Reinforcement learning of optimal active particle navigation

M Nasiri, B Liebchen - New Journal of Physics, 2022 - iopscience.iop.org
The development of self-propelled particles at the micro-and the nanoscale has sparked a
huge potential for future applications in active matter physics, microsurgery, and targeted …

Optimizing low-Reynolds-number predation via optimal control and reinforcement learning

G Zhu, WZ Fang, L Zhu - Journal of Fluid Mechanics, 2022 - cambridge.org
We seek the best stroke sequences of a finite-size swimming predator chasing a non-motile
point or finite-size prey at low Reynolds number. We use optimal control to seek the globally …

Hydrodynamically induced helical particle drift due to patterned surfaces

DL Chase, C Kurzthaler… - Proceedings of the …, 2022 - National Acad Sciences
Advances in microfabrication enable the tailoring of surfaces to achieve optimal sorting,
mixing, and focusing of complex particulate suspensions in microfluidic devices. Corrugated …

A meticulous friction torque model for a lubricated ball screw considering the surface roughness

Y Zhang, C Zhou, H Feng - Tribology International, 2023 - Elsevier
This study proposes a meticulous friction torque model considering both the asperity
interaction and fluid traction mechanisms in micro-scale physical analysis. The fractal theory …

3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy

M Panahi, R Jamali, VF Rad, M Khorasani, A Darudi… - Scientific Reports, 2021 - nature.com
In several phenomena in biology and industry, it is required to understand the
comprehensive behavior of sedimenting micro-particles in fluids. Here, we use the …

Steady azimuthal flow field induced by a rotating sphere near a rigid disk or inside a gap between two coaxially positioned rigid disks

A Daddi-Moussa-Ider, AR Sprenger, T Richter… - Physics of …, 2021 - pubs.aip.org
Geometric confinements play an important role in many physical and biological processes
and significantly affect the rheology and behavior of colloidal suspensions at low Reynolds …

Microswimmers near corrugated, periodic surfaces

C Kurzthaler, HA Stone - Soft matter, 2021 - pubs.rsc.org
We explore hydrodynamic interactions between microswimmers and corrugated, or rough,
surfaces, as found often in biological systems and microfluidic devices. Using the Lorentz …

Slow motion of a sphere near a sinusoidal surface

G Li - Journal of Fluid Mechanics, 2023 - cambridge.org
Particle motion near non-plane surfaces can exhibit intricate hydrodynamics, making it an
attractive tool for manipulating particles in microfluidic devices. To understand the …

Asymmetric Stokes flow induced by a transverse point force acting near a finite-sized elastic membrane

A Daddi-Moussa-Ider - Journal of the Physical Society of Japan, 2020 - journals.jps.jp
A deep understanding of the physical interactions between nanoparticles and target cell
membranes is important in designing efficient nanocarrier systems for drug delivery …

Transport of a passive scalar in wide channels with surface topography: An asymptotic theory

JV Roggeveen, HA Stone… - Journal of Physics …, 2023 - iopscience.iop.org
We generalize classical dispersion theory for a passive scalar to derive an asymptotic long-
time convection–diffusion equation for a solute suspended in a wide, structured channel and …