OGS

Temperature dependent model for some volume or mass fraction
This property must be a medium property. It can be used for media with a phase change of the fluid in the pore space. Then, there is a temperature dependent (volume or mass) fraction for one of the two phases. The other one is immediately given by the remaining fraction. The fraction is computed based on a phase transition spread over a temperature interval following a sigmoid line:
\[ \frac{\phi}{1 + \exp(k(T  T_\mathrm{c}))} \]
Parameter \(k\) controlling the steepness of the phase change and \(T_\mathrm{c}\) as the characteristic temperature where the phase change is centered around (melting temperature) are forwarded to a sigmoid function.
No additional info.
Used in no endtoend test cases.