Research interests

Microscale swimming

Investigation into the low Reynolds number swimming of flagellates, such as the boundary response of large-bodied Leishmania and the interactions between nearby spermatozoon. Publication in Physical Review Fluids regarding pairwise interactions of spermatozoa available here.

Filament mechanics

Efficient simulation of elastohydrodynamics in 2D and 3D, exploring the role and regulation of active moments in eukaryotic flagella in addition to the responses of filaments to flow. Publication in the Journal of Fluid Mechanics investigating filaments in a half-space available here.

Slender-body theory

Incorporation of non-uniform body shapes and curvatures into slender-body theories via asymptotic methods, enabling simple and rapid flow field computation and further theoretical study using regularised singularities. Publication in the Journal of Fluid Mechanics available here.

Flagellar analysis

Automated processing and identification of flagella from videomicroscopy, enabling population-level waveform analysis without requiring costly researcher input. Publication and ImageJ code for flagella capture freely available here.

Publications

  1. B. J. Walker, E. A. Gaffney. Regularised non-uniform segments and efficient no-slip elastohydrodynamics. Journal of Fluid Mechanics. In press. arXiv:2008.12339
  2. L. S. Kimpton, B. J. Walker, C. L. Hall, B. Bintu, D. Crosby, H. M. Byrne, A. Goriely (2021). A morphoelastic shell model of the eye. Journal of Elasticity.
  3. B. J. Walker, K. Ishimoto, E. A. Gaffney (2020). Efficient simulation of filament elastohydrodynamics in three dimensions. Physical Review Fluids. Full text.
  4. K. Ishimoto, E. A. Gaffney, B. J. Walker (2020). Regularized representation of bacterial hydrodynamics. Physical Review Fluids. Full text.
  5. B. J. Walker, M. P. Curtis, K. Ishimoto, E. A. Gaffney (2020). A regularised slender-body theory of non-uniform filaments. Journal of Fluid Mechanics. Full text.
  6. B. J. Walker, S. Phuyal, K. Ishimoto, C. Tung, E. A. Gaffney (2020). Computer-assisted beat-pattern analysis and the flagellar waveforms of bovine spermatozoa. Royal Society Open Science. Full text.
  7. B. J. Walker, K. Ishimoto, H. Gadêlha, E. A. Gaffney (2019). Filament mechanics in a half-space via regularised Stokeslet segments. Journal of Fluid Mechanics. Full text.
  8. B. J. Walker, K. Ishimoto, E. A. Gaffney (2019). The pairwise hydrodynamic interactions of synchronized spermatozoa. Physical Review Fluids. Full text.
  9. B. J. Walker, R. J. Wheeler (2019). High-speed multifocal plane fluorescence microscopy for three-dimensional visualisation of beating flagella. Journal of Cell Science. Full text.
  10. B. J. Walker, K. Ishimoto, R. J. Wheeler (2019). Automated identification of flagella from videomicroscopy via the medial axis transform. Scientific Reports. Full text.
  11. B. J. Walker, R. J. Wheeler, K. Ishimoto, E. A. Gaffney (2019). Boundary behaviours of Leishmania mexicana: A hydrodynamic simulation study. Journal of Theoretical Biology. Full text.
  12. B. J. Walker, R. J. Wheeler, K. Ishimoto, E. A. Gaffney (2018). Response of monoflagellate pullers to a shearing flow: A simulation study of microswimmer guidance. Physical Review E. Full text.

Preprints/Under review

  1. B. J. Walker, K. Ishimoto, E. A. Gaffney. Regularisation and Richardson extrapolation: refining regularised Stokeslets. In preparation.
  2. C. Moreau, K. Ishimoto, E. A. Gaffney, B. J. Walker. Control and controllability of microswimmers by a shearing flow. Under review.