Regensburg 2025 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 17: Poster Session II

BP 17.5: Poster

Dienstag, 18. März 2025, 18:00–20:30, P4

The Dynamics of Spatiotemporal Self-organization in Active Turbulence — •Henri Jörn Schmidt — Max-Planck institute for self-organisation and dynamics, Göttingen, Germany

Spontaneous pattern formation in nature has been subject to extensive research in recent decades, with more and more emphasis being put on the dynamics of their creation processes.

In this work we investigate coherent structures in fluid flows. Specifically, this work concentrates on eddy currents found in the turbulent regime of active nematics. We analyse their formation and evolution as well as how their dynamics is affected by the cross-talk between different length scales. In doing so, we introduce a new methodology to record the overlaps of eluded structures in an agent-based approach. This allows for size changes in individual structures without inflicting biases in the computed intersection ratios.

Our results seem to indicate no particular cascade of different length scales. However, we do observe an universal evolution of the eddy currents, marked by a pronounced growing and shrinking phase. Usually, these stages take place within an encapsulating parent structure. Likewise, as the eddies have attained their nominal size, they give rise to new eluded structures themselves. These dynamics seem to be independent from both, the size ratio of clusters and their elapsed life time.

Keywords: active turbulence; active matter; hydrodynamics; energy cascade; eddy currents