Logistic fit
In addition to the previously introduced constitutive models for the relative permeability, we included a logistic fit function to capture the saturation dependence of the hydraulic conductivity. Note that this approach is pure curve fitting and has no physical interpretation. The relative permeability function of the pore water and pore air read
Therein
The input line for the Logistic fit model takes the following form:
*Relative permeability = Logistic-fit
k^w_min, k^a_min, chi, zeta
where
Theory
The contributions of to the Jacobian read:
The development of relative permeability