Simulations of spray autoignition and flame establishment with two-dimensional CMC

Wright, Yuri M.; Paola, G. De; Boulouchos, Konstantinos; Mastorakos, Epaminondas

doi:10.1016/j.combustflame.2005.08.022

Cited by 117 publications

(81 citation statements)

References 45 publications

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“…To incorporate the liquid-phase fuel spray, a Lagrangian approach was used with the blob model for atomization and the Reitz-Diwakar [27] model for droplet secondary breakup. Turbulence-chemistry interaction was accounted for by the conditional moment closure (CMC) approach, previously applied for simulation of various high-pressure spray test rigs [28,29,30,31,32]. For soot modeling, the semi-empirical two-equation model of Leung et al [33] was employed within the CMC framework.…”

Section: Eth Zurich Switzerland (Ethz)mentioning

confidence: 99%

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Skeen

Manin

Pickett

et al. 2016

SAE Int. J. Engines

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The 4th Workshop of the Engine Combustion Network (ECN) was held September 5-6, 2015 in Kyoto, Japan. This manuscript presents a summary of the progress in experiments and modeling among ECN contributors leading to a better understanding of soot formation under the ECN “Spray A” configuration and some parametric variants. Relevant published and unpublished work from prior ECN workshops is reviewed. Experiments measuring soot particle size and morphology, soot volume fraction (fv), and transient soot mass have been conducted at various international institutions providing target data for improvements to computational models. Multiple modeling contributions using both the Reynolds Averaged Navier-Stokes (RANS) Equations approach and the Large-Eddy Simulation (LES) approach have been submitted. Among these, various chemical mechanisms, soot models, and turbulence-chemistry interaction (TCI) methodologies have been considered

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Section: Eth Zurich Switzerland (Ethz)mentioning

confidence: 99%

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Skeen

Manin

Pickett

et al. 2016

SAE Int. J. Engines

View full text Add to dashboard Cite

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“…This is justified by the weaker spatial dependence of conditional quantities [16]. This implies that averaging is applied to transfer the flow-field information from the LES resolution to the CMC resolution.…”

Section: Conditional Moment Closurementioning

confidence: 99%

“…The first term on the left-hand side of equation (10) Additionally to the solution of the transport equations for the conditional mean species mass fractions, the transport equation for the conditional mean temperature is solved, ignoring radiation and pressure work [16]:…”

Section: Conditional Moment Closurementioning

confidence: 99%

Simulation of Hydrogen Auto-Ignition in a Turbulent Co-flow of Heated Air with LES and CMC Approach

Stanković

Triantafyllidis

Mastorakos

et al. 2010

Flow Turbulence Combust

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“…This requires a simplified 1D, 2D or coarse 3D mesh of the studied geometrical domain, and suitable mapping techniques to interpolate computed solution on the real mesh. CMC model is very powerful, but computationally very demanding due to the need to solve flamelet equations directly in the CFD domain [15,16]. For this reason its application is limited to small chemical mechanisms operating only with simplified surrogate fuels, like n-heptane [17].…”

Section: Introductionmentioning

confidence: 99%

Towards the Use of Eulerian Field PDF Methods for Combustion Modeling in IC Engines

Lucchini¹,

D’Errico²,

Contino

et al. 2014

SAE Int. J. Engines

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Dear session organizers, authors thanks the reviewers for the very useful suggestion and comments to include the quality of the paper. The text was modified accordingly and changed parts were highlighted with the red color. A detailed response to reviewer comments follows. Response to Reviewer 1 Stochastic Eulerian field PDF methods are combined with a combination of acceleration strategies to reduce the computational cost associated with the use of large chemical mechanisms in CFD.The resulting model is used to simulate autoignition in a high-pressure turbulent spray combustion vessel under diesel-engine-like conditions. While the individual methods are not new, the combination of methods and their application to autoignition for enginerelevant conditions is novel, and would be of interest to the SAE audience. This is an approach that has significant potential for accurately capturing effects of turbulence-chemistry interaction over a wide range of engine operating conditions.Authors thanks the reviewer for the comments. The proposed combustion model based on Eulerian Stochastic fields will be continuosly developed and applied soon to more realistic engine studies. The title of the paper "Towards the Use of Eulerian Field PDF Methods for Combustion Modeling in IC Engines" should clearly indicate that this is a first attempt to apply what is considered by the combustion community to be one of the most complex and realistic models currently available to predict flame propagation. Presentation of preliminary results and discussion about them within the SAE world congress toghether with the major experts of the engine combustion community represents, to the authors' opinion, one of the best ways to understand the main advantages and drawbacks of such model and to find proper ways to improve it. For this reason, authors do not think this work is incomplete but it represents an important step towards the adoption of advanced models to predict combustion in IC engines. This reviewer's comment is not completely clear to the authors. The first sentence is just a general consideration, while the last one clearly states that this is just a preliminary work and for this reason further validation is required. For what concerns the model description, in this work it was not possible to include all the complete details about 1 how stochastic combustion models and related processes work. We recommend the reviewer to look at references [21][22][23][24][25][26][27][28] for further information. Eq. 1 illustrate the generic formulation of a transport equation for the joint pdf function inside the computational domain. Such equation is too complex to be solved directly (it is a transport equation for a function and not a scalar or vector field) and for this reason it is solved either with the help of Lagrangian particles (Lagrangian PDF methods) or by using Stochastic fields. The statement "summation is implied ..." is referred to divergence terms appearing in Eq. 1 and other transport equations included in this work as well. The W...

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Simulations of spray autoignition and flame establishment with two-dimensional CMC

Cited by 117 publications

References 45 publications

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Simulation of Hydrogen Auto-Ignition in a Turbulent Co-flow of Heated Air with LES and CMC Approach

Towards the Use of Eulerian Field PDF Methods for Combustion Modeling in IC Engines

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