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Steady, Laminar Flow Between Parallel Plates01:17

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Hydrodynamic interaction between two nonspherical capsules in shear flow.

Duc-Vinh Le1, K-H Chiam

  • 1A*STAR Institute of High Performance Computing, Singapore, Singapore. ledv@ihpc.a-star.edu.sg

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 21, 2011
PubMed
Summary

The shape of capsules significantly influences their interaction in fluid flow. Oblate and biconcave capsules exhibit unique swapping and rotation behaviors not seen in spherical capsules.

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Area of Science:

  • Fluid Dynamics
  • Biophysics
  • Computational Science

Background:

  • Understanding cellular interactions in flow is crucial for biological processes.
  • Red blood cells, modeled as capsules, exhibit complex behaviors in circulation.
  • Hydrodynamic forces dictate particle movement and interaction in fluid environments.

Purpose of the Study:

  • To investigate the hydrodynamic interactions between two nonspherical capsules in simple shear flow.
  • To analyze the influence of capsule shape (spherical, oblate spheroidal, biconcave) on interaction dynamics.
  • To explore the effects of shear rate and initial separation on capsule trajectories.

Main Methods:

  • Numerical simulations using a front-tracking method.
  • Modeling capsules with thin elastic shells, considering in-plane tensions and bending moments.
  • Parametric studies across various dimensionless shear rates and initial separations.

Main Results:

  • Spherical capsules in shear flow either cross over or exhibit spiraling motion.
  • Capsule interaction dynamics are strongly dependent on their unstressed shapes.
  • Oblate and biconcave capsules display additional swapping and continuous rotation interactions during tumbling.

Conclusions:

  • Capsule shape is a critical determinant of hydrodynamic interaction patterns.
  • Non-spherical capsule behaviors, like swapping and rotation, emerge from specific flow conditions and tumbling.
  • These findings contribute to understanding cell dynamics in microcirculation and other shear-driven flows.