论文标题
湍流中自由落体重颗粒的优先浓度
Preferential concentration of free-falling heavy particles in turbulence
论文作者
论文摘要
我们提出了一种在重力作用下由湍流转运的重颗粒的扫式机制。直接数值模拟表明，这些粒子优先探索流量的区域，接近零拉格朗日加速度。但是，颗粒积累的流体元素的实际拉格朗加加速度不是零，并且依赖于颗粒的stokes数，重力加速度和沉降速度。
We present a sweep-stick mechanism for heavy particles transported by a turbulent flow under the action of gravity. Direct numerical simulations show that these particles preferentially explore regions of the flow with close to zero Lagrangian acceleration. However, the actual Lagrangian acceleration of the fluid elements where particles accumulate is not zero, and has a dependence on the Stokes number, the gravity acceleration, and the settling velocity of the particles.
