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P: Fachverband Plasmaphysik

P 16: Complex Plasmas and Dusty Plasmas II

P 16.4: Vortrag

Mittwoch, 2. April 2025, 17:00–17:15, ZHG006

Three-dimensional FTLE analysis of fluid dusty plasmas under weightlessness — •Andre Melzer, Christina Knapek, Daniel Maier, Daniel Mohr, and Stefan Schütt — Institute of Physics, University of Greifswald

We have performed experiments on dusty plasmas under the weightlessness conditions of parabolic flights where the dust particles form an extended homogeneous dust cloud. The particle trajectories have been recorded using a four-camera stereoscopic camera system. From that, the three-dimensional particle trajectories have been determined using both a machine-learning particle reconstruction technique and the deterministic shake-the-box algorithm. From the trajectories, fluid parameters, flow fields and finite-time Lyapunov exponent (FTLE)-based fluid structures have been calculated and analyzed. The FTLE analysis indicates that the fluid behavior changes during the course of the parabola. Furthermore, it is demonstrated that the machine-learning based approach allows to reliably characterize the dynamic states by comparison with the shake-the-box algorithm.

Keywords: Weightlessness; Parabolic flights; Stereoscopy; Machine learning