Smart navigation of a gravity-driven glider with adjustable center of mass
Year: 2025
Type: article
Abstract: Artificial gliders are designed to disperse as they settle through a fluid, requiring precise navigation to reach target locations. We show that a compact glider settling in a viscous fluid can navigate by dynamically adjusting its center of mass. Using fully resolved direct numerical simulations and reinforcement learning, we find two optimal navigation strategies that allow the glider to reach its target location accurately. These strategies depend sensitively on how the glider interacts with the surrounding fluid. The nature of this interaction changes as the particle Reynolds number Re p changes. Our results explain how the optimal strategy depends on Re p . At large Re p , the glider learns to tumble rapidly by moving its center of mass as its orientation changes. This generates a large horizontal inertial lift force, which allows the glider to travel far. At small Re p , by contrast, high viscosity hinders tumbling. In this case, the glider learns to adjust its center of mass so that it settles with a steady, inclined orientation that results in a horizontal viscous force. The horizontal range is much smaller than for large Re p , because this viscous force is much smaller than the inertial lift force at large Re p .
Source: Physical Review Research
DOI: 10.1103/1r5c-qpng
Authors: X. Jiang, J. Qiu, K. Gustavsson, B. Mehlig, L. Zhao
Institutions: Tsinghua University, University of Gothenburg
Language: English
Topic: Micro and Nano Robotics
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
OpenAlex ID: W4416504168