摘要
针对由Giesekus本构方程描述的粘弹性槽道减阻流动,建立了低Re数雷诺应力模型。通过与DNS数据的比较,该模型对平均速度、平均变形、减阻率和应力的预测较准确,而对时均速度剖面和脉动速度强度的预测精度有待提高。另外,对雷诺应力再分配项(压强变形率相关项)的模化有待改进。
A low Re number Reynolds-stress model was presented based on a drag reducing flow in a channel described by the Giesekus constitutive equation. Through comparing with the results of DNS, it is confirmed that the proposed model can correctly predict some variables such as the mean velocity, mean conformations, drag reduction rate and mean stresses; whereas the prediction accuracy of the mean velocity profiles and the root mean square velocity fluctuations needs to be improved. On the other hand, the modeling of Reynolds-stress redistribution term （or pressure-strain correlation） still needs modification.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第4期611-614,共4页
Journal of Engineering Thermophysics
基金
高等学校博士学科点专项科研基金(No.20050425006)
教育部科学技术研究重点项目(No.106034)
教育部留学回国人员基金
国家自然科学基金(No.50876114No.50506017No.10602043)
关键词
雷诺应力模型
湍流模型
减阻
粘弹性
Reynolds-stress model
the turbulence model
drag-reduction
viscoelasticity
