freeflow/navierstokes/iofields.hh

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#ifndef DUMUX_NAVIER_STOKES_IO_FIELDS_HH
#define DUMUX_NAVIER_STOKES_IO_FIELDS_HH
 
#include <dumux/common/parameters.hh>
#include <dumux/io/name.hh>
 
namespace Dumux {
 
template<class IOFields, class PrimaryVariables, class ModelTraits, class FluidSystem>
std::function<std::string(int,int)> createCellCenterPVNameFunction(const std::string& paramGroup = "")
{
    static constexpr auto offset = ModelTraits::numEq() - PrimaryVariables::dimension;
 
    if (hasParamInGroup(paramGroup, "LoadSolution.CellCenterPriVarNames"))
    {
        const auto pvName = getParamFromGroup<std::vector<std::string>>(paramGroup, "LoadSolution.CellCenterPriVarNames");
        return [n = std::move(pvName)](int pvIdx, int state = 0){ return n[pvIdx]; };
    }
    else
        // add an offset to the pvIdx so that the velocities are skipped
        return [](int pvIdx, int state = 0){ return IOFields::template primaryVariableName<ModelTraits, FluidSystem>(pvIdx + offset, state); };
}
 
template<class IOFields, class PrimaryVariables, class ModelTraits, class FluidSystem>
std::function<std::string(int,int)> createFacePVNameFunction(const std::string& paramGroup = "")
{
    if (hasParamInGroup(paramGroup, "LoadSolution.FacePriVarNames"))
    {
        const auto pvName = getParamFromGroup<std::vector<std::string>>(paramGroup, "LoadSolution.FacePriVarNames");
        return [n = std::move(pvName)](int pvIdx, int state = 0){ return n[pvIdx]; };
    }
    else
        // there is only one scalar-type primary variable called "v" living on the faces
        return [](int pvIdx, int state = 0){ return IOFields::template primaryVariableName<ModelTraits, FluidSystem>(pvIdx , state); };
}
 
// forward declare
template<class T, class U>
class StaggeredVtkOutputModule;
 
class NavierStokesIOFields
{
    template<class T>
    struct isStaggered : public std::false_type {};
 
    template<class... Args>
    struct isStaggered<StaggeredVtkOutputModule<Args...>>
    : public std::true_type {};
 
public:
    template <class OutputModule>
    static void initOutputModule(OutputModule& out)
    {
        out.addVolumeVariable([](const auto& v){ return v.pressure(); }, IOName::pressure());
        out.addVolumeVariable([](const auto& v){ return v.density(); }, IOName::density());
 
        // add discretization-specific fields
        additionalOutput_(out, isStaggered<OutputModule>());
    }
 
    template <class ModelTraits, class FluidSystem = void>
    static std::string primaryVariableName(int pvIdx = 0, int state = 0)
    {
        if (pvIdx < ModelTraits::dim())
            return "v";
        else
            return IOName::pressure();
    }
 
private:
 
    template <class OutputModule>
    static void additionalOutput_(OutputModule& out, std::false_type)
    { }
 
    template <class OutputModule>
    static void additionalOutput_(OutputModule& out, std::true_type)
    {
        const bool writeFaceVars = getParamFromGroup<bool>(out.paramGroup(), "Vtk.WriteFaceData", false);
        if(writeFaceVars)
        {
            auto faceVelocityVector = [](const auto& scvf, const auto& faceVars)
                                      {
                                          using VelocityVector = std::decay_t<decltype(scvf.unitOuterNormal())>;
 
                                          VelocityVector velocity(0.0);
                                          velocity[scvf.directionIndex()] = faceVars.velocitySelf();
                                          return velocity;
                                      };
 
            out.addFaceVariable(faceVelocityVector, "faceVelocity");
 
            auto faceNormalVelocity = [](const auto& faceVars)
                                      {
                                          return faceVars.velocitySelf();
                                      };
 
            out.addFaceVariable(faceNormalVelocity, "v");
        }
    }
};
 
} // end namespace Dumux
 
#endif