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Simulations of monodisperse and polydisperse ($\mu_2(A)=0.13\pm0.002$) 2Dfoam samples undergoing simple shear are performed using the 2D Viscous Froth(VF) Model. These simulations clearly demonstrate shear localisation. Thedependence of localisation length on the product $\lambda V$ (shearing velocity$V$ times external wall friction coefficient $\lambda$) is examined and isshown to agree qualitatively with other published experimental data. A widerange of localisation lengths is found at low $\lambda V$, an effect which isattributed to the existence of distinct yield and limit stresses. The generalContinuum Model is extended to incorporate such an effect and its parametersare subsequently related to those of the VF Model. A Herschel-Bulkley exponentof $a=0.3$ is shown to accurately describe the observed behaviour. Thelocalisation length is found to be independent of $\lambda V$ for monodispersefoam samples.

Shear localisation with 2D Viscous Froth and its relation to the Continuum Model