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OGS
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The van Genuchten capillary pressure model.
The van Genuchten capillary pressure model ([42]) is:
p_c(S)=p_b (S_\text{eff}^{-1/m}-1)^{1-m}
with effective saturation defined as
S_\text{eff}=\frac{S-S_r}{S_{\text{max}}-S_r}.
Above, S_r and S_{\text{max}} are the residual and the maximum saturations. The exponent m \in (0,1) and the pressure scaling parameter p_b (it is equal to \rho g/\alpha in original publication) are given by the user. The scaling parameter p_b is given in same units as pressure.
In the original work another exponent n is used, but usually set to n = 1 / (1 - m), and also in this implementation.
The the capillary pressure is computed from saturation as above but is cut off at maximum capillary pressure given by user.
No additional info.
1.12.0