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Subsection 4.8.2: Permeability Materials Up Subsection 4.8.2: Permeability Materials Subsubsection 4.8.2.2: Exponential Isotropic Permeability

#### 4.8.2.1 Constant Isotropic Permeability

The material type for constant isotropic permeability is “perm-const-iso”. The following material parameters must be defined:
 hydraulic permeability [L/Ft]
This isotropic material model uses the biphasic theory for describing the time-dependent material behavior of materials that consist of both a solid and fluid phase [44].
When the permeability is isotropic, For this material model, is constant. Generally, this assumption is only reasonable when strains are small.
Example:
<permeability name="Permeability" type="perm-const-iso">
<perm>0.001</perm>
</permeability>


Subsection 4.8.2: Permeability Materials Up Subsection 4.8.2: Permeability Materials Subsubsection 4.8.2.2: Exponential Isotropic Permeability