The interaction between different phases (water and gas, water and oil
etc.) is important in many subsurface applications.
This includes natural processes like gas exchange between groundwater
and the saturated zone at the capillary fringe, the release of gases
produced under anaerobic conditions and water infiltration at high
precipitation rates. There are also many technical applications like the
remediation of contaminated ground, enhanced oil recovery and
carbon dioxide sequestration. Typical physical problems are phase
exchange, phase entrapment, hysteresis, determination and the
modeling of constitutive relationships.

We invite contributions addressing the experimental investigation and
simulation of multiphase flow from the pore to the landscape scale based
on fundamental as well as applied research.