RANS and LES Modelling of Premixed Turbulent Combustion

Cant, Stewart

doi:10.1007/978-94-007-0412-1_4

Cited by 15 publications

(14 citation statements)

References 70 publications

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“…The modelling of a T is also typically done by splitting the contributions into mean and fluctuating fields and obtaining accurate models for the various contributions to the flame surface density has been the subject of many earlier studies Peters, 2000;Peters et al, 1998). The FSD method has also been developed for LES of turbulent premixed flames and these works are summarised by Vervisch et al (2011) andCant (2011).…”

Section: Flame Surface Density Modelmentioning

confidence: 99%

Modelling of Turbulent Premixed and Partially Premixed Combustion

Veera¹,

Masood²,

Ruan³

et al. 2012

Advanced Fluid Dynamics

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Section: Flame Surface Density Modelmentioning

confidence: 99%

Modelling of Turbulent Premixed and Partially Premixed Combustion

Veera¹,

Masood²,

Ruan³

et al. 2012

Advanced Fluid Dynamics

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“…The LES studies on turbulent combustion are reviewed by Pitsch (2006) and Gicquel et al (2012). The combustion is usually a sub-grid scale (SGS) phenomenon requiring modeling and various modeling approaches used for premixed combustion are reviewed and summarized in earlier studies (Cant, 2011;Gicquel et al, 2012;Poinsot and Veynante, 2005;Swaminathan and Bray, 2011). These approaches can be broadly categorized into two classes, namely, flamelets and non-flamelets or geometrical and statistical (Gicquel et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Premixed Combustion: Sensitivity to Subgrid Scale Velocity Modeling

Langella

Swaminathan

Gao

et al. 2016

Combustion Science and Technology

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An algebraic reaction rate closure involving filtered scalar dissipation rate of reaction progress variable is studied. The filtered scalar dissipation rate closure requires a model for sub-grid scale velocity, u 0 Δ , which is estimated using four algebraic models and transported subgrid scale kinetic energy. A priori analyses using direct numerical simulation (DNS) data show that the filtered dissipation rate, and thus the reaction rate closure, has some sensitivity to the u 0 Δ model. The sensitivity of various statistics obtained from large eddy simulation (LES) of three piloted Bunsen flames of stoichiometric methaneair mixture to the modeling of u 0 Δ is observed to be weaker compared to that for the DNS analysis. Moreover, analysis using transported sub-grid scale kinetic energy does not indicate a necessity to include flame-generated turbulence in the modeling of u 0 Δ for the Bunsen flames in the thin reaction zones regime. The measured and computed flame brush structures are compared and studied and the algebraic closure for the filtered reaction rate is found to be quite good. ARTICLE HISTORY

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“…In the view of RANS methodology the average value of the flame stretch, Φ s , is expected to be predominantly positive and many modelling methods have been proposed in the past with this view. A summary of these studies is provided by Veynante and Vervisch (2002) and Cant (2011).…”

Section: Introductionmentioning

confidence: 99%

“…(2) one observes that there will be three contributions to the filtered stretch rate; the first contribution comes from the filtered tangential strain rate part, the second contribution comes from the filtered curvature related term and the third contribution comes from the sub-grid scales. As Cant (2011) points out, it is convenient to combine the curvature term with the third, the flame propagation, term in the LHS of Eq. (1).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Flame Stretch in Turbulent Lifted Jet Flame

Ruan

Swaminathan

Mizobuchi

2014

Combustion Science and Technology

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DNS data of a laboratory-scale turbulent lifted hydrogen jet flame has been analysed to show that this flame has mixed mode combustion not only at the flame base but also in downstream locations. The mixed mode combustion is observed in instantaneous structures as in earlier studies and in averaged structure, in which the predominant mode is found to be premixed combustion with varying equivalence ratio. The nonpremixed combustion in the averaged structure is observed only in a narrow region at the edge of the jet shear layer. The analyses of flame stretch show large probability for negative flame stretch leading to negative surface averaged flame stretch. The displacement speed-curvature correlation is observed to be negative contributing to the negative flame stretch and partial premixing resulting from jet entrainment acts to reduce the negative correlation. The contribution of turbulent straining to the flame stretch is observed to be negative when the scalar gradient aligns with the most extensive principal strain rate. The physics behind the negative flame stretch resulting from turbulent straining is discussed and elucidated through a simple analysis of the flame surface density transport equation.

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RANS and LES Modelling of Premixed Turbulent Combustion

Cited by 15 publications

References 70 publications

Modelling of Turbulent Premixed and Partially Premixed Combustion

Modelling of Turbulent Premixed and Partially Premixed Combustion

Large Eddy Simulation of Premixed Combustion: Sensitivity to Subgrid Scale Velocity Modeling

Investigation of Flame Stretch in Turbulent Lifted Jet Flame

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