Theory Manual Version 3.4
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Subsection 5.7.5: Referentially Orthotropic Permeability Up Section 5.7: Hydraulic Permeability Section 5.8: Solute Diffusivity

### 5.7.6 Referentially Transversely Isotropic Permeability

This material uses a strain-dependent permeability tensor that is transversely isotropic in the reference configuration, and accommodates strain-induced anisotropy [7]: where is a second order tensor representing the spatial structural tensor describing the axial direction, given by and is a unit vector along the axial direction. Note that the permeability in the reference state () is given by .

Subsection 5.7.5: Referentially Orthotropic Permeability Up Section 5.7: Hydraulic Permeability Section 5.8: Solute Diffusivity