Arrested labyrinths in active turbulence

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• Ricard Alert (Max-Planck-Institut für Physik komplexer Systeme, Dresden)
• Friday 14 June 2024, 10:20-11:10
• Seminar Room 1, Newton Institute.

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ADIW04 - Anti-Diffusion in Multiphase and Active Flows

Active fluids exhibit turbulent-like flows at low Reynolds numbers — a phenomenon known as active turbulence. I will show that, in defect-free active nematics, these chaotic flows can produce arrested patterns of nematic domain walls. These patterns enclose unicursal labyrinths — a type of labyrinth without bifurcations, which was common in Greek mythology. The domain walls bounding the labyrinth form a tree-like network which grows and gets locked into anchoring motifs reminiscent of locally-favoured structures in gels and glasses. Our results reveal a mechanism of pattern formation and dynamical arrest based on active turbulence. Our results also suggest a new perspective on topological defects: They not only drive but also enable active turbulence by avoiding the dynamical arrest that would take place in their absence.

This talk is part of the Isaac Newton Institute Seminar Series series.

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