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

Author

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  • Mahmoud Gadalla

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

  • Jeevananthan Kannan

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

  • Bulut Tekgül

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

  • Shervin Karimkashi

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

  • Ossi Kaario

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

  • Ville Vuorinen

    (Department of Mechanical Engineering, School of Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland)

Abstract

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.

Suggested Citation

  • Mahmoud Gadalla & Jeevananthan Kannan & Bulut Tekgül & Shervin Karimkashi & Ossi Kaario & Ville Vuorinen, 2020. "Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions," Energies, MDPI, vol. 13(13), pages 1-24, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3360-:d:378868
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    References listed on IDEAS

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    1. Junji Shinjo, 2018. "Recent Advances in Computational Modeling of Primary Atomization of Liquid Fuel Sprays," Energies, MDPI, vol. 11(11), pages 1-25, November.
    2. Kaario, Ossi Tapani & Vuorinen, Ville & Zhu, Lei & Larmi, Martti & Liu, Ronghou, 2017. "Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach," Energy, Elsevier, vol. 120(C), pages 827-841.
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    Cited by:

    1. Guodong Gai & Abdellah Hadjadj & Sergey Kudriakov & Stephane Mimouni & Olivier Thomine, 2021. "Numerical Study of Spray-Induced Turbulence Using Industrial Fire-Mitigation Nozzles," Energies, MDPI, vol. 14(4), pages 1-20, February.
    2. Robert Keser & Alberto Ceschin & Michele Battistoni & Hong G. Im & Hrvoje Jasak, 2020. "Development of a Eulerian Multi-Fluid Solver for Dense Spray Applications in OpenFOAM," Energies, MDPI, vol. 13(18), pages 1-18, September.

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