Large-eddy simulation of fuel-air mixing in an internal combustion engine

Sone, Kazuo; Patel, Nayan; Menon, Suresh

doi:10.2514/6.2001-635

Cited by 20 publications

(13 citation statements)

References 18 publications

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“…By applying the LES approach, unsteady flow and engine cyclic variations can be resolved, while a RANS simulation averages out many cyclic phenomena. More details can be found, for example, in Sone et al 11 In this study, the k-equation SGS model 12 is implemented into the KIVA-3V code. For brevity, the governing equations and model formulation are not given here and can be found in Sone et al, 13 with more details.…”

Section: Simulation Procedures and Numerical Modelsmentioning

confidence: 99%

Numerical investigation of the effect of swirl flow in-homogeneity and stability on diesel engine combustion and emissions

Rezaei

Pischinger

Ewald³

et al. 2012

International Journal of Engine Research

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The present study is aimed at numerically investigating the effect of in-cylinder charge motion on mixture preparation, combustion and emission formation in a high-speed direct-injection diesel engine. Previous investigations have shown that different valve-lift strategies nominally lead to similar in-cylinder filling and global swirl levels. However, significant differences in engine-out emissions, especially soot emission, give rise to the assumption that the flow structure and local differences of the swirl motion distribution have a noticeable effect on emission behaviour. In this work, different swirl generation strategies applying different intake valve actuation schemes are numerically investigated by applying transient in-cylinder computational fluid dynamic simulations using both the Reynolds-averaged Navier-Stokes model and the multi-cycle large-eddy simulation approach. Two operating points within the operating range of current diesel passenger cars during federal test procedure 75 and new European driving cycles are simulated. The injection and combustion simulations of different valve strategies show that an in-homogeneity in the in-cylinder flow structure leads to a significant increase in soot emissions, and agree with the observed trends of corresponding experimental investigations.

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Section: Simulation Procedures and Numerical Modelsmentioning

confidence: 99%

Numerical investigation of the effect of swirl flow in-homogeneity and stability on diesel engine combustion and emissions

Rezaei

Pischinger

Ewald³

et al. 2012

International Journal of Engine Research

View full text Add to dashboard Cite

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“…The values of C n and C 3 are chosen to be 0.067 and 0.916 [60,61], respectively. The last term _ W s is the subgrid turbulence effects due to spray, which follows the original modelling approach used in RANS CFD.…”

Section: Scale Range Separation Space Filtering and Mathematical Formentioning

confidence: 99%

“…For a spray flow with the liquid phase described in the Lagrangian reference frame, the filtered governing equations for LES of the compressible, multiphase flow can be given as follows [60,61].…”

Section: Scale Range Separation Space Filtering and Mathematical Formentioning

confidence: 99%

See 1 more Smart Citation

Physical modelling and advanced simulations of gas–liquid two-phase jet flows in atomization and sprays

Jiang

Siamas

Jagus

et al. 2010

Progress in Energy and Combustion Science

242

117

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“…The LES-LEM approach by Menon and co-workers and McMurtry and co-workers [3,4,6,7,14,40,41,48,49,[53][54][55] represents an alternative strategy to LES closure in turbulent combustion. The Linear-eddy model, which was originally developed by Kerstein [25,14,26,27] is a one-dimensional mixing model that incorporates molecular processes (with structure) in a deterministic way, through solutions of unsteady reaction-diffusion equations, and turbulent transport stochastically through discrete stirring events.…”

Section: Introductionmentioning

confidence: 99%

A low-dimensional stochastic closure model for combustion large-eddy simulation

Cao

Echekki

2008

Journal of Turbulence

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A novel formulation for the large-eddy simulation (LES) of turbulent combustion flows is presented. The formulation is based on coupling LES equations for mass and momentum, with the corresponding 1D stochastic governing equations using the One-Dimensional Turbulence (ODT) model. ODT domains, or elements, on which fine-grained ODT simulations are implemented, are embedded in the flow to represent unresolved scalar and momentum statistics. The formulation is designed to address important coupling between turbulent transport and molecular processes (reaction and diffusion) over a wide range of length and time scales. This coupling poses difficult challenges for the LES modeling of turbulent mixing and combustion flows. The LES-ODT approach is implemented for the problem of autoignition in non-homogeneous mixtures. The LES-ODT model yields excellent agreement with direct numerical simulations (DNS) of reactive scalars' statistics at different turbulence and Lewis number conditions. Comparisons of the LES-ODT results with DNS show that the model represents adequately turbulent transport through its filtered advection and stochastic stirring. Molecular transport exhibits important roles in determining the rate of heat and mass dissipation from the autoignition kernels and their propagation. IntroductionThe state-of-the-art approaches for the large-eddy simulation (LES) of turbulent combustion may be classified under the following three categories: (1) moment methods such as the ones based on the flamelet approach [43] and the conditional moment closure (CMC) approach [34], (2) filtered mass-density function (FDF) methods [16,45], and (3) one-dimensional stochastic approaches, such as the linear-eddy model (LEM) [25] and the one-dimensional turbulence (ODT) model [29]. In moment methods, reactive scalar closure for source terms or scalar moments are resolved in a reduced parameter space; moments for these parameters are transported within the context of the LES governing equations. Important limitations have already been recognised for moment approaches as related to the adequacy of a limited number of moments to predict non-equilibrium effects, such as extinction and reignition, the

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Large-eddy simulation of fuel-air mixing in an internal combustion engine

Cited by 20 publications

References 18 publications

Numerical investigation of the effect of swirl flow in-homogeneity and stability on diesel engine combustion and emissions

Numerical investigation of the effect of swirl flow in-homogeneity and stability on diesel engine combustion and emissions

Physical modelling and advanced simulations of gas–liquid two-phase jet flows in atomization and sprays

A low-dimensional stochastic closure model for combustion large-eddy simulation

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