Vortex behavior in the inertial flow of viscoelastic fluids past a confined cylinder
Vortex behavior in the inertial flow of viscoelastic fluids past a confined cylinder
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粘弹性流体通过受限圆柱体的惯性流中的涡流行为
DOI：
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发表时间：
2004
影响因子：
1.3
通讯作者：
S. J. Lee
中科院分区：
文献类型：
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作者：
Ju Min Kim;Chongyoup Kim;C. Chung;K. Ahn;S. J. Lee
本文研究了分子参数对惯性粘弹性圆柱绕流中定常涡行为的影响。本构方程采用FENE-CR模型。最近开发的迭代求解方法（Kim等人，(in Press））被发现成功地适用于惯性粘弹性流动的计算。采用基于ILU（0）型预处理器和BiCGSTAB方法的高效迭代求解方法，进行了高分辨率计算，以了解详细的流动行为。采用离散弹性粘性分裂应力-G/流线迎风PetrovGalerkin（DEVSS-G/SUPG）方法作为稳定化方法。随着弹性的增加，涡的尺寸减小。然而，在大延伸率的情况下也观察到了涡增强，这意味着涡行为强烈依赖于材料参数。纵向正应力梯度对涡的形成有阻碍作用，而拉伸粘性对涡的增强起作用。本文的研究结果将有助于理解粘弹性流体绕流受限圆柱的惯性涡动力学。
The effect of molecular parameters on the steady vortex behaviors in the inertial viscoelastic flow past a cylinder has been investigated. FENE-CR model was considered as a constitutive equation. A recently developed iterative solution method (Kim et al., (in press)) was found to be successfully applicable to the computation of inertial viscoelastic flows. The high-resolution computations were carried out to understand the detailed flow behaviors based on the efficient iterative solution method armed with ILU(0) type pre-conditioner and BiCGSTAB method. The discrete elastic viscous split stress-G/streamline upwind Petrov Galerkin (DEVSS-G/SUPG) formulation was adopted as a stabilization method. The vortex size decreased as elasticity increases. However, the vortex enhancement was also observed in the case of large extensibility, which means that the vortex behavior is strongly dependent upon the material parameters. The longitudinal gradient of normal stress was found to retard the formation of vortex, whereas the extensional viscosity played a role in the vortex enhancement. The present results are expected to be helpful for understanding the inertial vortex dynamics of viscoelastic fluids in the flow past a confined cylinder.