LARGE EDDY SIMULATION OF HIGH-VELOCITY FUEL SPRAYS: STUDYING MESH RESOLUTION AND BREAKUP MODEL EFFECTS FOR SPRAY A

2013 ◽  
Vol 23 (5) ◽  
pp. 419-442 ◽  
Author(s):  
Armin Wehrfritz ◽  
Ville Vuorinen ◽  
Ossi Kaario ◽  
Martti Larmi
Keyword(s):  
Large Eddy Simulation ◽  
High Velocity ◽  
Fuel Sprays ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Mesh Resolution ◽  
Breakup Model

Large-eddy simulation of shear flows and high-speed vaporizing liquid fuel sprays

2014 ◽  
Vol 105 ◽  
pp. 262-279 ◽  
Author(s):  
Chi-Wei Tsang ◽  
Mario F. Trujillo ◽  
Christopher J. Rutland
Keyword(s):  
Large Eddy Simulation ◽  
High Speed ◽  
Liquid Fuel ◽  
Shear Flows ◽  
Fuel Sprays ◽  
Eddy Simulation ◽  
Large Eddy

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

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3360
Author(s):  
Mahmoud Gadalla ◽  
Jeevananthan Kannan ◽  
Bulut Tekgül ◽  
Shervin Karimkashi ◽  
Ossi Kaario ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Sensitivity Study ◽  
Droplet Breakup ◽  
Injection Volume ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Subgrid Scales ◽  
Secondary Breakup ◽  
Breakup Model ◽  
Model Approach

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.

scholarly journals Large-Eddy Simulation of an Asymmetric Plane Diffuser: Comparison of Different Subgrid Scale Models

Symmetry ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1337 ◽  
Author(s):  
Hui Tang ◽  
Yulong Lei ◽  
Xingzhong Li ◽  
Yao Fu
Keyword(s):  
Large Eddy Simulation ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Diffuser Flow ◽  
Scale Models ◽  
Large Eddy ◽  
Mesh Resolution ◽  
Flow Through ◽  
Computational Analyses ◽  
High Order Finite Difference

Large-eddy simulation (LES) of separated turbulent flow through an asymmetric plane diffuser is investigated. The outcome of an actual LES depends on the quality of the subgrid-scale (SGS) model, as well as the accuracy of the numerical method used to solve the equations for the resolved scales. In this paper, we focus on the influence of SGS models for LES of the diffuser flow through using a high-order finite difference method to solve the equations for the resolved scales. Six resolutions are computed to investigate the influence of mesh resolution. Four existing SGS models, a new one-equation dynamic SGS model and a direct numerical simulation (DNS) are conducted in the diffuser flow. A series of computational analyses is performed to assess the performance of different SGS models on the coarse grids. By comparison with the experiment and DNS, the results produced by the new one-equation dynamic model give better agreement with experiment and DNS than the four other existing SGS models.

LARGE EDDY SIMULATION OF DROPLET STOKES NUMBER EFFECTS ON MIXTURE QUALITY IN FUEL SPRAYS

2010 ◽  
Vol 20 (5) ◽  
pp. 435-451 ◽  
Author(s):  
Ville Vuorinen ◽  
Harri Hillamo ◽  
Ossi Kaario ◽  
M. Nuutinen ◽  
Martti Larmi ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Stokes Number ◽  
Fuel Sprays ◽  
Eddy Simulation ◽  
Large Eddy
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