Lateral migration of a spherical capsule near a plane wall in Stokes flow.
Lateral migration is the motion of a particle perpendicular to the direction of the surrounding flow. One of the factors leading to the lateral migration of a deformable particle in Stokes flow is the presence of a nearby wall. We numerically investigate the lateral migration of a capsule in a near-wall simple shear flow using a boundary integral method coupled with a finite element method. We find that asymmetrical deformation of the capsule induced by the wall is correlated with a reduction in the lift velocity relative to the lift velocity predicted by a far-field analytical solution. A combination of this asymmetrical deformation, which decreases the lift velocity, and an increase in the value of the capsule stresslet near the wall, which works to increase the lift velocity, leads to a migration velocity that is nearly independent of capillary number and membrane constitutive law at large deformation near the wall.
Department of Biomedical Engineering, Tohoku University 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
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Department of Bioengineering and Robotics, Tohoku University 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
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Imai
Department of Bioengineering and Robotics, Tohoku University 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
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Matsunaga
Department of Biomedical Engineering, Tohoku University 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
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Yamaguchi
Department of Bioengineering and Robotics, Tohoku University 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.
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Ishikawa
D003198:Computer Simulation; D020342:Finite Element Analysis; D008962:Models, Theoretical; D009038:Motion