Scaling of Foam Flows near Jamming

We probe the scaling behavior of flows near the jamming transition of soft, viscous discs in a variant of the well known bubble-model for foams, where we assume that the viscous forces between contacting bubbles scale with the relative velocity with an adjustable exponent $\alpha$. This allows us to explore the non-trivial dependence of global flow exponents on the local exponent $\alpha$. Even though we find that elastic stresses dominate the global stresses in the system, the exponent $\alpha$ which governs the sub-dominant viscous interactions still sets the global scaling exponents.