LES of buoyant turbulent convection in a vertical slot based on a novel dynamic nonlinear sub-grid-scale model

A nonlinear sub-grid-scale (SGS) stress model based on a quadratic constitutive relation developed previously for the RANS approach is introduced in large eddy simulation (LES) of turbulent thermal flows. This model is combined with a linear and nonlinear SGS heat flux model, and applied to LES of combined forced and natural turbulent convection in a vertical slot with two differentially heated side walls. The prediction for the resolved-scale fields is compared to that based on a dynamic Smagorinsky model (DM), as well as DNS results. The combination of nonlinear SGS models yields improved predictions compared to those of conventional linear models. (authors)