Three-dimensional direct numerical simulation of soot formation and transport in a temporally evolving nonpremixed ethylene jet flame

Lignell, David O.; Chen, Jacqueline H.; Smith, Phillip J.

doi:10.1016/j.combustflame.2008.05.020

Cited by 85 publications

(52 citation statements)

References 38 publications

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“…Depending on the flow configuration, soot aggregates may lose mass due to the attack of molecular oxygen and hydroxyl radical onto the carbon. As indicated by experimental [19,20] and computational [21][22][23][24] studies, the formation and growth of soot in flames is affected strongly by turbulence, leading to 'soot-turbulence-chemistry interaction'.…”

Section: Introductionmentioning

confidence: 99%

“…It is clear that the role of DNS in the development of LES closures for soot formation in turbulent flames is invaluable and fills a large knowledge gap left by incomplete experimental databases. There exists a growing number of DNS studies of soot formation in turbulent flames [21][22][23][24]28]. Bisetti et al [21] performed a DNS of soot formation and growth in a two-dimensional turbulent non-premixed flame subject to decaying turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Advancing predictive models for particulate formation in turbulent flames via massively parallel direct numerical simulations

Bisetti

Attili

Pitsch

2014

Phil. Trans. R. Soc. A.

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Combustion of fossil fuels is likely to continue for the near future due to the growing trends in energy consumption worldwide. The increase in efficiency and the reduction of pollutant emissions from combustion devices are pivotal to achieving meaningful levels of carbon abatement as part of the ongoing climate change efforts. Computational fluid dynamics featuring adequate combustion models will play an increasingly important role in the design of more efficient and cleaner industrial burners, internal combustion engines, and combustors for stationary power generation and aircraft propulsion. Today, turbulent combustion modelling is hindered severely by the lack of data that are accurate and sufficiently complete to assess and remedy model deficiencies effectively. In particular, the formation of pollutants is a complex, nonlinear and multi-scale process characterized by the interaction of molecular and turbulent mixing with a multitude of chemical reactions with disparate time scales. The use of direct numerical simulation (DNS) featuring a state of the art description of the underlying chemistry and physical processes has contributed greatly to combustion model development in recent years. In this paper, the analysis of the intricate evolution of soot formation in turbulent flames demonstrates how DNS databases are used to illuminate relevant physico-chemical mechanisms and to identify modelling needs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advancing predictive models for particulate formation in turbulent flames via massively parallel direct numerical simulations

Bisetti

Attili

Pitsch

2014

Phil. Trans. R. Soc. A.

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“…As such, the DSM approach remains prohibitively expensive for turbulent combustion simulation. Finally, as a reasonable compromise between fidelity and computational efficiency, the method of moments (Dobbins and Mulholland 1984;Frenklach 1985;Frenklach and Harris 1987;McGraw 1997;Wright et al 2001;Frenklach 2002;Moody and Collins 2003;Lignell et al 2008;Mueller et al 2009a,b) describes the key soot variables and the size distribution information by solving for a subset of moments of the PSDF, which are transported along with the gas-phase species.…”

Section: Introductionmentioning

confidence: 99%

“…A method of moments has been utilized in DNS for various nanoparticle-related simulations over the last decade (Moody and Collins 2003;Garrick 2003, 2004), but its use in sooting flames has been limited. Lignell and coworkers (Lignell et al 2008(Lignell et al , 2009) conducted DNS of turbulent nonpremixed sooting flames using the method of moments with logarithmic interpolative closure, employing a semi-empirical soot chemistry description. More recently, a method based on bivariate moment variables Mueller et al 2009a) has been developed and implemented in DNS (Bisetti et al 2009(Bisetti et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

Development of High Fidelity Soot Aerosol Dynamics Models using Method of Moments with Interpolative Closure

Roy

Arias

Lecoustre

et al. 2014

Aerosol Science and Technology

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The method of moments with interpolative closure (MOMIC) for soot formation and growth provides a detailed modeling framework maintaining a good balance in generality, accuracy, robustness, and computational efficiency. This study presents several computational issues in the development and implementation of the MOMIC-based soot modeling for direct numerical simulations (DNS). The issues of concern include a wide dynamic range of numbers, choice of normalization, high effective Schmidt number of soot particles, and realizability of the soot particle size distribution function (PSDF). These problems are not unique to DNS, but they are often exacerbated by the high-order numerical schemes used in DNS. Four specific issues are discussed in this article: the treatment of soot diffusion, choice of interpolation scheme for MOMIC, an approach to deal with strongly oxidizing environments, and realizability of the PSDF. General, robust, and stable approaches are sought to address these issues, minimizing the use of ad hoc treatments such as clipping. The solutions proposed and demonstrated here are being applied to generate new physical insight into complex turbulence-chemistry-soot-radiation interactions in turbulent reacting flows using DNS.

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“…These laboratory-scale laminar and turbulent flame studies can reveal important physical characteristics of fundamental combustion processes in practical devices. Recent combustion DNS studies incorporated advanced multi-physics models to describe soot formation, radiative heat transfer, and spray evaporation, providing temporally and spatially resolved combustion events with detailed information of turbulence-flame interaction characteristics [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Direct Numerical Simulation of Non-Premixed Flame Extinction by Water Spray

Arias

Narayanan

et al. 2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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The interaction of turbulent nonpremixed flames with fine water spray is studied using direct numerical simulations (DNS) with detailed chemistry. The study is of practical importance in fire safety devices that operate in the mist regime, as well as an inexpensive temperature control mechanism for gas turbines. The implemented computational methods for the Lagrangian particle-in-cell spray droplet representation and modified characteristic boundary conditions for spray-laden reacting flows are briefly described. The model configuration is a two dimensional ethylene-air counterflow diffusion flame at moderate strain rate. Laminar and turbulent flame simulations are performed with various water loading conditions. Comparison of various simulation cases highlights the flame weakening characteristics due to fluid dynamic strain and water spray evaporation. A modified mixture fraction variable defined in our earlier study [1] is applied to provide correct physical description of the flame response by accurately capturing the flame locations. Findings from this study provide a better understanding of interaction between thermal and aerodynamic quenching in turbulent flame dynamics.

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Three-dimensional direct numerical simulation of soot formation and transport in a temporally evolving nonpremixed ethylene jet flame

Cited by 85 publications

References 38 publications

Advancing predictive models for particulate formation in turbulent flames via massively parallel direct numerical simulations

Advancing predictive models for particulate formation in turbulent flames via massively parallel direct numerical simulations

Development of High Fidelity Soot Aerosol Dynamics Models using Method of Moments with Interpolative Closure

Direct Numerical Simulation of Non-Premixed Flame Extinction by Water Spray

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