Molecular diffusion effects in LES of a piloted methane–air flame

Kemenov, Konstantin A.; Pope, Stephen B.

doi:10.1016/j.combustflame.2010.08.014

Cited by 34 publications

(14 citation statements)

References 42 publications

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“…Even though this perspective is exciting and will certainly become true in the next years for simplified lab-scale burners [205,278], it remains probably a very long term option in gas turbines. First, as pointed out in [190,279], conventional approximations provided for the filtered viscous stress tensor may not be sufficient to fully recover expected flame behaviors in the context of fully resolved premixed flames [191]. LES models do not converge to DNS when the number of grid points increases because SGS models usually neglect certain effects.…”

Section: Leadership-class Les Modeling and Predictionsmentioning

confidence: 99%

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Gicquel¹,

Staffelbach²,

Poinsot³

2012

Progress in Energy and Combustion Science

340

169

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Section: Leadership-class Les Modeling and Predictionsmentioning

confidence: 99%

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Gicquel¹,

Staffelbach²,

Poinsot³

2012

Progress in Energy and Combustion Science

340

169

View full text Add to dashboard Buy / Rent full text

“…Note that v(ξ, V ξ ) is known in terms ofξ , V ξ and the approximated flamelet profile v s (ξ), whereas the exact values of v depends on the PDF of the mixture fraction, not solely on its first moments. Similar expressions can be applied to other thermochemical variables [32]. An advantage of the present approach is that it allows to completely exclude the flamelet table look-up procedure and, as a result, associated with it interpolation errors, while a disadvantage being that a PDF corresponding to Eq.…”

Section: Combustion Modelmentioning

confidence: 84%

“…The specification of the combustion model equations and transport properties follows closely to that of [32]. Here, we briefly summarize the main assumptions and resulting equations.…”

Section: Combustion Modelmentioning

confidence: 99%

“…where C is a model constant chosen to be C = 2 [32]. The closure of the subgrid terms is based on the subgrid eddy viscosity μ T ( ) as detailed in Section 2.2.…”

Section: Les Equationsmentioning

confidence: 99%

“…The present study, therefore, aims to fill this gap partially by examining the performance of two popular SGS models-the dynamic Smagorinsky SGS model [21] and the Vreman SGS model [22], for a case of the non-premixed methane-air jet flame (Sandia flame D). This piloted flame has been extensively studied experimentally [23,24] and computationally [25][26][27][28][29][30][31][32].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Turbulence Resolution Scale Dependence in Large-Eddy Simulations of a Jet Flame

Kemenov

Wang

et al. 2011

Flow Turbulence Combust

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The explicit dependence of LES fields on the turbulence resolution scale implies that LES statistics usually vary with and exhibit different convergence behaviors for different types of statistics, flow variables and subgrid LES models. The present work compares the performance of two popular subgrid models-the dynamic Smagorinsky model and the Vreman model-based on the convergence of their LES statistics with respect to for a piloted methane-air (Sandia D) flame. The -dependence of the LES statistics is studied based on five grids with progressively increased resolution ranging from 3 × 10 5 to about 10.4 × 10 6 cells. The simulation results show that the resolved velocity statistics converge for the finest grids with some weak -dependence observed in the variance fields. The mixture fraction statistics are found to be more sensitive to the turbulence resolution scale upstream in the flame signifying the importance of the estimation of the -invariant LES statistics at the DNS limit. For the considered flame the Vreman subgrid model exhibits good performance with the statistics being very close to those given by the dynamic Smagorinsky model, and being rather insensitive to a choice of the model constant.

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Molecular diffusion effects in LES of a piloted methane–air flame

Cited by 34 publications

References 42 publications

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Turbulence Resolution Scale Dependence in Large-Eddy Simulations of a Jet Flame

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