Unresolved stress tensor modelling in turbulent premixed V-flames using iterative deconvolution: An a priori assessment

International audience; The unresolved stress tensor in large-eddy simulations is an important unclosed term which affects the evolution of the resolved kinetic energy and consequently the evolution of large-scale motions. The literature on modeling this term for nonreacting flows is substantial but very scarce for turbulent flames and reacting flows with nonuniform density in general. The modeling assumptions in classic models are often strong even for nonreacting flows, which limits their range of applicability. In this study, a method using an iterative reconstruction algorithm is used in order to model the unresolved stress tensor for a highly demanding flow configuration which involves reaction, modeled using detailed chemistry, and mean shear. The evaluation of the method is conducted a priori using direct numerical simulation data, which are filtered and then sampled onto a coarser mesh. The performance of the method is compared against eight different classic models in the literature which include both static and dynamic formulations.