AFM, Maison de la Mécanique, 39/41 rue Louis Blanc, 92400 Courbevoie, France(FR)
Abstract
A Direct Numerical Simulation database of a realistic swirl burner is analyzed to provide novel Large-Eddy Simulation closures. The swirl burner features a flow Reynolds number of 40,000 and a turbulent Reynolds number of 1,400, and is operated with a lean air/methane mixture at a constant flow rate. The DNS is performed with a 2.6-billion cell unstructured mesh that leads to a resolution of 0.1 mm. The LES analysis is carried out from two angles: modeling of flux terms entering the balance equation for the reaction progress variable, and modeling of the subgrid-scale scalar variance
