抄録
A new model for large eddy simulation(LES) of premixed combustion has been proposed and tested in the present paper. The model is based on the G-equation, in which a level set method and the dynamic subgrid model of turbulent flame speed are incorporated. The mathematical feature of the filtered G-equation in the present formulation is consistent with that of the original one due to the introduction of the level set method. Therefore, discontinuity in hydrodynamic quantities across corrugated flames can be properly captured. In addition, the turbulent flame speed can be computed dynamically as a part of the calculation by modifying its procedure in conjunction with the level set method. For comparison, numerical simulations by two different G-equation models have been also conducted. It is found that the level set approach to the G-equation is effective to prevent the thin flame from broadening. It is also confirmed that the subgrid turbulent intensity is one of the most important factors in modeling the turbulent flame speed.
