水利学报Issue(1)：67-72,82,7.
水体紊动对黏性泥沙絮凝影响研究
The effects of turbulence on flocculation of cohesive sediments
摘要
Abstract
The flocculation and settling of cohesive sediment in turbulence play an important role on the co⁃hesive sediment transport in estuaries and coastal waters. A three-dimensional numerical model of settling and flocculation of cohesive sediment in the homogenous isotropic turbulence using lattice Boltzmann meth⁃od is developed to investigate the effects of turbulence on the flocculation phenomena of cohesive sediment. It can be seen that with increasing shear rate the start time of the floc formation will be earlier firstly and then be later. Furthermore,it also can be concluded that with increasing shear rate the settling velocity of flocs first increases,then decreases. The turning point of shear rate is 200s-1,which is consistent with the observation. Simulation results show that the low turbulent shear rates have role in promoting on floccula⁃tion processes and the opposite trend at high shear rates properly.关键词
均匀各向同性紊流/黏性泥沙/絮凝/紊动剪切率/格子玻尔兹曼方法Key words
homogenous isotropic turbulence/cohesive sediment/flocculation/turbulent shear rate/Lat-tice Boltzmann method分类
建筑与水利引用本文复制引用
张金凤,张庆河,乔光全..水体紊动对黏性泥沙絮凝影响研究[J].水利学报,2013,(1):67-72,82,7.基金项目
国家自然科学基金资助项目(50909071) （50909071）
国家自然科学基金创新研究群体科学基金资助项目(51021004) （51021004）
