罗坤a; 郑友取b; 樊建人a; 岑可法a
LUO Kuna; ZHENG Youqub; FAN Jianrena; CEN Kefaa
摘要: In order to understand the interaction between large-scale vortex structure and particles,
a two-waycoupling temporal mixing layer laden with particles at a Stokes number of 5 with
different mass loading plantedinitially in the upper half region is numerically studied.
The pseudospectral method is used for the flow fluid andthe Lagrangian approach is employed
to trace particles. The momentum coupling effect introduced by a particle isapproximated to
a point force. The simulation results show that the coherent structures are still dominant
in themixing layer, but the large-scale vortex structure and particle dispersion are
modulated. The length of large-scalevortex structure is shortened and the pairing is
delayed. At the same time, the particles are distributed more evenlyin the whole flow field
as the mass loading is increased, but the particle dispersion along the transverse
directiondiffers from that along the spanwise direction, which indicates that the effect by
the addition of particle on thespanwise large-scale vortex structure is different from the
streamwise counterpart.