Abstract
A new computational scheme using Lagrangian model of the velocity and molecular mixing for the fluid particle is developed to calculate the reactive scalar field in grid generated turbulence. The model is composed of three parts. The Lagrangian velocity of fluid particle which carries the reacting species is generated by the Random Fourier Modes method. The molecular mixing model(the modified Curl's model)is used to calculate the mixing and diffusion of reactive concentration field, and the chemical reaction model is a second-order and irreversible reaction in the scalar mixing layer. It is shown that the simulated results of the first and second moments of reactive and productive species show the good agreements with of the experimental data.
