Hydrodynamically induced aggregation of two dimensional oriented active particles

Roee Bashan, Naomi Oppenheimer

Research output: Contribution to journalArticlepeer-review


We investigate a system of co-oriented active particles interacting only via hydrodynamic and steric interactions in a two-dimensional fluid. We offer a new method of calculating the flow created by any active particle in such a fluid, focusing on the dynamics of flow fields with a high-order spatial decay, which we analyze using a geometric Hamiltonian. We show that when the particles are oriented and the flow has a single, odd power decay, such systems lead to stable, fractal-like aggregation, with the only exception being the force dipole. We discuss how our results can easily be generalized to more complicated force distributions and to other effective two-dimensional systems.

Original languageEnglish
Pages (from-to)3901-3909
Number of pages9
JournalSoft Matter
Issue number19
StatePublished - 18 Mar 2024

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics


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