本文由流体-颗粒速度的拉氏联合概率密度函数(PDF)输运方程出发,用Simonin建议的Langevin模型封闭颗粒所遇到流体瞬时速度的条件期望项,并用Monte Carlo方法直接求解PDF输运方程,将其和求解流体雷诺应力方程模型的有限差分方法结合,建立了雷诺应力-拉氏PDF(DSM-LPDF,简称DL)两相湍流模型.用此模型模拟了旋流数为0.47的突扩旋流气粒两相流动,并与文献中PDPA实验和用类似于单相流动湍流模型封闭方法的时平均统一二阶矩(USM)模型的预报进行了对比.
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