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We use numerical simulations to study the flow of a bidisperse mixture ofathermal, frictionless, soft-core two dimensional spherocylinders driven inuniform steady state shear. Energy dissipation is via a viscous drag withrespect to a uniformly sheared host fluid, giving a model for a non-Browniansuspension with a Newtonian rheology. We study pressure $p$ and deviatoricshear stress $\sigma$ as a function of packing fraction $\phi$, strain rate$\dot\gamma$, and a parameter $\alpha$ that measures the asphericity of theparticles. We consider the anisotropy of the stress tensor, the macroscopicfriction $\mu=\sigma/p$, and the divergence of the transport coefficient$\eta_p=p/\dot\gamma$ as $\phi$ is increased to the jamming $\phi_J$. From ananalysis of Herschel-Bulkley rheology above jamming, we estimate $\phi_J$ as afunction of $\alpha$ and show that the variation of $\phi_J$ with $\alpha$ isthe main cause for differences in rheology as $\alpha$ is varied. However adetailed scaling analysis of the divergence of $\eta_p$ for our most elongatedparticles suggests that the jamming transition of spherocylinders may be in adifferent universality class than that of circular disks. We compute the numberof contacts per particle $Z$ in the system and show that at jamming $Z_J$ is anon-monotonic function of $\alpha$ that is always smaller than the isostaticvalue. We measure the probability distribution of contacts per unit surfacelength $\mathcal{P}(\vartheta)$ at polar angle $\vartheta$ with respect to thespherocylinder spine, and find that as $\alpha\to 0$ this distribution seems todiverge at $\vartheta=\pi/2$, giving a finite limiting probability for contactson the vanishingly small flat sides of the spherocylinder. Finally we considerthe variation of the average contact force as a function of location on theparticle surface.

Shear-Driven Flow of Athermal, Frictionless, Spherocylinder Suspensions in Two Dimensions: Stress, Jamming, and Contacts