本文对三维气固两相混合层湍流拟序结构进行了直接数值模拟。气相流场应用拟谱方法对N-S方程组进行直接求解，通过模拟时间模式的混合层流动，分析流场失稳后涡的卷起、配对、合并及撕裂过程，研究三维混合层湍流拟序结构的演变特征；计算颗粒场时，采用Lagrangian方法，针对颗粒不同的Stokes数，模拟了颗粒场的瞬态分布，并分析流场三维大涡结构对颗粒分布的影响。
Direct numerical simulation is employed to study the coherent structures in athree-dimensional gas-solid two-phase mixing layer in this paper. N-Sequations in flow field are directly solved using a pseudospectral method. The process of of vortex rolling, paring, amalgamation and avulsion after the loss of stability are analyzed by the simulation of emporally evolving mixing layer, and the evolving characteristics of coherent structure are also studied. The temporal distributions of particles with different Stokes numbers are simulated using the Lagrangian approach. The analysis shows the effects on particledis persion patterns by three-dimensional large-scale vortex structures.
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