2014/12/28 by F. Thiesset, Thiesset, F., Guillaume Maurice +14
Engineering · Environmental Science · Physics and Astronomy · #Combustion and flame dynamics #FOS: Physical sciences #Fire dynamics and safety research #Fluid Dynamics (physics.flu-dyn) #Wind and Air Flow Studies #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.1412.8136
In preparation, 6 pages, 2 figures
arxiv created 2014/12/28 · openalex publication_date 2014/12/28 · arxiv updated 2014/12/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 Damköhler 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.