  We formulate and apply a continuum model that incorporates elasticity, yield
stress, plasticity and viscous drag. It is motivated by the two-dimensional
foam rheology experiments of Debregeas et al. [G. Debregeas, H. Tabuteau, and
J.-M. di Meglio, Phys. Rev. Lett. 87, 178305 (2001)] and Wang et al [Y. Wang,
K. Krishan, and M. Dennin, Phys. Rev. E 73, 031401 (2006)], and is successful
in exhibiting their principal features an exponentially decaying velocity
profile and strain localisation. Transient effects are also identified.
