Please use this identifier to cite or link to this item: doi:10.22028/D291-28016
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Title: Vesicle dynamics in confined steady and harmonically modulated Poiseuille flows
Author(s): Boujja, Zakaria
Misbah, Chaouqi
Ez-Zahraouy, Hamid
Benyoussef, Abdelilah
John, Thomas
Wagner, Christian
Müller, Martin Michael
Title: Physical review
Volume: 98
Issue: 4
Startpage: 1
Endpage: 9
Publisher/Platform: APS
Year of Publication: 2018
Publikation type: Journal Article
Abstract: We present a numerical study of the time-dependent motion of a two-dimensional vesicle in a channel under an imposed flow. In a Poiseuille flow the shape of the vesicle depends on the flow strength, the mechanical properties of the membrane, and the width of the channel as reported in the past. This study is focused on the centered snaking (CSn) shape, where the vesicle shows an oscillatory motion like a swimmer flagella even though the flow is stationary. We quantify this behavior by the amplitude and frequency of the oscillations of the vesicle's center of mass. We observe regions in parameter space, where the CSn coexists with the parachute or the unconfined slipper. The influence of an amplitude modulation of the imposed flow on the dynamics and shape of the snaking vesicle is also investigated. For large modulation amplitudes transitions to static shapes are observed. A smaller modulation amplitude induces a modulation in amplitude and frequency of the center of mass of the snaking vesicle. In a certain parameter range we find that the center of mass oscillates with a constant envelope indicating the presence of at least two stable states.
DOI of the first publication: 10.1103/PhysRevE.98.043111
URL of the first publication:
Link to this record: hdl:20.500.11880/27451
ISSN: 2470-0045
Date of registration: 11-Jun-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Prof. Dr. Christian Wagner
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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