摘要
大涡模拟方法是介于传统雷诺平均方法和直接数值模拟方法之间的一种数值计算方法,其基本思想是通过滤波把流场中所有变量分成大尺度和小尺度量,对大尺度量进行直接求解,小尺度量采用亚格子模型进行模化处理。综述了近年来大涡模拟方法在搅拌反应器领域的研究进展,主要包括大涡模拟的数值方法、亚格子模型、桨叶旋转运动的处理技术及其在湍流特性、宏观不稳定、混合时间及多相流等方面的具体运用。阐明了大涡模拟方法较传统雷诺平均方法的优势,指出大涡模拟今后研究的重点方向为搅拌反应器内复杂多相流体系。
The large eddy simulation（LES）approach is an intermediate method between traditional Reynolds Averaged Navier-Stokes（RANS）approaches and direct numerical simulation（DNS）method.The filtered governing equations are used in LES,and large eddies are resolved directly while small eddies are modeled.The research progress of LES in stirred reactors in the last decade is reviewed.The numerical methods,subgrid scale models,impeller modeling techniques and their applications on turbulence,macro-instability,mixing time and multiphase flow are mainly focused.Comparing with RANS approach,the prediction results are substantially improved by LES approach.And more attentions should be paid on complex multiphase flow of stirred reactors by using LES in the near future.
出处
《机械设计与制造》
北大核心
2011年第6期86-88,共3页
Machinery Design & Manufacture
关键词
大涡模拟
搅拌反应器
计算流体力学
Large eddy simulation
Stirred reactor
Computational fluid dynamics
