Turbulent breakage of ductile aggregates.
Turbulent breakage of ductile aggregates.
复制标题
韧性骨料的湍流破碎。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Soldati
中科院分区：
文献类型：
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作者：
C. Marchioli;A. Soldati
本文研究了非均匀各向异性湍流中小胶体聚集体的破碎率统计。我们使用伪谱直接数值模拟湍流通道流动和拉格朗日跟踪来跟踪聚合体的运动，模拟为亚柯尔莫哥罗夫无质量粒子。我们特别关注延性破裂所产生的影响：当波动的水动应力超过临界值σ>σ(cr)时，这种破裂开始被激活，当骨料吸收的能量达到临界破裂值时，这种破裂就结束了。我们发现，相对于瞬时脆性断裂（即在σ>σ(cr)发生断裂）的情况，延性断裂断裂率显著降低。这些差异是由于所研究的各向异性湍流中不同的能量值以及能量分布的统计特征造成的。
In this paper we study breakage rate statistics of small colloidal aggregates in nonhomogeneous anisotropic turbulence. We use pseudospectral direct numerical simulation of turbulent channel flow and Lagrangian tracking to follow the motion of the aggregates, modeled as sub-Kolmogorov massless particles. We focus specifically on the effects produced by ductile rupture: This rupture is initially activated when fluctuating hydrodynamic stresses exceed a critical value, σ>σ(cr), and is brought to completion when the energy absorbed by the aggregate meets the critical breakage value. We show that ductile rupture breakage rates are significantly reduced with respect to the case of instantaneous brittle rupture (i.e., breakage occurs as soon as σ>σ(cr)). These discrepancies are due to the different energy values at play as well as to the statistical features of energy distribution in the anisotropic turbulence case examined.
影响因子：
3.7
作者：
Hamlington, P. E.;Krasnov, D.;Schumacher, J.
通讯作者：
Schumacher, J.