NDLI: Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions

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Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions

Content Provider	MDPI
Author	Bulut, Tekgül Gadalla, Mahmoud Kannan, Jeevananthan Karimkashi, Shervin Kaario, Ossi Vuorinen, Ville
Copyright Year	2020
Description	In this study, various mixing and evaporation modeling assumptions typically considered for large-eddy simulation (LES) of the well-established Engine Combustion Network (ECN) Spray A are explored. A coupling between LES and Lagrangian particle tracking (LPT) is employed to simulate liquid n-dodecane spray injection into hot inert gaseous environment, wherein Lagrangian droplets are introduced from a small cylindrical injection volume while larger length scales within the nozzle diameter are resolved. This LES/LPT approach involves various modeling assumptions concerning the unresolved near-nozzle region, droplet breakup, and LES subgrid scales (SGS) in which their impact on common spray metrics is usually left unexplored despite frequent utilization. Here, multi-parametric analysis is performed on the effects of (i) cylindrical injection volume dimensions, (ii) secondary breakup model, particularly Kelvin–Helmholtz Rayleigh–Taylor (KHRT) against a no-breakup model approach, and (iii) LES SGS models, particularly Smagorinsky and one-equation models against implicit LES. The analysis indicates the following findings: (i) global spray characteristics are sensitive to radial dimension of the cylindrical injection volume, (ii) the no-breakup model approach performs equally well, in terms of spray penetration and mixture formation, compared with KHRT, and (iii) the no-breakup model is generally insensitive to the chosen SGS model for the utilized grid resolution.
Starting Page	3360
e-ISSN	19961073
DOI	10.3390/en13133360
Journal	Energies
Issue Number	13
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2020-07-01
Access Restriction	Open
Subject Keyword	Energies Coatings and Films Spray Modeling Large-eddy Simulation Lagrangian Particle Tracking Droplet-laden Multiphase Turbulence Subgrid Scale Droplet Breakup Evaporation Ecn Openfoam
Content Type	Text
Resource Type	Article

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