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An extensible lattice Boltzmann method for viscoelastic flows: complex and moving boundaries in Oldroyd-B fluids
Michael Kuron1, Cameron Stewart2, Joost de Graaf3
1Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569, Stuttgart, Germany. mkuron@icp.uni-stuttgart.de.
The European Physical Journal. E, Soft Matter
|February 8, 2021
Summary
We developed a new computational method for simulating viscoelastic fluids, enabling better understanding of complex flows with particles and boundaries. This tool aids research in areas like microswimmer dynamics.
Area of Science:
- Computational fluid dynamics
- Rheology
- Soft matter physics
Background:
- Biological fluids exhibit viscoelastic properties, combining fluid and solid-like behaviors.
- Existing computational models struggle with complex geometries and particle interactions in viscoelastic flows.
- Understanding these flows is crucial for fields like microfluidics and biophysics.
Purpose of the Study:
- To present a novel lattice Boltzmann solver for simulating Oldroyd-B viscoelastic fluids.
- To enable simulations with complex, arbitrarily shaped boundaries (fixed and moving).
- To provide a flexible platform for studying confined colloidal suspensions and microswimmers.
Main Methods:
- Developed a lattice Boltzmann solver specifically for Oldroyd-B fluids.
- Implemented robust handling of complex boundary conditions, including moving boundaries.
- Validated the solver against standard rheological tests and literature data for sedimenting colloids.
Main Results:
- The solver accurately simulates viscoelastic fluid flow in complex geometries.
- Validation studies confirmed good agreement with established rheological data.
- Demonstrated capability for simulating single sedimenting particles in viscoelastic media.
Conclusions:
- The developed lattice Boltzmann solver offers a powerful tool for viscoelastic flow simulation.
- Its ability to handle complex boundaries is ideal for confined colloidal suspensions.
- The method shows potential for advancing the study of microswimmers in viscoelastic environments.
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