  We use numerical simulations to study the shear-driven steady-state flow of
athermal, frictionless, overdamped, two dimensional cross-shaped particles of
varying aspect ratios, and make comparison with the behavior of rod-shaped and
staple-shaped particles. We find that the extent of non-convexity of the
particle shape plays an important role in determining both the value of the
jamming packing fraction as well as the rotational motion and orientational
ordering of the particles.
