Efficient 3-D CFD Combustion Modeling with Transient Flamelet Models

Lehtiniemi, Harry; Zhang, Yongzhe; Rawat, Rajesh; Mauß, Fabian

doi:10.4271/2008-01-0957

Cited by 49 publications

(42 citation statements)

References 44 publications

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“…It has 106 species and 420 reactions and it was extensively validated with constant-volume ignition delay data in a wide range of ambient conditions, including variation of pressure, ambient temperature and equivalence ratio. Preliminary results are presented in this work, in particular results from the SEF model are compared with the ones achieved by the well-mixed and mRIF model [13,14]. Both these last ones were recently implemented in the Lib-ICE code and extensively validated in [56,57] where the reader can refer for fur- ther information.…”

Section: Sandia Combustion Vesselmentioning

confidence: 99%

“…Effects of mixing are incorporated in the scalar dissipation rate, which is com-puted as a conditional average of its distribution in the CFD domain. Use of multiple flamelets ensures a better prediction of both flame structure and autoignition, since spatial variations of the scalar dissipation rate are properly taken into account [14]. The CMC model introduces a further level of detail, since flamelet equations are solved including also a term accounting for flow-field effects.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Sandia Combustion Vesselmentioning

confidence: 99%

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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“…The TFPV library is based on unsteady diffusion flame calculations performed with the TRIF model, in a similar way as done in [13,10,11] with the so-called approximated diffusion flames approach. Generation of the TFPV library is shown in Fig.…”

Section: Tabulated Flamelet Progress Variable (Tfpv)mentioning

confidence: 99%

“…After every time-step, the progress variable C is evaluated and the equivalent reactor chemical composition is computed by means of the virtual species approach [14,12]. Progress variable is defined as in [13], with C being equal to the heat released by combustion, computed as the difference between the current and the initial value of the reactor formation enthalpy, also known as h 298 :…”

Section: Chemistry Table Generationmentioning

confidence: 99%

“…Purpose of this work is the extension of the previously proposed approach for tabulated kinetics to include an additional combustion model as well as the possibility to predict NO x emissions. The model presented here, called TFPV (tabulated flamelet progress variable) was proposed in past works [10,11,13] and is based on the tabulation of laminar diffusion flamelets for different scalar dissipation rate levels. Compared to the multiple representative interactive flamelet model, TFPV is expected to perform better since it takes into account the local flow conditions and also transport of progress variable allow a more realistic description of the combustion process originated by multiple injections.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Validation of Combustion Models for Diesel Engines Based on Tabulated Kinetics in a Wide Range of Operating Conditions

Lucchini¹,

D’Errico²,

Cerri³

et al. 2017

SAE Technical Paper Series

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Computational fluid dynamics represents a useful tool to support the design and development of Heavy Duty Engines, making possible to test the effects of injection strategies and combustion chamber design for a wide range of operating conditions. Predictive models are required to ensure accurate estimations of heat release and the main pollutant emissions within a limited amount of time. For this reason, both detailed chemistry and turbulence chemistry interaction need to be included. In this work, the authors intend to apply combustion models based on tabulated kinetics for the prediction of Diesel combustion in Heavy Duty Engines. Four different approaches were considered: wellmixed model, presumed PDF, representative interactive flamelets and flamelet progress variable. Tabulated kinetics was also used for the estimation of N O x emissions. The proposed numerical methodology was implemented into the Lib-ICE code, based on the OpenFOAM R technology, and validated against experimental data from a light-duty FPT engine. Ten points were considered at different loads and speeds where the engine operates under both conventional Diesel combustion and PCCI mode. A detailed comparison between computed and experimental data was performed in terms of in-cylinder pressure and NO x emissions.

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Modeling advanced combustion modes in compression ignition engines with tabulated kinetics

2019

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Efficient 3-D CFD Combustion Modeling with Transient Flamelet Models

Cited by 49 publications

References 44 publications

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

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

Experimental Validation of Combustion Models for Diesel Engines Based on Tabulated Kinetics in a Wide Range of Operating Conditions

Modeling advanced combustion modes in compression ignition engines with tabulated kinetics

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