variable for a correct description. The work of Yu et al (2020) confirmed this observation.…”

Section: Sandia Flame Dsupporting

confidence: 63%

“…This configuration is referred as 3D-REDIM from now on. A parallel investigation extended the REDIM to a second reaction progress variable instead (Yu et al 2020). In both cases a significant improvement was obtained for the prediction of the degree of local extinction.…”

Section: Sandia Flame Fmentioning

confidence: 99%

“…In turbulent flows, where models for diffusion tend to move the states off the manifold, a back-projection is needed (Bender et al 2000). In order to simplify the treatment a constant back-projection is typically used, although a certain dependence on the progress variable was observed when using a constant matrix projection (Yu et al 2020). However, an optimal choice of the REDIM progress variables can be determined a-priori, as reported in Yu et al (2019).…”

Section: Introductionmentioning

confidence: 99%

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Validation of an Eulerian Stochastic Fields Solver Coupled with Reaction–Diffusion Manifolds on LES of Methane/Air Non-premixed Flames

Breda

Maas

et al. 2020

Flow Turbulence Combust

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The Eulerian stochastic fields (ESF) combustion model can be used in LES in order to evaluate the filtered density function to describe the process of turbulence–chemistry interaction. The method is typically computationally expensive, especially if detailed chemistry mechanisms involving hydrocarbons are used. In this work, expensive computations are avoided by coupling the ESF solver with a reduced chemistry model. The reaction–diffusion manifold (REDIM) is chosen for this purpose, consisting of a passive scalar and a suitable reaction progress variable. The latter allows the use of a constant parametrization matrix when projecting the ESF equations onto the manifold. The piloted flames Sandia D–E were selected for validation using a 2D-REDIM. The results show that the combined solver is able to correctly capture the flame behavior in the investigated sections, although local extinction is underestimated by the ESF close to the injection plate. Hydrogen concentrations are strongly influenced by the transport model selected within the REDIM tabulation. A total solver performance increase by a factor of 81% is observed, compared to a full chemistry ESF simulation with 19 species. An accurate prediction of flame F instead required the extension of the REDIM table to a third variable, the scalar dissipation rate.

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Section: Sandia Flame Dsupporting

confidence: 63%

Section: Sandia Flame Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Validation of an Eulerian Stochastic Fields Solver Coupled with Reaction–Diffusion Manifolds on LES of Methane/Air Non-premixed Flames

Breda

Maas

et al. 2020

Flow Turbulence Combust

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Influence of the chemical kinetics on the prediction of turbulent non-premixed jet CH$$_4$$ flames

Yu,

Cai,

Chopra

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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The present work focuses on the five different chemical mechanisms coupled with probability density function (PDF) model to represent the local extinction and re-ignition flame characteristics of the well-known Sandia Flames D–F. These five mechanisms span from the Foundational Fuel Chemistry Model (FFCM) mechanism involving 38 species to the Glarborg mechanism involving 150 species. The coupled computational fluid dynamics (CFD) and transported-PDF method are used for the turbulence modeling, and the reaction–diffusion manifolds (REDIMs) are used as an advanced technique for the simplification of chemical kinetics and to speed up the numerical computation. It is demonstrated that these chemical mechanisms have an ability to represent the degree of local extinction and re-ignition accurately. Furthermore, the sensitivity analysis shows that the degree of local extinction is very sensitive to only several key elementary reactions, and an analysis on the turbulence–chemistry interaction investigates the influence of these elementary reactions.

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Numerical characterization of a novel test bench featuring secondary reactions of methane

Fischer¹,

Breda²,

Dalshad³

et al. 2021

Aerospace Science and Technology

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Coupling of mixing models with manifold based simplified chemistry in PDF modeling of turbulent reacting flows

Cited by 10 publications

References 24 publications

Validation of an Eulerian Stochastic Fields Solver Coupled with Reaction–Diffusion Manifolds on LES of Methane/Air Non-premixed Flames

Validation of an Eulerian Stochastic Fields Solver Coupled with Reaction–Diffusion Manifolds on LES of Methane/Air Non-premixed Flames

Influence of the chemical kinetics on the prediction of turbulent non-premixed jet CH$$_4$$ flames

Numerical characterization of a novel test bench featuring secondary reactions of methane

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