The astonishing behavior of non-convex grains in granular shear experiments

ORAL

Abstract

Granular material composed of regular tetrapods and hexapods is exposed to continuous shear in a split-bottom shear cell. We observe the generation of a secondary convective flow which is astonishingly opposite to that previously observed with cylinders and ellipsoids. The convective flow drags the particles at the surface towards the rotation center, where it is pulled downward, leaving a dimple in the center. The details of this phenomenon are extremely sensitive to the particle geometry and the height of the granular bed. We propose a hypothesis that explains this behavior qualitatively.

*This project received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 812638, CALIPER and from DLR within project EVA (50WM2048).

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Publication: M. Mohammadi et al., Phys. Rev. E (letter), in press
Mohammadi et al., arxiv.org/2208.04142

Presenters

  • Ralf Stannarius

    • Otto von Guericke University Magdeburg

Authors

  • Ralf Stannarius

    • Otto von Guericke University Magdeburg

  • Mahdieh Mohammadi

    • Technische Hochschule Brandenburg

  • Ahmed Ashour

    • Future University in Egypt

  • Dmitry Puzyrev

    • Otto von Guericke University Magdeburg

  • Torsten Trittel

    • Otto von Guericke University Magdeburg