Numerical Simulation for Diffusion of Matter in Plane Mixing Layer by Particle Method

A particle method for the diffusion of matter in free turbulent flow is applied to the calculation in a plane mixing layer. The flow field is simulated by a vortex method, and the diffusion of matter is calculated through a method analogous to the vortex method. The numerical result demonstrates that the particle method can indeed simulate the entrainment of matter into the shear layer due to the rotating motion of the large-scale eddies. The calculated mean concentration and fluctuation intensity indicate the self-similarities in accordance with the existing numerical results. It is also shown that the mixing asymmetry due to the large-scale eddies is successfully simulated.