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Simulating dynamics of ellipsoidal particles using lattice Boltzmann method.

Sumesh P Thampi1, Kevin Stratford2, Oliver Henrich3

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This study introduces a robust lattice Boltzmann method for simulating anisotropic particles in fluids. The new algorithm accurately models particle movement and orientation, crucial for understanding complex fluid dynamics.

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Area of Science:

  • Soft Matter Physics
  • Complex Fluids
  • Computational Fluid Dynamics

Background:

  • Anisotropic particles are prevalent in soft matter and complex fluid systems.
  • Accurate simulation of particle hydrodynamics is essential for understanding these systems.

Purpose of the Study:

  • To implement a coupled hydrodynamics simulation for solid ellipsoidal particles and surrounding fluid.
  • To develop a stable and robust algorithm for updating particle position and orientation.

Main Methods:

  • Utilized the lattice Boltzmann method for fluid simulation.
  • Implemented a link-based mechanism for solid-fluid boundary conditions.
  • Developed an implicit method using quaternions for dynamic updates of ellipsoid position and orientation.

Main Results:

  • Validated the algorithm through four distinct scenarios: translational velocity, inclined drift, rotational motion (Jeffrey's orbits), and microswimmer self-propulsion.
  • Achieved good agreement between numerical results and analytical solutions across various fluid properties and geometric parameters.

Conclusions:

  • The proposed algorithm demonstrates robustness and accuracy in simulating anisotropic particle hydrodynamics.
  • This method provides a reliable tool for studying complex fluid systems involving ellipsoidal particles.