Regularized representation of bacterial hydrodynamics

Kenta Ishimoto, Eamonn A. Gaffney, Benjamin J. Walker

Research output: Contribution to journalArticlepeer-review

9 Citations (SciVal)


Fluid flows induced by a flagellated bacterial swimmer are often modeled as a simple force dipole, valid in the far field. Such representations neglect the inherent rotation of these bacteria as they swim, driven by a spinning helical flagellum or fascicle. Here, we present a refined swimmer representation that makes use of regularized singularities, retaining simplicity while capturing details of the complex flow field near the swimmer that have previously been absent from basic models. We illustrate the significance of this representation via a study of bacterial predator-prey dynamics, highlighting the importance of detailed hydrodynamics in models of bacterial interactions and bacterial active matter.

Original languageEnglish
Article number093101
JournalPhysical Review Fluids
Issue number9
Publication statusPublished - 8 Sept 2020

Bibliographical note

Funding Information:
B.J.W. is supported by the UK Engineering and Physical Sciences Research Council (EPSRC), Grant No. EP/N509711/1. K.I. is supported by JSPS-KAKENHI for Young Researchers (Grant No. 18K13456), JST, and PRESTO Grant No. JPMJPR1921. Elements of the numerical simulations were performed within the cluster computer system at the Research Institute for Mathematical Sciences (RIMS) and Institute for Information Management and Communication (IIMC), Kyoto University.

Publisher Copyright:
© 2020 authors.

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Fluid Flow and Transfer Processes


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