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We study the rheological response of dense suspensions of ellipticalparticles, with an aspect ratio equal to 3, under oscillatory shear flows andimposed pressure by numerical simulations. Like for the isotropic particles, wefind that the oscillatory shear flows respect the Cox-Merz rule at largeoscillatory strains but differ at low strains, with a lower viscosity than thesteady shear and higher shear jamming packing fractions. However, unlike theisotropic cases (i.e., discs and spheres), frictionless ellipses getdynamically arrested in their initial orientational configuration at smalloscillatory strains. We illustrate this by starting at two differentconfigurations with different nematic order parameters and the averageorientation of the particles. Surprisingly, the overall orientation in thefrictionless case is uncoupled to the rheological response close to jamming,and the rheology is only controlled by the average number of contacts and theoscillatory strain. Having larger oscillatory strains or adding friction does,however, help the system escape these orientational arrested states, which areevolving to a disordered state independent of the initial configuration at lowstrains and ordered ones at large strains.

Orientational arrest in dense suspensions of elliptical particles under oscillatory shear flows