Modelling of the subgrid scale wrinkling factor for large-eddy simulation of turbulent premixed combustion

We propose a model for assessing the unresolved wrinkling factor in LES of turbulent premixed combustion. It relies essentially on a power-law dependence of the wrinkling factor to the filter size and an original expression for the active corrugating strain rate. The latter is written as a product o...

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Bibliographic Details
Published in:arXiv.org 2014-12
Main Authors: Thiesset, F, Maurice, G, Halter, F, Mazellier, N, Chauveau, C, Gökalp, I
Format: Article
Language:English
Subjects:
Combustion
Computer simulation
Dependence
Fractal geometry
Fractals
Large eddy simulation
Strain rate
Wrinkling
Online Access:Get full text
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Summary:We propose a model for assessing the unresolved wrinkling factor in LES of turbulent premixed combustion. It relies essentially on a power-law dependence of the wrinkling factor to the filter size and an original expression for the active corrugating strain rate. The latter is written as a product of an efficiency function which accounts for viscous effects and the kinematic constraint of Peters, by a recent expression for the turbulent strain intensity. Yields functional expressions for the fractal dimension and the inner cut-off length scale, the latter being (i) filter-size independent and (ii) consistent with the Damk\"ohler asymptotic behaviors at both large and small Karlovitz numbers. A new expression for the wrinkling factor which incorporates finite Reynolds numbers effects is further proposed. Finally, the model is successfully assessed on an experimental filtered database.
ISSN:2331-8422