In the present paper, a comprehensive, wall-adapted zonal URANS/LES methodology is shown for the multidimensional simulation of modern direct-injection engines. This work is the latest update of a zonal hybrid turbulence modeling approach, specifically developed by the authors for a flexible description of in-cylinder turbulent flow features with an optimal balance between computational costs and accuracy. Compared to the previous developments, a specific near-wall treatment is added, in order to preserve full-URANS behavior in the first near-wall cells, having in mind typically available mesh resolution in this part of the fluid domain. The updated methodology is applied to the multi-cycle simulation of a reference single-cylinder optical engine, which features a twin-cam, overhead-valve pent-roof cylinder head, and is representative of the current generation of spark-ignited direct-injection thermal power units. Results based on phase-specific flow field statistics and synthetic quality indices demonstrate the consistency and effectiveness of the proposed methodology, which is then qualified as a suitable candidate for affordable scale-resolving analyses of cycle to cycle variability (CCV) phenomena in direct-injection engines.

Iacovano, C., D'Adamo, A., Fontanesi, S., Di Ilio, G., Krastev, V.k. (2021). A wall-adapted zonal URANS/LES methodology for the scale-resolving simulation of engine flows. INTERNATIONAL JOURNAL OF ENGINE RESEARCH [10.1177/14680874211032379].

A wall-adapted zonal URANS/LES methodology for the scale-resolving simulation of engine flows

Krastev V. K.
2021-07-01

Abstract

In the present paper, a comprehensive, wall-adapted zonal URANS/LES methodology is shown for the multidimensional simulation of modern direct-injection engines. This work is the latest update of a zonal hybrid turbulence modeling approach, specifically developed by the authors for a flexible description of in-cylinder turbulent flow features with an optimal balance between computational costs and accuracy. Compared to the previous developments, a specific near-wall treatment is added, in order to preserve full-URANS behavior in the first near-wall cells, having in mind typically available mesh resolution in this part of the fluid domain. The updated methodology is applied to the multi-cycle simulation of a reference single-cylinder optical engine, which features a twin-cam, overhead-valve pent-roof cylinder head, and is representative of the current generation of spark-ignited direct-injection thermal power units. Results based on phase-specific flow field statistics and synthetic quality indices demonstrate the consistency and effectiveness of the proposed methodology, which is then qualified as a suitable candidate for affordable scale-resolving analyses of cycle to cycle variability (CCV) phenomena in direct-injection engines.
lug-2021
Online ahead of print
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/08 - MACCHINE A FLUIDO
English
Con Impact Factor ISI
Turbulence; zonal URANS/LES; DES; wall-adapted; DI engines
https://journals.sagepub.com/doi/10.1177/14680874211032379
Iacovano, C., D'Adamo, A., Fontanesi, S., Di Ilio, G., Krastev, V.k. (2021). A wall-adapted zonal URANS/LES methodology for the scale-resolving simulation of engine flows. INTERNATIONAL JOURNAL OF ENGINE RESEARCH [10.1177/14680874211032379].
Iacovano, C; D'Adamo, A; Fontanesi, S; Di Ilio, G; Krastev, Vk
Articolo su rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/297717
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