OGS
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Kozeny-Carman equation.
\[ k = k_0 \left( \frac{1 - \phi_0}{1 - \phi} \right)^2 \left( \frac{\phi}{\phi_0} \right)^3, \]
where \(k\) is the permeability, \(k_0\) is the initial permeability, \(\phi\) is the porosity, and \(\phi_0\) is the initial porosity.
No additional info.
Used in no end-to-end test cases.