arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.05956physics.flu-dyncs.NAmath.NA
收藏

Hele-Shaw盒中电场作用下粘性指进的数值研究

Numerical study on viscous fingering using electric fields in a Hele-Shaw cell

Meng Zhao, Pedro Anjos, John Lowengrub, Wenjun Ying, Shuwang Li

摘要:

研究了Hele-Shaw盒中运动界面在面内电场作用下的非线性动力学行为。我们开发了一种谱精确的边界积分方法,其中制定了耦合积分方程组。虽然由于高阶空间导数的刚度可以被移除,但是长时间的模拟仍然是昂贵的,因为随着界面的扩展,界面的演化速度急剧下降。我们通过采用重新缩放方案来消除这种物理上强加的刚度,这加速了缓慢的动力学并降低了计算成本。我们的非线性结果表明,正电流抑制手指分枝,促进整体稳定的模式。另一方面,负电流使界面更不稳定,并导致形成连接手指和小内部区域的薄尾部结构。当没有磁通注入,并利用负电流时,界面倾向于接近原点并分裂成几滴。我们研究了界面到原点的最小距离随时间的演化,发现它服从一个代数规律$\displaystyle (t_*-t)^b$,其中$t_*$是夹断时间的估计。

英文摘要:

We investigate the nonlinear dynamics of a moving interface in a Hele-Shaw cell subject to an in-plane applied electric field. We develop a spectrally accurate boundary integral method where a coupled integral equation system is formulated. Although the stiffness due to the high order spatial derivatives can be removed, the long-time simulation is still expensive since the evolving velocity of the interface drops dramatically as the interface expands. We remove this physically imposed stiffness by employing a rescaling scheme, which accelerates the slow dynamics and reduces the computational cost. Our nonlinear results reveal that positive currents restrain finger ramification and promote overall stabilization of patterns. On the other hand, negative currents make the interface more unstable and lead to the formation of thin tail structures connecting the fingers and a small inner region. When no flux is injected, and a negative current is utilized, the interface tends to approach the origin and break up into several drops. We investigate the temporal evolution of the smallest distance between the interface and the origin and find that it obeys an algebraic law $\displaystyle (t_*-t)^b$, where $t_*$ is the estimated pinch-off time.

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。

↑