LES of Turbulent Premixed Combustion Flow around Bluff Body Based on the G-equation with Dynamic Subgrid Model.

Abstract

LES of turbulent premixed flame stabilized by the bluff body is developed by using subgrid scale combustion model based on the G-equation describing the flame front propagation. The basic idea of LES modeling is to evaluate the filtered-front speed, which should be enhanced in the grid scale by the subgrid scale fluctuations of the flame surface. The dynamic subgrid scale models newly introduced into the G-equation are validated by the premixed combustion flow behind the triangle flame holder. The calculated results can predict the velocity and temperature of the combustion flow in good agreement with the experiment data.