Thesis
Numerical investigation of lattice Boltzmann-immersed boundary method for fluid structure interaction problems
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2026
- Thesis identifier
- T18212
- Person Identifier (Local)
- 201881465
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- The prominence of fluid-solid interactions problems in industrial applications and natural processes determines a necessity for accurate and efficient simulation strategies. Because such problems are challenging to model with conventional methods and require extensive computational resources, the immersed boundary lattice Boltzmann method (IB-LBM) provides a promising alternative. Diffuse-interface IB-LBM approaches owe their popularity to the efficient implementation and the ability to suppress numerical oscillations in moving boundary problems. However, the diffuse interface alters the representation of the fluid-solid boundary and affects the accuracy of the flow field calculation. The present work investigates the diffusive effects of IBM for surface-confined particulate flows by comparing results with sharp-interface methods and explores mitigation strategies. It is found that increasing confinement and close particle–particle interactions, particularly when interfaces overlap, accentuate interface diffusion and decrease simulation accuracy. To minimise diffusive effects, a boundary retraction scheme is implemented and its effectiveness is examined. It is shown that this strategy reduces interface diffusion errors and increases accuracy while limiting computational costs. The fluid-solid coupling strategy is a critical aspect of IB-LBM formulations, as it influences numerical stability. It is demonstrated that weakly coupled schemes impose a limitation on the fluid-solid density ratio to achieve stable simulations. To address this problem, a strongly coupled formulation is implemented. The internal-mass effect is analysed, coupling strategies are compared, and the stability limits are identified. The simulations of falling and rising particles capture the dynamics of light structures and provide insight into the influence of structural properties, geometrical confinement, and local flow field. The study of vortex-induced vibrations investigates the synchronisation regime, the oscillation amplitudes, and the influence of the critical mass ratio on the structural response. These results advance the understanding of physical and numerical mechanisms and demonstrate the potential of IB–LBM for studying particle-laden flows and flow-induced vibrations.
- Advisor / supervisor
- Walker, Maria
- Resource Type
- DOI
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PDF of thesis T18212 | 2026-10-20 | Public | Download |