  Based on discrete element method simulations, we propose a new form of the
constitution equation for granular flows independent of packing fraction.
Rescaling the stress ratio $\mu$ by a power of dimensionless temperature
$\Theta$ makes the data from a wide set of flow geometries collapse to a master
curve depending only on the inertial number $I$. The basic power-law structure
appears robust to varying particle properties (e.g. surface friction) in both
2D and 3D systems. We show how this rheology fits and extends frameworks such
as kinetic theory and the Nonlocal Granular Fluidity model.
