湍流横掠固定颗粒的全尺度直接数值模拟

Direct numerical simulation of turbulent flows past stationary particles

气固两相流模拟中,当固相尺度接近或大于Kolmogorov尺度时,普通的点源模型将不再适用,固体相的体积效应和表面效应将对流体相产生显著的影响。通过采用直接数值模拟方法,结合内嵌边界方法对湍流中不同湍流强度流体横掠大于Kolmogorov尺度的固相颗粒进行了全尺度模拟,讨论分析了在两种湍流度下方形颗粒对湍流的调制影响以及颗粒的受力情况。

In simulating gas-solid multiphase flows,traditional point-particle model will not be applicable when the scale of the solid is beyond the Kolmogorov scale,for the surface and the volume effect will significantly affect the fluid phase.With DNS(direct numerical simulation)-immersed boundary method,flows with different turbulent intensities past a stationary cube particle larger than the turbulent Kolmogorov scale are simulated.The boundary effect exerted by the particle on the turbulence and the forces endured by the particle are analysed.