Analysis of the number of topological defects in active nematic fluids under applied shear flow

IF 1.8 4区物理与天体物理 Q4 CHEMISTRY, PHYSICAL

The European Physical Journal E Pub Date : 2024-06-20 DOI:10.1140/epje/s10189-024-00437-4

Zhenna Li, Hao Ye, Jianzhong Lin, Zhenyu Ouyang

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Abstract

The number of topological defects in the shear flow of active nematic fluids is numerically investigated in this study. The evolution of the flow state of extensile active nematic fluids is explored by increasing the activity of active nematic fluids. Evidently, medium-activity active nematic fluids exhibit a highly ordered vortex lattice fluid state. However, high-activity active nematic fluids exhibit a meso-scale turbulent flow accompanied by topological defects. The number of topological defects (N_def) increases with increasing shear Reynolds number (Re_s). Fluid viscosity strongly influences N_def, while the influence of fluid density is relatively weak. N_def decreases with increasing activity length scale (l_ζ) value. A small Re_s value strongly influences N_def, whereas a large l_ζ value only weakly influences N_def. As the activity increases, N_def in contractile active nematic fluids becomes larger than that of extensile active nematic fluids.

Graphical abstract

Graphical abstract represents the flow state of meso-scale turbulent accompanied by topological defects. For the two dimensional case, two types of topological defects, namely comet-like + 1/2 and trefoil-like − 1/2 topological defects

Abstract Image

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分析外加剪切流下活性向列流体中拓扑缺陷的数量。

本研究对活性向列流体剪切流动中拓扑缺陷的数量进行了数值研究。通过提高活性向列流体的活性，探讨了延伸性活性向列流体流动状态的演变。显而易见，中等活度的活性向列流体表现出高度有序的涡流晶格流体状态。然而，高活性活性向列流体则表现出伴随拓扑缺陷的中尺度湍流。拓扑缺陷的数量（Ndef）随着剪切雷诺数（Res）的增加而增加。流体粘度对 Ndef 有很大影响，而流体密度的影响相对较弱。Ndef 随活动长度尺度 (lζ) 值的增加而减小。Res 值越小，对 Ndef 的影响越大，而 lζ 值越大，对 Ndef 的影响越小。随着活性的增加，收缩活性向列流体中的 Ndef 比延伸活性向列流体中的大。

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来源期刊

The European Physical Journal E CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

2.60

自引率

5.60%

发文量

审稿时长

3 months

期刊介绍： EPJ E publishes papers describing advances in the understanding of physical aspects of Soft, Liquid and Living Systems. Soft matter is a generic term for a large group of condensed, often heterogeneous systems -- often also called complex fluids -- that display a large response to weak external perturbations and that possess properties governed by slow internal dynamics. Flowing matter refers to all systems that can actually flow, from simple to multiphase liquids, from foams to granular matter. Living matter concerns the new physics that emerges from novel insights into the properties and behaviours of living systems. Furthermore, it aims at developing new concepts and quantitative approaches for the study of biological phenomena. Approaches from soft matter physics and statistical physics play a key role in this research. The journal includes reports of experimental, computational and theoretical studies and appeals to the broad interdisciplinary communities including physics, chemistry, biology, mathematics and materials science.