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Theory Manual Version 3.6
 Subsection 5.9.5: Referentially Orthotropic Permeability Up Section 5.9: Hydraulic Permeability Section 5.10: Solute Diffusivity 

5.9.6 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 [8]: 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 5.9.5: Referentially Orthotropic Permeability Up Section 5.9: Hydraulic Permeability Section 5.10: Solute Diffusivity