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首页> 外文期刊>AIChE Journal >Drag Force in Discrete Particle Models—Continuum Scale or Single Particle Scale?
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Drag Force in Discrete Particle Models—Continuum Scale or Single Particle Scale?

机译：离散粒子模型中的阻力—连续标度还是单粒子标度？

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摘要

Unresolved discrete particle (DP) models, where a Lagrangian method is used for the solid phase, and a Eulerian method for the fluid phase, have become increasingly popular. The fluctuations of the drag force on individual particles in a homogeneous random array obtained from fully resolved simulations using a lattice Boltzmann method were analysed; such fluctuations are by construction ignored in the unresolved DP model. The drag on individual particles in the array can differ up to 40% with the drag that would be used in DP type simulations was found. A detailed analysis shows that the drag on an individual particle depends strongly on all its surrounding neighbors within a distance of at least two particle diameters. As in DP models, the local flow field is unresolved, the conclusion is that this root mean square (RMS) deviation in the drag force is inherent to the model.
机译：在固相中使用拉格朗日方法，在液相中使用欧拉方法的未解析离散粒子（DP）模型已经越来越流行。分析了通过使用格子Boltzmann方法完全解析的模拟获得的均质随机阵列中单个粒子上的阻力波动。这种波动在未解决的DP模型中被构造忽略。与发现用于DP类型模拟的阻力相比，阵列中单个颗粒的阻力可能相差40％。详细的分析表明，单个粒子上的阻力在至少两个粒径范围内强烈依赖于其周围的所有相邻粒子。像在DP模型中一样，局部流场是无法解析的，结论是该拉力的均方根（RMS）偏差是模型固有的。

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