Continuum Modeling and Numerical Simulation of Active Suspensions in Curved Channels

IF 2.8 3区工程技术 Q2 MECHANICS

Theoretical and Computational Fluid Dynamics Pub Date : 2025-08-19 DOI:10.1007/s00162-025-00752-2

Houssem Ben Gozlen, Yongqi Wang, Martin Oberlack

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Abstract

This paper presents a two-fluid model to simulate the behavior of uniformly oriented active suspensions in curved annular channels. Active suspensions consist of self-propelled particles suspended in a fluid that exhibit complex collective behavior through interactions with their surrounding environment. The proposed model captures key interactions between the fluid and particle phases, including drag and lift forces, and allows the analysis of flow patterns and particle distributions. The study investigates the flow of active suspensions in an annular channel with a rectangular cross-section, where stable secondary flow patterns develop, characterized notably by Dean vortices. Numerical simulations are used to examine the effects of channel curvature and aspect ratio on the dynamics of these suspensions. Results reveal that increased curvature intensifies the formation of Dean vortices, which significantly affect the particle distribution. Additionally, larger aspect ratios increase the strength of the secondary flow and enhance particle segregation. Model comparison to direct numerical simulations shows a qualitatively good agreement in predicting particle distribution profiles.

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弯曲河道主动悬架的连续体建模与数值模拟

本文提出了一种双流体模型来模拟均匀定向主动悬架在弯曲环形通道中的行为。主动悬架由悬浮在流体中的自推进粒子组成，这些粒子通过与周围环境的相互作用表现出复杂的集体行为。所提出的模型捕获了流体和颗粒相之间的关键相互作用，包括阻力和升力，并允许分析流动模式和颗粒分布。该研究研究了主动悬液在矩形截面环形通道中的流动，在环形通道中，稳定的二次流模式发展，其特征是Dean涡。数值模拟研究了通道曲率和纵横比对这些悬架动力学的影响。结果表明，增大的曲率加剧了Dean涡的形成，对颗粒分布有显著影响。此外，较大的展弦比增加了二次流的强度，并增强了颗粒的偏析。模型与直接数值模拟的比较表明，在预测颗粒分布剖面方面具有较好的一致性。

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来源期刊

Theoretical and Computational Fluid Dynamics 物理-力学

CiteScore

5.80

自引率

2.90%

发文量

审稿时长

>12 weeks

期刊介绍： Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.