平板混合层流动中两相脉动关联矩的大涡模拟

LARGE EDDY SIMULATION OF TURBULENCE MODULATION TERM IN MIXING LAYER TWO-PHASE FLOW

在气粒两相平板混合层流动中,对气相流动采用大涡模拟,对颗粒相流动采用轨道模拟,研究了两相脉动关联矩。由两相各自瞬时速度出发可以直接获得两相脉动关联矩的统计结果。模拟获得的颗粒相一阶矩、二阶矩以及两相脉动关联矩与实验结果定量符合,表明基于细观模拟是不通过模型获得和研究两相脉动关联矩的可行途径。

The plane mixing layer gas-particle flows are numerically investigated by using larger eddy simulation for gas phase and trajectory model for particle phase, and the turbulence modulation term is then obtained directly by statistical method without using any closure model. The predicted results of particle phase, including first moments, second moments and turbulence modulation term agree well with experiment data. It can be concluded that the model-free methods in this paper for getting the turbulence modulation term are a feasible way.