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中文摘要：
本文采用直接数值模拟方法结合拉格朗日跟踪方法研究平板边界层内涡旋与重颗粒的相互作用。模拟结果显示了由半球状粗糙元诱导产生的发夹涡沿流向的演化过程。小惯性的重颗粒在低压区上边缘的聚集阻碍了涡量的聚集并破坏了发夹涡的产生。模拟结果还证实颗粒在边界层内的输运主要受扫过和喷出事件的影响，且在边界层近壁区域内，扫过事件输运颗粒的能力强于喷出事件的。
英文摘要：
Direct numerical simulation （DNS） and Lagrangian particle-tracking approach were employed to simulate the interaction of particles and vortices in a flat-plate boundary layer. Simulated results showed the evolution of hairpin vortex induced by a hemispherical roughness element along the plate. Heavy particles with small inertia concentrate in the upper fringe of the low-pressure zone behind the hemisphere, hinder the process of vorticity concentration, and finally depress the shedding of hairpins effectively. Simulated results also proved that ejection and sweep events dominate the transport of particles in the boundary layer, and in the near-wall region, sweeps show stronger ability of transporting particles than ejections.
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