Phase change in porous media

Hello,

I am modelling a geothermal system, where a porous rock is saturated with groundwater and heated by an intrusion of magma.

I have used 'Heat transfer in porous media' coupled with the 'Brinkmann equations' to simulate convection. However, I wish to include the phase change of the groundwater from liquid to steam within the porous rock.

Does anyone have experience with modelling a phase change of fluid in a porous medium, or have any ideas about how to do this?

Many thanks,
Hannah