Disruption of a compressed vortex

Borée, Jacques; Maurel, Stéphane; Bazile, R.

doi:10.1063/1.1472505

Cited by 63 publications

(42 citation statements)

References 31 publications

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“…The filtered Smagorinsky model is similar to the Smagorinsky model but the velocity field is explicitly filtered with a higher-filter width before the evaluation of the turbulent viscosity. It has been developed to better represent the local phenomena of the flow [3]. Finally, the WALE model [3], also based on the Smagorinsky model, is used for wall-bounded flows attempting to recover the scaling laws of the wall.…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…It has been developed to better represent the local phenomena of the flow [3]. Finally, the WALE model [3], also based on the Smagorinsky model, is used for wall-bounded flows attempting to recover the scaling laws of the wall.…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…Note that a problem that still needs to be resolved is the exchange of kinetic energy between resolved and sub-grid scale, which will be the object of future research. The square piston experiment has been designed at IMFT to study the compression and the disruption of a tumble vortex [3,11]. The main goal was to better understand the flow structures and phenomena in SparkIgnition (SI) engines.…”

Section: Interpolation Between Mesh Phases: Adaptations For Lesmentioning

confidence: 99%

See 2 more Smart Citations

Towards Large Eddy Simulation in Internal-Combustion Engines: Simulation of a Compressed Tumble Flow

Moureau¹,

Barton²,

Angelberger³

et al. 2004

SAE Technical Paper Series

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The development of the Large Eddy Simulation (LES) 3D CFD code AVBP to yield a CFD tool able to predict cyclic variability in Internal Combustion (IC) engines is reported. In a first step the implementation of an Arbitrary Lagrangian Eulerian (ALE) method into AVBP is described, allowing to move solid boundaries. Then the principles and implementation of the Conditioned Temporal Interpolation (CTI) mesh management technique is described, and some specific adaptations for LES simulations are discussed. Finally a first validation of the so obtained LES IC engine code is presented by comparing predictions with findings on the square piston experiment.

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Section: Turbulence Modelsmentioning

confidence: 99%

Section: Turbulence Modelsmentioning

confidence: 99%

Section: Interpolation Between Mesh Phases: Adaptations For Lesmentioning

confidence: 99%

See 1 more Smart Citation

Towards Large Eddy Simulation in Internal-Combustion Engines: Simulation of a Compressed Tumble Flow

Moureau¹,

Barton²,

Angelberger³

et al. 2004

SAE Technical Paper Series

View full text Add to dashboard Cite

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“…Before 100 • CA, an accurate tumble identification is not possible since the large-scale tumble structure is too weak. As expected, significant CCV of the tumble center occur, which is also known as PVC and was also identified in previous investigations [4,7,8]. Especially close to the symmetry plane, a significant movement of the tumble center can be observed during the entire intake stroke and even in the phase when the piston remains in its lowest position.…”

Section: Tumble Generationmentioning

confidence: 50%

“…Borée et al [7] analyzed the generation of the tumbling motion using particle image velocimetry (PIV). One of the major findings was the existence of a precessing vortex core (PVC), which was also observed in a numerical study by Hasse et al [8].…”

Section: Introductionmentioning

confidence: 99%

A Combined Numerical and Experimental Study of the 3D Tumble Structure and Piston Boundary Layer Development During the Intake Stroke of a Gasoline Engine

Buhl

Gleiss

Köhler

et al. 2016

Flow Turbulence Combust

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Due to its positive effect on flame propagation in the case of a well-defined breakdown, the formation of a large-scale tumble motion is an important goal in engine development. Cycle-to-cycle variations (CCV) in the tumble position and strength however lead to a fluctuating tumble breakdown in space and time and therefore to combustion variations, indicated by CCV of the peak pressure. This work aims at a detailed investigation of the large-scale tumble motion and its interaction with the piston boundary layer during the intake stroke in a state-of-the-art gasoline engine. To allow the validation of the flow near the piston surface obtained by simulation, a new measurement technique called "Flying PIV" is applied. A detailed comparison between experimental and simulation results is carried out as well as an analysis of the obtained flow field. The large-scale tumble motion is investigated based on numerical data of multiple highly resolved intake strokes obtained using scale-resolving simulations. A method to detect the tumble center position within a 3D flow field, as an extension of previously developed 2D and 3D algorithms, is presented and applied. It is then used to investigate the phase-averaged tumble structure, its characteristics in terms of angular velocity and the CCV between the individual intake strokes. Finally, an analysis is presented of the piston boundary layer and how it is influenced by the tumble motion during the final phase of the intake stroke.

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In‐Cylinder Flow

Borée

Miles

2014

Encyclopedia of Automotive Engineering

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The general properties and evolution of in‐cylinder flows are reviewed, from the initial generation of turbulence and large‐scale bulk structures during the induction process until the early expansion stroke period, when flow processes continue to aid with the completion of combustion. Flows typical of both spark ignition and compression ignition engine technologies are described. Our primary emphasis is on providing the practicing engineer and engine designer with a physical understanding of the storage of flow energy in large‐scale rotating structures; the mechanisms by which this energy can be extracted to enhance turbulent mixing processes; the interaction of these flow structures with the compression, fuel injection, and combustion processes; and the fluid‐dynamical origin of cycle‐to‐cycle fluctuations in the combustion process. We further examine characteristics of the turbulence, with the objective of providing engineers with a natural understanding of how turbulence scales relate to engine parameters (bore, stroke, speed, etc.) and of how turbulence is generated and dissipated throughout the engine cycle. Various methods used to characterize and separate the turbulence from large‐scale, coherent cycle‐to‐cycle fluctuations in the flow, and tools to characterize the topology of the flow, are also briefly reviewed. Lastly, we identify several areas, principally related to turbulence generation and dissipation in engines, to the elucidation of flow structures and their cycle‐to‐cycle variation, and to near‐wall flows, that are still poorly understood and that would benefit from additional investigations by the research community.

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Disruption of a compressed vortex

Cited by 63 publications

References 31 publications

Towards Large Eddy Simulation in Internal-Combustion Engines: Simulation of a Compressed Tumble Flow

Towards Large Eddy Simulation in Internal-Combustion Engines: Simulation of a Compressed Tumble Flow

A Combined Numerical and Experimental Study of the 3D Tumble Structure and Piston Boundary Layer Development During the Intake Stroke of a Gasoline Engine

In‐Cylinder Flow

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