Hybrid presumed pdf and flame surface density approaches for Large-Eddy Simulation of premixed turbulent combustion. Part 2: Early flame development after sparking

Lecocq, Guillaume; Richard, Stéphane; Colin, Olivier

doi:10.1016/j.combustflame.2010.10.015

Cited by 11 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies showed a good comparison to the experimental data. Recently, a combustion modeling approach combining the FSD and presumed probability density function (pdf) concepts have been used (Lecocq et al, 2011) to calculate the spherical flame propagation in weak turbulence (Renou et al, 2000). In RANS, the averaged governing equations are solved along with models for turbulent stresses and fluxes and mean reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Spherically Expanding Turbulent Premixed Flames

Ahmed

Swaminathan

2013

Combustion Science and Technology

View full text Add to dashboard Cite

Statistically spherical expanding turbulent premixed flames are computed using an unsteady Reynolds-averaged Navier-Stokes (URANS) approach. Mean reaction rate is closed using strained and unstrained flamelet models and an algebraic model. The flamelets are parametrized using the scalar dissipation rate in the strained flamelet model. It is shown that this model is able to capture the measured growth rate of methane-air turbulent flame ball, which is free of thermo-diffusive instability. The spherical flames are observed to accelerate continuously. The flame brush thickness grows in time and the role of turbulent diffusion on this growth seems secondary compared to the convection due to the fluid velocity induced by the chemical reaction. The spherical flames have larger turbulent flame speed, the leading-edge displacement speed s t , compared to the planar flames for a given turbulence and thermochemical condition. The computational results suggest s t =s 0 L $ Re n t with 0.57 n 0.58, where Re t is the turbulence Reynolds number and s 0 L is the unstrained planar laminar flame speed, for both spherical and planar flames.

show abstract

Section: Introductionmentioning

confidence: 99%

Simulation of Spherically Expanding Turbulent Premixed Flames

Ahmed

Swaminathan

2013

Combustion Science and Technology

View full text Add to dashboard Cite

show abstract

“…where P (c * ; c(x, t), c v (x, t)) is the presumed pdf. A characteristic length scale may also be added to the modeling framework, by combining the pdf with the Flame Surface Density (FSD) concept [32,33]. In an attempt to account for the time history of micro-mixing, it has been proposed in [34] to include as a control parameter of the filtered thermo-chemistry lookup table, the age of fluid particles since their injection.…”

Section: Background and Methodologymentioning

confidence: 99%

Direct mapping from LES resolved scales to filtered-flame generated manifolds using convolutional neural networks

Seltz

Domingo

Vervisch

et al. 2019

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

“…The balance equation for Y c should preserve some features of Eq. ( 4), as ensuring flame propagation at the correct speed and also capturing the proper order of magnitude of the flame thickness, a point that was also discussed in the case of a swirl burner and flame propagation after sparking in [52,53].…”

Section: Preserving Flame Speed In Presumed-pdf Modelingmentioning

confidence: 99%

Large Eddy Simulation of turbulent flames in a Trapped Vortex Combustor (TVC) – A flamelet presumed-pdf closure preserving laminar flame speed

Merlin

Domingo

Vervisch

2012

Comptes Rendus. Mécanique

Self Cite

View full text Add to dashboard Cite

Flow and flame dynamics inside a trapped vortex combustor are analyzed from Large Eddy Simulation (LES) results compared against measurements. The Navier-Stokes equations are solved in their fully compressible form over a Cartesian grid resorting to immersed boundaries to account for the complex geometry, composed of an annular flow impacting a set of axisymmetric rods (flame holders) before interacting with a cavity. Various cases are considered, varying the main flow rate, the length of the cavity, injecting secondaryair and also adding a swirling motion. From these cases, three main cavity flow regimes emerge. The modeling of molecular diffusion in LES with presumed probability density function (pdf), as filter of premixed flamelets, is also discussed. It is shown that a dynamic correction to molecular diffusion may be computed from the pdf control parameters to ensure the correct laminar flame speed, whatever the mesh used. Finally, studying the turbulent flame evolution within the cavity in the various cases, suggests that swirling motion is mandatory to favor the global burner stability.

show abstract

Hybrid presumed pdf and flame surface density approaches for Large-Eddy Simulation of premixed turbulent combustion. Part 2: Early flame development after sparking

Cited by 11 publications

References 41 publications

Simulation of Spherically Expanding Turbulent Premixed Flames

Simulation of Spherically Expanding Turbulent Premixed Flames

Direct mapping from LES resolved scales to filtered-flame generated manifolds using convolutional neural networks

Large Eddy Simulation of turbulent flames in a Trapped Vortex Combustor (TVC) – A flamelet presumed-pdf closure preserving laminar flame speed

Contact Info

Product

Resources

About