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A complete theoretical presentation of the Continuum-mechanical, AnisotropicFlow model, based on an anisotropic Flow Enhancement factor (CAFFE model) isgiven. The CAFFE model is an application of the theory of mixtures withcontinuous diversity for the case of large polar ice masses in which inducedanisotropy occurs. The anisotropic response of the polycrystalline ice isdescribed by a generalization of Glen's flow law, based on a scalar anisotropicenhancement factor. The enhancement factor depends on the orientation massdensity, which is closely related to the orientation distribution function anddescribes the distribution of grain orientations (fabric). Fabric evolution isgoverned by the orientation mass balance, which depends on four distincteffects, interpreted as local rigid body rotation, grain rotation, rotationrecrystallization (polygonization) and grain boundary migration (migrationrecrystallization), respectively. It is proven that the flow law of the CAFFEmodel is truly anisotropic despite the collinearity between the stress deviatorand stretching tensors.

Continuum-mechanical, Anisotropic Flow model for polar ice masses, based on an anisotropic Flow Enhancement factor