An Investigation on the Gas-solid Interactions in Periodically Excited Plane Mixing Layer by Using Vortex-in-Cell

The gas-solid interactions in a periodically excited plane mixing layer were investigated by vortex-in-cell technique. Transverse periodic forcing was posed on the initial location of plane mixing layer. Under the transverse periodic forcing, well organized spanwise Kelvin-Helmholtz rolls were formed. Not only the flow properties but the characteristics of particle dispersion and statistical properties of flow are detailed studied. In this study, Stoke number which bases on forcing frequency is chosen to be order one. Present results show that: solid particles always are impelled to the boundaries of vortex structures by centrifugal force, even though they ever temporally exist in the interior of vortex structures during pairing process; furthermore, the existence of solid particles in flow could enhance the forcing effects that make vortices evolve in flow field with more coherence in space and time; thus, negative turbulent production, which often appears in the highly excited plane mixing layer, could be observed in the present simulation at low forcing level and with solid particles.