LES Simulation of ICE Non-Reactive Flows in Fixed Grids

Brusiani, Federico; Bianchi, Gian Marco

doi:10.4271/2008-01-0959

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…Poinsot, with a variety of other researchers, has used WALE with non-engine flows in the development of a new code for engine applications [25,26]. Bianchi et al have shown good results with WALE in engine flows with a detailed analysis of flow around the intake valves [27,28].…”

Section: T1mentioning

confidence: 99%

Large-eddy simulations for internal combustion engines – a review

Rutland

2011

International Journal of Engine Research

236

150

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A review of using large-eddy simulation (LES) in computational fluid dynamic studies of internal combustion engines is presented. Background material on turbulence modelling, LES approaches, specifically for engines, and the expectations of LES results are discussed. The major modelling approaches for turbulence, combustion, scalars, and liquid sprays are discussed. In each of these areas, a taxonomy is presented for the various types of models appropriate for engines. Advantages, disadvantages, and examples of use in the literature are described for the various types of models. Several recent examples of engine studies using LES are discussed. Recommendations and future prospects are included.

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Section: T1mentioning

confidence: 99%

Large-eddy simulations for internal combustion engines – a review

Rutland

2011

International Journal of Engine Research

236

150

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“…In practical applications, as suggested by Brusiani and Bianchi (2008), a value of LSR < 3-5 can still be accepted for a good LES calculation at a reasonable cost. One advantage of this criterion, compared to the previous one, is that it does not require statistical averaging of the resolved quantities.…”

Section: Assessment Of Les Results Qualitymentioning

confidence: 99%

“…Following again Pope (2000Pope ( , 2004 and Brusiani and Bianchi (2008), the criterion requires that the resolved scales be larger than the dissipation range scales. The demarcation length-scale, between the inertial and dissipative ranges, l DI , is often estimated, according to Pope (2000), as l DI ¼ 60g, where g is the Kolmogorov length scale.…”

Section: Assessment Of Les Results Qualitymentioning

confidence: 99%

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Large-Eddy Simulation (LES) of Spray Transients: Start and End of Injection Phenomena

Battistoni

Xue

Som

2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-This work reports investigations on Diesel spray transients, accounting for internal nozzle flow and needle motion, and demonstrates how seamless calculations of internal flow and external jet can be accomplished in a Large-Eddy Simulation (LES) framework using an Eulerian mixture model. Sub-grid stresses are modeled with the Dynamic Structure (DS) model, a non-viscosity based oneequation LES model. Two problems are studied with high level of spatial and temporal resolution. The first one concerns an End-Of-Injection (EOI) case where gas ingestion, cavitation, and dribble formation are resolved. The second case is a Start-Of-Injection (SOI) simulation that aims at analyzing the effect of residual gas trapped inside the injector sac on spray penetration and rate of fuel injection. Simulation results are compared against experiments carried out at Argonne National Laboratory (ANL) using synchrotron X-ray. A mesh sensitivity analysis is conducted to assess the quality of the LES approach by evaluating the resolved turbulent kinetic energy budget and comparing the outcomes with a length-scale resolution index. LES of both EOI and SOI processes have been carried out on a single hole Diesel injector, providing insights in to the physics of the processes, with internal and external flow details, and linking the phenomena at the end of an injection event to those at the start of a new injection. Concerning the EOI, the model predicts ligament formation and gas ingestion, as observed experimentally, and the amount of residual gas in the nozzle sac matches with the available data. The fast dynamics of the process is described in detail. The simulation provides unique insights into the physics at the EOI. Similarly, the SOI simulation shows how gas is ejected first, and liquid fuel starts being injected with a delay. The simulation starts from a very low needle lift and is able to predict the actual Rate-Of-Injection (ROI) and jet penetration, based only on the prescribed needle motion. Finally, guidelines and future improvements of the model are discussed concerning the simulation of the transient injection phases.Résumé -Simulations aux grandes échelles (Large-Eddy Simulation, LES) de transitoires de jets liquides : phénomènes de début et fin d'injection -Le présent article rend compte d'études sur les transitoires de jets Diesel, prenant en compte l'écoulement interne de l'injecteur et le mouvement de l'aiguille, et démontre comment des calculs d'écoulement interne et de jet peuvent être réalisés dans le cadre d'une approche de type simulation aux grandes échelles (Large-Eddy Simulation, LES) en utilisant un modèle eulérien de mélange. Les contraintes sous-mailles sont modélisées avec un modèle de Structure Dynamique (Dynamic Structure, DS), un modèle LES à une équation non basé sur une viscosité turbulente. Deux problèmes sont étudiés avec un niveau élevé de résolution spatiale et temporelle. Le premier concerne un cas de fin d'injection (End-Of-Injection, EOI), où l'ingestion de gaz, la cavitation, et la for...

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“…Thobois et al [3,4] performed methodological studies about the LES applications to steady flow rings characterized by valves at fixed lift. The same steady state engine flow bench proposed in [3] was also carefully studied by the authors [5,6] adopting specific methodologies to evaluate the LES quality. Moureau et al [7] presented the LES analysis of the generation and disruption of tumble vortexes inside a square piston engine.…”

Section: Introductionmentioning

confidence: 99%

Boundary Conditions and SGS Models for LES of Wall-Bounded Separated Flows: An Application to Engine-Like Geometries

Piscaglia

Montorfano

Onorati

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 69, n°1, et téléchargeable ici D o s s i e rDOSSIER Edited by/Sous la direction de : C. Angelberger IFP Energies nouvelles International Conference / Les Rencontres Scientifiques d'IFP Energies nouvelles LES4ICE 2012 -Large Eddy Simulation for Internal Combustion Engine FlowsLES4ICE 2012 -La simulation aux grandes échelles pour les écoulements dans les moteurs à combustion interne Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 69 (2014) des e´coulements froids dans des ge´ome´tries complexes, comme dans les cylindres des moteurs a`combustion interne. L'imple´mentation de conditions aux limites a`l'entre´e pour la ge´ne´ration de turbulence synthe´tique et de deux mode`les des e´chelles infe´rieures a`la maille, le mode`le local dynamique de Smagorinsky et le mode`le SGS (Sub-Grid Scales) de viscosite´WALE (Wall-Adapting Local Eddy), est de´crite. Le mode`le WALE est baseś ur le carre´du tenseur du gradient de vitesse. Il prend en compte a`la fois les effets de la pression et du taux de rotation des plus petites fluctuations turbulentes de´tectables et il de´crit de manie`re ade´quate l'e´chelle y 3 a`proximite´des parois de la viscosite´turbulente sans ne´cessiter de pression dynamique. Il est ainsi cense´repre´senter un mode`le tre`s fiable pour les simulations ICE. La validation du mode`le a e´te´effectue´e sur deux bancs laminaires stationnaires : une ge´ome´trie a`gradin inverse´(backward-facing) et une ge´ome´trie simple de moteur a`combustion interne avec une unique vanne centrale. L'exhaustivite´de la simulation LES (i.e. la qualite´de la simulation LES) est aussi discute´e.Abstract -Boundary Conditions and SGS Models for LES of Wall-Bounded Separated Flows: An Application to Engine-Like Geometries -The implementation and the combination of advanced boundary conditions and subgrid scale models for Large Eddy Simulations are presented. The goal is to perform reliable cold flow LES simulations in complex geometries, such as in the cylinders of internal combustion engines. The implementation of an inlet boundary condition for synthetic turbulence generation and of two subgrid scale models, the local Dynamic Smagorinsky and the Wall-Adapting Local Eddy-viscosity SGS model (WALE) is described. The WALE model is based on the square of the velocity gradient tensor and it accounts for the effects of both the strain and the rotation rate of the smallest resolved turbulent fluctuations and it recovers the proper y 3 near-wall scaling for the eddy viscosity without requiring dynamic pressure; hence, it is supposed to be a very reliable model for ICE simulation. Model validation has been performed separately on two steady state flow benches: a backward facing step geometry and a simple IC engine geometry with one axed central valve. A discussion on the completeness of the LES simulation (i.e. LES simulation quality) is given.

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LES Simulation of ICE Non-Reactive Flows in Fixed Grids

Cited by 16 publications

References 19 publications

Large-eddy simulations for internal combustion engines – a review

Large-eddy simulations for internal combustion engines – a review

Large-Eddy Simulation (LES) of Spray Transients: Start and End of Injection Phenomena

Boundary Conditions and SGS Models for LES of Wall-Bounded Separated Flows: An Application to Engine-Like Geometries

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