Computing equilibrium states of cholesteric liquid crystals in elliptical channels with deflation algorithms

Computing equilibrium states of cholesteric liquid crystals in elliptical channels with deflation algorithms
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用紧缩算法计算椭圆通道中胆甾液晶的平衡状态

DOI:
10.1080/02678292.2017.1365385
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发表时间:
2017
期刊:
影响因子:
2.2
通讯作者:
Atherton, Timothy J.
Atherton, Timothy J.
中科院分区:
化学3区
文献类型:
--
作者:
Emerson, David B.;Farrell, Patrick E.;Adler, James H.;MacLachlan, Scott P.;Atherton, Timothy J.

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本文研究限制在椭圆通道中的双折射液晶问题。该系统在几何上是不理想的,这是因为螺旋体倾向于采用均匀的扭转变形率,但椭圆域排除了这一点。通过层的变形或引入缺陷来解决挫折,从而产生特别丰富的平衡构型家族。为了确定的解决方案集,我们适应和应用一个新的家庭的算法,称为通货紧缩的方法,迭代修改的自由能极值问题,删除以前已知的解决方案。第二个算法,放气延续,用于跟踪解决方案分支的功能的纵横比的椭圆和首选间距的椭圆。
We study the problem of a cholesteric liquid crystal confined to an elliptical channel. The system is geometrically frustrated because the cholesteric prefers to adopt a uniform rate of twist deformation, but the elliptical domain precludes this. The frustration is resolved by deformation of the layers or introduction of defects, leading to a particularly rich family of equilibrium configurations. To identify the solution set, we adapt and apply a new family of algorithms, known as deflation methods that iteratively modify the free energy extremisation problem by removing previously known solutions. A second algorithm, deflated continuation, is used to track solution branches as a function of the aspect ratio of the ellipse and preferred pitch of the cholesteric.
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