@Article{CiCP-16-56,
author = {John Gounley and Yan Peng},
title = {Shape Recovery of Elastic Capsules from Shear Flow Induced Deformation},
journal = {Communications in Computational Physics},
year = {2014},
volume = {16},
number = {1},
pages = {56--74},
abstract = {<p style="text-align: justify;">Red blood cells undergo substantial shape changes in vivo. Modeled as
a viscoelastic capsule, their deformation and equilibrium behavior has been extensively studied. We consider how 2D capsules recover their shape, after having been
deformed to &#39;equilibrium&#39; behavior by shear flow. The fluid-structure interaction is
modeled using the multiple-relaxation time lattice Boltzmann (LBM) and immersed
boundary (IBM) methods. Characterizing the capsule&#39;s shape recovery with the Taylor deformation parameter, we find that a single exponential decay model suffices to
describe the recovery of a circular capsule. However, for biconcave capsules whose
equilibrium behaviors are tank-treading and tumbling, we posit a two-part recovery,
modeled with a pair of exponential decay functions. We consider how these two recovery modes depend on the capsule&#39;s shear elasticity, membrane viscosity, and bending
stiffness, along with the ratio of the viscosity of the fluid inside the capsule to the ambient fluid viscosity. We find that the initial recovery mode for a tank-treading biconcave capsule is dominated by shear elasticity and membrane viscosity. On the other
hand, the latter recovery mode for both tumbling and tank-treading capsules, depends
clearly on shear elasticity, bending stiffness, and the viscosity ratio.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.220513.151113a},
url = {http://global-sci.org/intro/article_detail/cicp/7033.html}
}