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Numerical Simulation of the Motion of Inextensible Capsules in Shear Flow Under the Effect of the Natural State

Published online by Cambridge University Press:  14 September 2015

Xiting Niu
Affiliation:
Department of Mathematics, University of Houston, Houston, TX 77204, USA
Lingling Shi
Affiliation:
Department of Mathematics, University of Houston, Houston, TX 77204, USA
Tsorng-Whay Pan*
Affiliation:
Department of Mathematics, University of Houston, Houston, TX 77204, USA
Roland Glowinski
Affiliation:
Department of Mathematics, University of Houston, Houston, TX 77204, USA
*
*Corresponding author. Email addresses: [email protected] (X. Niu), [email protected] (L. Shi), [email protected] (T.-W. Pan), [email protected] (R. Glowinski)
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Abstract

In this paper, a computational model for the natural state of an inextensible capsule has been successfully combined with a spring model of the capsule membrane to simulate the motion of the capsule in two-dimensional shear flow. Besides the viscosity ratio of the internal fluid and external fluid of the capsule, the natural state also plays a role for having the transition between two well known motions, tumbling and tank-treading (TT) with the long axis oscillates about a fixed inclination angle (a swinging mode), when varying the shear rate. Between tumbling and tank-treading, the intermittent behavior has been obtained for the capsule with a biconcave rest shape. The estimated critical value of the swelling ratio for having the intermittent transition behavior is less than 0.7, i.e., the capsules with rest shape closer to a full disk do not have the intermittent behavior in shear flow. The intermittent dynamics of the capsule in the transition region is a mixture of tumbling and TT with a swinging mode. Just like the motion of TT with a swing mode, which can be viewed as a tank-treading with an incomplete tumbling, the membrane tank-treads backward and forward within a small range during the tumbling motion.

Type
Research Article
Copyright
Copyright © Global-Science Press 2015 

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