SGER: Direct Numerical Simulation of Turbulent Drop Dispersion

湍流液滴扩散的数值模拟马萨诸塞州大学的David P.Schmidt和J.Blair Perott-AmherstDroplet因湍流气速波动而变形和耗散能量，产生复杂的相间耦合。过去几乎所有的研究都将颗粒视为点，并通过简单的固体颗粒关联来确定阻力。目前的工作将通过前所未有的详细计算气体和液体的行为来提供过去直接数值模拟工作中缺失的信息。这项拟议的工作将把液滴模拟为分辨率良好、变形的流体域。流体界面的准确位置将使用新的移动网格方法进行跟踪。液体和气相的每个细节都将直接模拟，仅基于第一原理。这些模拟将在P.I.S的180CPU 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旋、尾迹涡量和额外的耗散产生共鸣。最重要的是，液滴的运动将为理解湍流液滴的扩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.