Large Eddy Simulation of Spray Injection to Turbulent Flows from a Slit Nozzle

Arai, Jun; Oshima, Nobuyuki; Oshima, Masaharu; Itô, Hisashi; Kubota, Masato

doi:10.1299/jfst.2.601

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…at Helsinki University of Technology [10, 140] for diesel applications with T5 and later T1 turbulence models and a C3a combustion model, and (c) Aria et al . [141] for direct injection gasoline applications using a T2 turbulence model.…”

Section: Les Models In Ic Enginesmentioning

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: Les Models In Ic Enginesmentioning

confidence: 99%

Large-eddy simulations for internal combustion engines – a review

Rutland

2011

International Journal of Engine Research

236

150

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“…Smagorinsky model has been used for direct injection gasoline sprays: with RANS correlations [Ara+07], with the VOF method to simulate internal and near-nozzle flow [Bia+07] or to examine cycle-to-cycle variations [Ado+07; Gra+12]. Regarding diesel sprays, some of the most recent work has been carried out by a group at Argonne National Lab.…”

Section: Dynamic Structure (Ds)mentioning

confidence: 99%

Agent-supported simulation environment for intelligent manufacturing and warehouse management systems

Ruiz

Giret

Botti

et al. 2011

International Journal of Production Research

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The main objective of this PhD thesis is the study of Diesel sprays under evaporative conditions by means of Large Eddy Simulations (LES) techniques. This study has been performed implementing a precise, low-demanding LES model in the free, full-purpose Computational Fluid Dynamics (CFD) code OpenFOAM.The starting point was a careful and exhaustive review of the physical processes involved in sprays. An emphasis in CFD methodology, particularly for LES methods, was essential for the thesis, as we were able to find the possible problems and limitations of our approximation. Moreover, as the most widely used techniques for the industrial simulation of sprays are based on the Reynolds-Averaged Navier-Stokes models, we have highlighted the many advantages of LES modeling. As the latter are, by definition, more computationally expensive than RANS, we made an optimal configuration that, while it is able to recover accurately the experimental results, its characteristic time is in the same order of magnitude that RANS ones. As applicability is a must in this thesis, we use the surname "Engineering" LES.One of the key points of the thesis has been the correct configuration of the flow turbulent conditions on the inlet. In order to get accurate results, the turbulent structures coming from this inlet need to be time-and spacecoherent. An adequate calibration of this conditions is needed to perform any spray simulation.Last but not least, all the simulations performed where validated against experiments, obtaining a very good agreement even close to the nozzle. vi ResumenEl objetivo principal de esta tesis es el estudio del modelado numérico de chorros diesel evaporativos mediante la técnica de la simulación de grandes remolinos (LES por sus siglas en inglés). Este estudio se ha realizado mediante la implementación de un modelo LES de altas prestaciones y poco consumo informático en el código libre de dinámica de fluidos computacional (CFD) OpenFOAM.El trabajo de esta tesis ha partido de una revisión exhaustiva de los procesos físicos que tienen lugar en el chorro desde la perspectiva del modelado CFD en general y LES en particular. Esta revisión nos ha permitido identificar los problemas y limitaciones de nuestro planteamiento. Además, dado que la principal técnica CFD usada para el modelado de chorro diesel en procesos industriales son los modelos basados en las ecuaciones promediadas de Reynolds (RANS), se ha incidido en la tesis sobre las ventajas del modelado LES. Dado que estas técnicas son inherentemente más caras que los métodos RANS, se ha hecho hincapié en conseguir una configuraciónóptima que, siendo lo más fiel posible a los resultados experimentales, esté cercana a los tiempos propios de las técnicas RANS. Entendiendo que se quiere hacerénfasis en la aplicabilidad del modelo, se habla de "Engineering" LES.Uno de los puntos claves de la tesis es la adecuada configuración de las condiciones de contorno turbulentas a la entrada de la tobera, que necesitan ser coherentes tanto en espacio como en tiempo. L...

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“…Some of these studies have utilized the Taylor analogy breakup (TAB) models. 31–33 While this approach can give satisfactory results under certain DISI operating conditions, it has a few shortcomings such as the somewhat arbitrary breakup criteria and the assumption of instantaneous breakup. 12,28 Recently, Van Dam and Rutland 34 explored the possibility of applying a diesel-type breakup model to DISI gasoline sprays.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

Rutland

Pérez

et al. 2020

International Journal of Engine Research

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In this work, a hybrid breakup model tailored for direct-injection spark-ignition engine sprays is developed and implemented in the OpenFOAM CFD code. The model uses the Lagrangian–Eulerian approach whereby parcels of liquid fuel are injected into the computational domain. Atomization and breakup of the liquid parcels are described by two sub-models based on the breakup mechanisms reported in the literature. Evaluation of the model has been carried out by comparing large-eddy simulation results with experimental measurements under multiple direct-injection spark-ignition engine-like conditions. Spray characteristics including liquid and vapor penetration curves, droplet velocities, and Sauter mean diameter distributions are examined in detail. The model has been found to perform well for the spray conditions considered in this work. Results also show that after the end of injection, most of the residual droplets that are still in the breakup process are driven by the bag and bag–stamen breakup mechanisms. Finally, an effort to unify the breakup length parameter is made, and the given value is tested under various ambient density and temperature conditions. The predicted trends follow the measured data closely for the penetration rates, even though the model is not specifically tuned for individual cases.

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Large Eddy Simulation of Spray Injection to Turbulent Flows from a Slit Nozzle

Cited by 5 publications

References 7 publications

Large-eddy simulations for internal combustion engines – a review

Large-eddy simulations for internal combustion engines – a review

Agent-supported simulation environment for intelligent manufacturing and warehouse management systems

Large-eddy spray simulation under direct-injection spark-ignition engine-like conditions with an integrated atomization/breakup model

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