Large Eddy Simulation of Droplet Stokes Number Effects on Turbulent Spray Shape

Vuorinen, Ville; Hillamo, Harri; Kaario, Ossi; Larmi, Martti; Fuchs, László

doi:10.1615/atomizspr.v20.i2.10

Cited by 20 publications

(19 citation statements)

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“…The particles with St p 1 tend to follow the fluid flow itself. Yan et al [28] and Luo et al [32] studied a particle laden plane jet in the one-way coupling regime and noted that particle dispersion is the largest when [37][38][39]. In the present paper we extend our previous works by discussing the role of atomization on spray shape.…”

Section: Introductionsupporting

confidence: 68%

“…The modification of turbulence by particles/droplets has been discussed by Elghobashi [20] for homogeneous turbulence and three regimes may be characterized: one-, twoand four-way momentum coupling. Recent DNS and implicit LES studies on particle size effects by Yan et al [28] on particle laden plane jets in the one-way momentum coupling regime (carrier phase remains unaffected by the presence of particles) and by Vuorinen et al [36][37][38][39] on a round particle laden jet in the two-way momentum coupling regime (particles and fluid interact via momentum exchange) at varying mass loadings further support the classical picture. Thereby, the previous studies imply that in numerical spray simulations, the spectrum of droplet sizes and its time evolution needs to be accounted for with adequate accuracy in order to produce a realistic droplet size distribution and hence, realistic distribution of Stokes numbers.…”

Section: Introductionmentioning

confidence: 94%

“…In diesel engines the main emissions of concern are the soot and the NOx emissions which are strongly influenced by the mixture quality inside the fuel spray. Thus, various studies have been carried out which address the spray formation problem and droplet breakup by experiments , by numerical simulations [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], and by theoretical approaches [44][45][46].…”

Section: Introductionmentioning

confidence: 99%

“…The primary breakup region of a spray may be handled by the Volume of Fluid approach as done by Ménard et al [22]. In contrast, the Lagrangian-Eulerian approach (or rather the Lagrangian Particle Tracking, LPT) is usually employed to account for the motion of droplets that hardly interact with each other (as is the case in dilute sprays, downstream from a nozzle exit) [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Furthermore, turbulence in the Eulerian flow part can be handled using Reynolds-Averaged Navier-Stokes (RANS), LargeEddy Simulation (LES) or Direct Numerical Simulation (DNS).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Droplet Size and Atomization on Spray Formation: A Priori Study Using Large-Eddy Simulation

Vuorinen

Hillamo

Kaario

et al. 2010

Flow Turbulence Combust

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The paper is mainly focused to the vast number of researchers who work within direct injection (DI) engine fuel spray simulations. The most common simulation framework today within the community is the Reynolds Averaged Navier Stokes (RANS) approach together with the Lagrangian Particle Tracking (LPT) method. In fact, this study is one of the first studies where high resolution LES/LPT diesel spray modeling is considered. The potential of LES to deepen the present day multidimensional LPT fuel spray simulations is discussed. Spray evolution is studied far from an injector by modeling a spray as a particle laden jet (PLJ). The effect of d on mixing in non-atomizing and atomizing sprays is thoroughly investigated at jet inlet Reynolds number Re = 10 4 and Mach number Ma = 0.3. Based on and justified by rather recent and also quite old ideas, novel and compact views on droplet breakup in turb ulent f lows are pointed out from the literature. We use LES/LPT to illustrate that even in a low Weber number flow (We < 13) the droplet breakup modeling may need considerable attention in contrast to what is typically assumed in the present-day breakup models. LES and LPT techniques are first applied to essentially confirm certain expected droplet size effects on spray shape in nonatomizing monodisperse sprays. In the simulations LES e.g. produces an expected turbulent dispersion pattern that depends on droplet diameter (d) without a droplet dispersion model in contrast to RANS. A new compact droplet breakup model is formulated and tested for droplets that break with a natural resonance time rate according to the Poisson process. As a result of the study: 1) the analysis gives a rigorous and enriching proof of currently existing views on droplet size effects on Flow Turbulence Combust (2011) 86:533-561 mixing, and 2) the presented a priori analysis points out the importance of modeling the resonance breakup even at a low We.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Droplet Size and Atomization on Spray Formation: A Priori Study Using Large-Eddy Simulation

Vuorinen

Hillamo

Kaario

et al. 2010

Flow Turbulence Combust

Self Cite

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“…However, most of preceding works on LES of Diesel sprays [6][7][8][9][10][11] were oriented towards quasi-steady behaviours in very long injection cases, also neglecting injection to injection variability effects. Therefore, dedicated studies have to be performed to assess the ability of LES models to correctly predict spray evolutions and cyclic variations in more realistic Diesel conditions.…”

Section: Introductionmentioning

confidence: 99%

Eulerian – Eulerian Large Eddy Simulations Applied to Non-Reactive Transient Diesel Sprays

Robert

Martinez

Tillou

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 69, n°1, et téléchargeable ici D o s s i e rDOSSIER Edited by/Sous la direction de : C. Angelberger IFP Energies nouvelles International Conference / Les Rencontres Scientifiques d'IFP Energies nouvelles LES4ICE 2012 -Large Eddy Simulation for Internal Combustion Engine FlowsLES4ICE 2012 -La simulation aux grandes échelles pour les écoulements dans les moteurs à combustion interne

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Effect of different parameters on mixture formation and flow field in simulations of an evaporative spray injection test case

Ribeiro

Bimbato

Zanardi

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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Direct injection plays an important role in the efforts to increase efficiency of modern engines, and the correct evaluation of the velocity and fuel mixture fraction fields is crucial for modeling combustion in fuel sprays. Therefore, a computational study has been performed to assess the effect of different parameters on the mixture formation and flow field in the simulation of a single jet of the engine combustion network (ECN) ''Spray G'' evaporative gasoline injection test case. The Lagrangian particle tracking (LPT) approach was tested within both Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) frameworks, and the varieties were compared. Additional parameters that were considered include mesh resolution (0.75, 0.50, and 0.25 mm) and droplet breakup (Reitz-Diwakar, Reitz-KHRT, and Pilch-Erdman), as well as stochastic turbulent dispersion (O'Rourke) and stochastic collision (O'Rourke) models. Experimental penetration length data from both liquid and vapor phases were used to validate the 54 simulations performed within this study. Then, a series of analyses were performed to weigh the effect of each isolated parameter on the outcome of the simulations. Finally, three additional simulations were conducted to study specific issues of LES in fuel spray modeling. In this way, this study was able to make a qualitative comparison of the evaporative spray cloud shapes and the evaluation of spray statistics in terms of the iso-octane mixture fraction and droplet/slip velocities.

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Large Eddy Simulation of Droplet Stokes Number Effects on Turbulent Spray Shape

Cited by 20 publications

References 0 publications

Effect of Droplet Size and Atomization on Spray Formation: A Priori Study Using Large-Eddy Simulation

Effect of Droplet Size and Atomization on Spray Formation: A Priori Study Using Large-Eddy Simulation

Eulerian – Eulerian Large Eddy Simulations Applied to Non-Reactive Transient Diesel Sprays

Effect of different parameters on mixture formation and flow field in simulations of an evaporative spray injection test case

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