Negative wake generation of FENE-CR fluids in uniform and Poiseuille flows past a cylinder
Negative wake generation of FENE-CR fluids in uniform and Poiseuille flows past a cylinder
复制标题
均匀和泊肃叶流过圆柱体的 FENE-CR 流体的负尾流生成
DOI：
10.1007/s00397-005-0442-7
复制
发表时间：
2005
期刊：
影响因子：
2.3
通讯作者：
S. J. Lee
中科院分区：
文献类型：
--
作者：
Ju Min Kim;Chongyoup Kim;C. Chung;K. Ahn;S. J. Lee
本文研究了流动条件对“负尾流”产生的影响（在沿中心线沿着流动的粘弹性流体中，圆柱体后的纵向速度过冲）。本构方程采用FENE-CR模型，该模型预测恒定剪切粘度和受控拉伸粘度。采用离散的弹性粘性分裂应力-G/流线迎风Petrov-Galerkin（DEVSS-G/SUPG）格式，利用基于不完全LU（0）型预条件子和BiCGSTAB的高效迭代求解器获得高分辨率解.结果表明，在均匀流条件下，Boger流体的“负尾流”产生比Poiffille流条件下更明显，这表明Boger流体的“负尾流”产生可能部分归因于Poiffille流的几何效应。在低延伸率和高粘度比下，“负尾流”的产生更加明显，这与前人的研究结果一致。此外，我们还观察到了泊松流条件下的下冲现象，这是从未有过的报道。
The effect of flow conditions on the “negative wake” generation (longitudinal velocity overshoot behind a cylinder in the viscoelastic fluid flow along the centerline) has been investigated. FENE-CR model that predicts constant shear viscosity and controlled extensional viscosity was considered as a constitutive equation. The discrete elastic viscous split stress-G/streamline upwind Petrov–Galerkin (DEVSS-G/SUPG) formulation was employed and the high-resolution solutions were obtained with an efficient iterative solver based on the incomplete LU(0)-type preconditioner and BiCGSTAB. We found that the “negative wake” generation was more obvious in uniform flow conditions than in Poiseuille flow, which suggests that the experimentally unrevealed “negative wake” generation of Boger fluids could be partially attributed to the geometrical effect of Poiseuille flow. The “negative wake” generation was more discernable at low extensibility and high value of viscosity ratio, which agrees well with the previous studies. In addition, we could observe an undershoot phenomenon in Poisseuille flow condition, which has never been reported.
DOI：
10.1137/0913035
发表时间：
1992-03-01
期刊：
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING
影响因子：
--
作者：
VANDERVORST, HA
通讯作者：
VANDERVORST, HA