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 Subsubsection 4.9.3.1: Constant Isotropic Diffusivity Up Subsection 4.9.3: Diffusivity Materials Subsubsection 4.9.3.3: Referentially Isotropic Diffusivity 

4.9.3.2 Constant Orthotropic Diffusivity

The material type for constant orthotropic diffusivity materials is “diff-const-ortho”. The following material parameters must be defined:
<free_diff> free diffusivity of solute (diffusivity in solution) [L /t]
<diff> diffusivities along orthogonal directions ( [L /t]
When the permeability is orhotropic, where are orthonormal vectors normal to the planes of symmetry (defined as described in Section 4.1.1↑). For this material model, 's are constant. Therefore this model should be used only when strains are small. Note that the user must specify , since a solute cannot diffuse through the biphasic-solute mixture faster than in free solution.
Example:
<diffusivity name="Permeability" type="diff-const-ortho">
  <free_diff>0.005</free_diff >
  <diff>0.002,0.001,0.003</diff>
</diffusivity>


 Subsubsection 4.9.3.1: Constant Isotropic Diffusivity Up Subsection 4.9.3: Diffusivity Materials Subsubsection 4.9.3.3: Referentially Isotropic Diffusivity