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Newtonian fluid meets an elastic solid: coupling lattice Boltzmann and lattice-spring models
Gavin A Buxton1, Rolf Verberg, David Jasnow
1Chemical and Petroleum Engineering Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
Summary
We developed a new computational method combining lattice Boltzmann (LBM) and lattice spring (LSM) models to simulate fluid-filled elastic shells. This approach accurately captures shell-fluid interactions and their impact on surfaces.
Area of Science:
- Multiphysics simulation
- Computational fluid dynamics
- Soft matter physics
Background:
- Fluid-structure interaction is crucial in microcapsule behavior.
- Modeling coupled dynamics of enclosed fluids and elastic shells presents challenges.
Purpose of the Study:
- To develop an integrated computational framework for fluid-structure interaction in elastic shells.
- To investigate the dynamics of fluid-filled spherical shells, including their impact and surface adhesion.
Main Methods:
- Coupling the lattice Boltzmann model (LBM) for fluid dynamics with the lattice spring model (LSM) for elastic shell mechanics.
- Simulating the 'breathing mode' oscillations of a Newtonian fluid-filled spherical shell.
- Modeling the impact of the shell on hard and adhesive surfaces.
Main Results:
- The integrated LBM-LSM model accurately reproduces analytical solutions for shell oscillations.
- Simulations reveal sensitivity of capsule binding to surface properties based on shell and fluid characteristics.
- The method efficiently captures the dynamic coupling between fluid flow and compliant boundaries.
Conclusions:
- The integrated LBM-LSM approach provides an accurate and efficient tool for simulating fluid-filled elastic shells.
- Understanding these dynamics is vital for designing microcapsules in pharmaceutical and technological applications.
- Capsule adhesion is influenced by the interplay of shell and fluid properties.