Two approaches exist to account for granular behavior. The thermal one considers the total entropy. which includes microscopic degrees of freedom such as phonons; the athermal one (as with the Edward entropy) takes grains as elementary. Granular solid hydrodynamics (GSH) belongs to the first. https://www.spidertattooz.com/AleSmith-Beachwood-Tower-of-Flower-IPA-Collaboration-4pk-16oz/