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OGS
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OGS
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The van Genuchten capillary pressure model.
The van Genuchten capillary pressure model ([41]) 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