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Richards model does not support TwoPImmiscible fluid system

Bug report

What happened / Problem description: It fails to compile when the user decides to use the FluidSystems::TwoPImmiscible as fluid system in properties to a Richards problem due to the lack of index system. For example, if we use First, the default "volumevariables.hh" requires these index members, therefore, it would return following errors:

/DUMUX/dumux/dumux/porousmediumflow/richards/volumevariables.hh:132:40: error: no member named 'liquidPhaseIdx' in
      'Dumux::FluidSystems::TwoPImmiscible<double, Dumux::FluidSystems::OnePLiquid<double, Dumux::Components::SimpleH2O<double> >,
      Dumux::FluidSystems::OnePGas<double, Dumux::Components::TabulatedComponent<Dumux::Components::Air<double>, false> > >'
            massFraction_[FluidSystem::liquidPhaseIdx] = 1.0;

and error: no member named 'gasPhaseIdx' ...

This problem also occurs when the user implemented own volumevariables.hh, for richards/iofields.hh also needs the index members, it will return the following errors:

/DUMUX/dumux/dumux/porousmediumflow/richards/iofields.hh:49:74: error: no member named 'gasPhaseIdx' in
      'Dumux::FluidSystems::TwoPImmiscible<double, Dumux::FluidSystems::OnePLiquid<double, Dumux::Components::SimpleH2O<double> >,
      Dumux::FluidSystems::OnePGas<double, Dumux::Components::TabulatedComponent<Dumux::Components::Air<double>, false> > >'
        out.addVolumeVariable([](const auto& v){ return v.saturation(FS::gasPhaseIdx); }, ...

What you expected to happen: The Richards model is supposed to support TwoPImmiscible.

How to reproduce it (as minimally and precisely as possible): Try two constant components in the properties.hh for a Richards problem and compile:

using L = FluidSystems::OnePLiquid<double, Components::Constant<0,double> >;
using G = FluidSystems::OnePGas<double, Components::Constant<0,double> >;
using type = FluidSystems::TwoPImmiscible<Scalar, L, G>;

Anything else we need to know?:

Environment:

  • Dune version: 2.7
  • DuMux version: master
  • Others:
Edited by Timo Koch