Direct numerical simulation of the two-way coupled interaction between particles and mixing layer

摘要

It is well known that large-scale vortex structures dominate the dispersion of particles at intermediate Stokes numbers in three-dimensional shear flows. Understanding the two-way momentum coupling effects in such flows is very important for practical applications. Using a pseudo-spectral method and a Lagrangian approach, the effects of two-way moment;mn coupling on three-dimensional particle-laden mixing layers are studied. It is found that fur particles at an intermediate Stokes number, higher mass loading results in lower energy of the large-scale vortex structures and less particle dispersion. While particles at intermediate Stokes numbers stabilize the flow, particles at small Stokes numbers at; a particular mass loading tend to destabilize the flow and enhance the mixing. The presence of particles suppresses the flow energy at low wavenumbers and enhances the flow energy at high wavenumbers. [References: 41]