Large-eddy simulation of natural convection in a vertical channel

Abstract

        Natural convection between two differently heated vertical walls is investigated by large-eddy simulation. In this study, the scale similarity model by Bardina et al. is used to reproduce the subgrid-scale (SGS) heat-flux vector in place of the gradient diffusion model. As a result, the Bardina model can reproduce the SGS heat flux in streamwise direction as accurately as an existing model does. But even the Bardina model cannot reproduce mean velocity. It is therefore necessary that the SGS stress tensor model should be also modified. [This abstract is not included in the PDF]