Dynamic characteristics of a deformable capsule in a simple shear flow

Jingtao Ma, Lincheng Xu, Fang-Bao Tian, John Young, and Joseph C. S. Lai
Phys. Rev. E 99, 023101 – Published 7 February 2019

Abstract

The dynamic characteristics of a two-dimensional deformable capsule in a simple shear flow are studied with an immersed boundary-lattice Boltzmann method. Simulations are conducted by varying the Reynolds number (Re) from 0.0125 to 2000 and the dimensionless shear rate (G) from 0.001 to 0.5. The G-Re plane can be divided into four regions according to the deformation dependence on the parameters considered: viscous dominant, inertia dominant, transitional, and anomalous regions. There are four typical dynamic behaviors over the G-Re plane: steady deformation, prerupture state, quasisteady deformation, and continuous elongation. Analysis indicates that the pressure distribution and its variations due to the interplay of the fluid inertia force, the viscous shear stress, and the membrane elastic force determines the complex behaviors of the capsule. The effects of the bending rigidity and the internal-to-external viscosity ratio on the dynamics of the capsule are further studied. It is found that the capsule experiences smaller deformation when the higher bending rigidity is included, and the low bending rigidity does not have a remarkable influence on the capsule deformation. The capsule normally experiences smaller deformation due to the increase of the internal-to-external viscosity ratio.

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  • Received 29 April 2018
  • Revised 25 December 2018

DOI:https://doi.org/10.1103/PhysRevE.99.023101

©2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsPhysics of Living Systems

Authors & Affiliations

Jingtao Ma, Lincheng Xu, Fang-Bao Tian*, John Young, and Joseph C. S. Lai

  • School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia

  • *Corresponding author: f.tian@adfa.edu.au; onetfbao@gmail.com

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Issue

Vol. 99, Iss. 2 — February 2019

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