Two-phase filtered mass density function for LES of turbulent reacting flows

Li, Zhenglong; Banaeizadeh, Araz; Jaberi, Farhad

doi:10.1017/jfm.2014.573

Cited by 12 publications

(7 citation statements)

References 96 publications

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“…the species mass fractions and enthalpy) is computed by the FMDF. The FMDF is obtained by solution of its transport equation with an efficient Lagrangian stochastic Monte Carlo method, with spray effects included [15,22]. The spray is simulated with a non-equilibrium Lagrangian particle method together with a stochastic droplet breakup model which allows full two-way mass, momentum, and energy coupling between phases [51].…”

Section: Mathematical and Computational Modelmentioning

confidence: 99%

“…The scalar FMDF is a joint probability density function of the scalars (species mass fractions and energy) at the subgrid-level, which was originally developed by Jaberi et al [15] for single-phase reacting flows and has proven to be very reliable and accurate for these flows [16,17,18,19,21,55,56,57]. Li et al [22] extended the original FMDF to two-phase flows. Banaeizadeh et al [52] included the compressibility effects in the scalar FMDF methodology.…”

Section: Two-phase Filtered Mass Density Functionmentioning

confidence: 99%

“…with different chemical kinetic models [6,16,17,18,19,20,21]. Li et al [22] developed a two-phase FMDF model for simulation of two-phase reacting flows. They validated the model by comparison with DNS data in a spatially developing droplet-laden reactive mixing layer.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large eddy simulation of turbulent spray combustion

Irannejad

Banaeizadeh

Jaberi

2015

Combustion and Flame

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The two-phase filtered mass density function (FMDF) method is employed for large eddy simulation (LES) of high speed evaporating and combusting nheptane sprays using simple (global) and complex (skeletal) chemical kinetic mechanisms. The resolved fluid velocity and pressure fields are obtained by solving the filtered compressible Navier-Stokes equations with high-order Eulerian finite difference methods. The liquid spray and gas scalar (temperature and species mass fractions) fields are both obtained by Lagrangian stochastic models. The chemistry calculation is accelerated by incorporating the parallel in situ adaptive tabulation (ISAT) method. There are two-way interactions among Eulerian and Lagrangian fields. Simulations of evaporating sprays with and without combustion indicate that the two-phase LES/FMDF results are consistent and compare well with the available experimental data at different gas temperatures and oxygen concentrations. The spray controlled flame tends to move away from a diffusion flame structure toward a premixed one as the oxygen concentration decreases and/or the ambient gas temperature increases because of changes in spray-induced turbulence and mixing. The LES/FMDF results for ignition delay show more sensitivity to the chemical kinetic model at lower gas temperatures due to slower reaction and stronger turbulence-chemistry interactions. The liftoff length is less sensitive to the kinetics.

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Section: Mathematical and Computational Modelmentioning

confidence: 99%

Section: Two-phase Filtered Mass Density Functionmentioning

confidence: 99%

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Large eddy simulation of turbulent spray combustion

Irannejad

Banaeizadeh

Jaberi

2015

Combustion and Flame

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“…[10][11][12] Inclusion of entropy and irreversibility is reported in Refs., [13][14][15] and extension to multi-phase flows in Refs. 16,17 Hydrodynamic closure in incompressible, non-reacting flows has been achieved via the marginal velocity-FDF (V-FDF), 18 and the FDF which considers only the species mass fraction field is the…”

Section: -8mentioning

confidence: 99%

Self-contained filtered density function

et al. 2017

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“…So the current subgrid models make the overall "chamber-scale" approach poorly predictive. Ongoing research aims at modeling two-phase turbulence [11][12][13][14], potentially with phase change and chemistry. But even these advanced models are limited when the liquid mass loading becomes high; i.e., near the liquid core.…”

Section: Introductionmentioning

confidence: 99%

On Multi-Fluid models for spray-resolved LES of reacting jets

Doisneau

Arienti

Oefelein

2017

Proceedings of the Combustion Institute

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Numerical simulation of sprays can potentially be used for assessing the performance and variability of engines. But today's simulations only provide average quantities, after calibration. Spray injection can be thought of as a multiscale problem with 4 levels (chamber, mixing layer, drop scale, and nozzle). Because of their complex interactions, increasing predictivity requires simulations to capture more of these scales. To assess the trade-offs in this regard, we perform a review of recent Diesel spray simulations. After highlighting the importance of the mixing layer in driving spray dynamics, we analyze various two-phase flow formalisms and show the potential benefits of a Eulerian spray formulation combined with Large Eddy Simulation (LES) to capture a variable-density mixing layer (VDML). We then present a framework and numerical methods to make this description operative and show how it performs on a realistic autoignition case called Spray A.

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Two-phase filtered mass density function for LES of turbulent reacting flows

Cited by 12 publications

References 96 publications

Large eddy simulation of turbulent spray combustion

Large eddy simulation of turbulent spray combustion

Self-contained filtered density function

On Multi-Fluid models for spray-resolved LES of reacting jets

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