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arXiv 1603.02142physics.flu-dyncond-mat.soft
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粘弹性液体的盖驱动空腔流

Lid-driven cavity flow of viscoelastic liquids

R. G. Sousa, R. J. Poole, A. M. Afonso, F. T. Pinho, P. J. Oliveira, A. Morozov, M. A. Alves

摘要:

盖驱动空腔流动是验证新的数值方法和技术的一个著名的基准问题。在实验和数值研究与粘弹性流体在这种盖驱动流,纯弹性不稳定性已被证明,甚至出现在非常低的雷诺数。有限体积粘弹性代码,使用的对数构象配方,在这项工作中使用的探索粘弹性的影响,在二维盖驱动腔的外观这样的不稳定性为宽范围的纵横比(0.125 <高度/长度< 4.0),在不同的德博拉数下的蠕变流动条件下,并了解盖速度的正则化的影响。粘弹性的影响的稳态结果和弹性不稳定性的发病的临界条件进行了描述,并与实验结果进行比较。

英文摘要:

The lid-driven cavity flow is a well-known benchmark problem for the validation of new numerical methods and techniques. In experimental and numerical studies with viscoelastic fluids in such lid-driven flows, purely-elastic instabilities have been shown to appear even at very low Reynolds numbers. A finite-volume viscoelastic code, using the log-conformation formulation, is used in this work to probe the effect of viscoelasticity on the appearance of such instabilities in two-dimensional lid-driven cavities for a wide range of aspect ratios (0.125 < height/length < 4.0), at different Deborah numbers under creeping-flow conditions and to understand the effects of regularization of the lid velocity. The effect of the viscoelasticity on the steady-state results and on the critical conditions for the onset of the elastic instabilities are described and compared to experimental results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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