三维气固两相混合层湍流拟序结构的直接数值模拟

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。

DIRETCT NUMERICAL SIMULATION IN TURBULENT COHERENT STRUCTURES OF THREE-DIMENSIONAL GAS-PARTICLE TWO-PHASE MIXING LAYER

Direct numerical simulation is employed to study the coherent structures in a three-dimensional gas-solid two-phase mining layer in this paper. N-S equations in now 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 temporally evolving miking 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 particle dispersion patterns by three-dimensional large-scale vortex structures.