摘要
采用离散弹性元素-珠簧哑铃模型方程模拟了聚合物减阻流动.模拟出了高分子聚合物浓度的空间分布.得到了减阻率与粘弹性应力、雷诺应力等的定量关系.分析了聚合物湍流结构和离散弹性元素模型中弹性系数的关系.
A discrete-element model （spring-dumbbell model） was used to investigate the mechanism of drag reduction by addition of a small amount of polymer in a turbulent channel flow of Newtonian fluid by direct numerical simulation. By using the discrete-element model, the spatial concentration of the polymer can be obtained numerically. The quantitative relation between the drag reduction rate and viscoelastic shear stress and Reynolds shear stress etc. were obtained. Discussions were performed to clarify the relation between the turbulent structure of the polymer drag reducing flow and the spring coefficient of the discrete-element model.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第4期617-620,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No．50506017)
教育部科学技术研究重点项目(No．106034)
高等学校博士学科点专项科研基金(No．20050425006)
关键词
珠簧哑铃模型
直接数值模拟
减阻
槽道湍流
spring-dumbbell model
direct numerical simulation
drag reduction
turbulent channel flow
