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Updated: May 29, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Hydrodynamic scattering of a neutral squirmer by a near-wall curved obstacle: MPCD simulations and analytical theory
Prashant K Nagar1, Devandar Chauhan1, Harsh Pandey2,3
1Department of Physics, Malaviya National Institute of Technology Jaipur, India. kamakshi.phy@mnit.ac.in.
Abstract:
Microscopic swimming organisms exhibit a wide range of behaviours, including swarming, synchronized motion, and clustering, driven by hydrodynamic interactions with each other and the environment. Designing artificial microswimmers requires understanding the flow in constrained environments, such as microchannels or between obstacles. In this article, we explore the dynamics of a circular neutral squirmer near a curved wall-mounted obstacle. Using a multiparticle collision dynamics simulation, it is observed that the neutral squirmer always scatters from the obstacle. We measured the scattering angle from simulation, which agrees with analytical calculations based on Faxén's law and the far-field approximation. Further investigation reveals similarities to classical scattering with a repulsive potential.
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