SGER: Direct Numerical Simulation of Turbulent Drop Dispersion

[摘要]湍流液滴色散的直接数值模拟：液滴对湍流气体速度波动的响应是变形和耗散能量，形成复杂的相间耦合。过去几乎所有的努力都将粒子视为点，并从简单的固体-粒子相关性中确定阻力。目前的工作将通过前所未有的详细计算气体和液体行为，提供过去直接数值模拟工作中缺失的信息。所提出的工作将模拟液滴的良好分解，变形流体域。流体界面的确切位置将使用新颖的移动网格方法进行跟踪。液相和气相的每一个细节都将直接模拟，仅基于第一性原理。模拟将在pi的180 CPU Beowulf集群上并行运行。结果将显示真实液滴的复杂阻力行为如何与涡流、尾流涡度和附加耗散产生共振。最重要的是，液滴的运动将为理解湍流液滴分散提供有价值的数据。

ABSTRACTDIRECT NUMERICAL SIMULATION OF TURBULENT DROP DISPERSION David P. Schmidt and J. Blair PerotUniversity of Massachusetts-AmherstDroplets deform and dissipate energy in response to turbulent gas velocity fluctuations, creating complex interphase coupling. Nearly all past efforts have treated the particles as points and determined drag from simple solid-particle correlations. The current work will provide the information missing from past Direct Numerical Simulation efforts by calculating the gas and liquid behavior in unprecedented detail. The proposed work will simulate the droplets as well-resolved, deforming fluid domains. The exact location of the fluid interface will be tracked using novel moving-mesh methods. Every detail of the liquid and gas phases will simulated directly, based only on first principles. The simulations will be run in parallel on the P.I.s' 180 CPU Beowulf cluster. The results will show how the complex drag behavior of realistic droplets creates resonance with eddies, wake vorticity, and additional dissipation. Most importantly, the motion of the droplets will provide valuable data for understanding turbulent droplet dispersion.