Falkinhoff F, Obligado M, Bourgoin M, Mininni P D
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, & IFIBA, CONICET, Ciudad Universitaria, Buenos Aires 1428, Argentina.
Université Lyon, Ens de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, 46 all ée dItalie, F-69342 Lyon, France.
Phys Rev Lett. 2020 Aug 7;125(6):064504. doi: 10.1103/PhysRevLett.125.064504.
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.
我们提出了一种用于在重力作用下由湍流输运的重粒子的扫棒机制。直接数值模拟表明，这些粒子优先探索拉格朗日加速度接近零的流动区域。然而，粒子聚集处流体元素的实际拉格朗日加速度并不为零，并且与斯托克斯数、重力加速度以及粒子的沉降速度有关。
