gstatrandomfield.hh

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#ifndef DUMUX_GSTAT_RANDOM_FIELD_HH
#define DUMUX_GSTAT_RANDOM_FIELD_HH
 
#include <iostream>
 
#include <dune/grid/common/mcmgmapper.hh>
#include <dune/grid/io/file/vtk.hh>
 
namespace Dumux {

template<class GridView, class Scalar>
class GstatRandomField
{
    enum { dim = GridView::dimension };
    enum { dimWorld = GridView::dimensionworld };
 
    using DataVector = std::vector<Scalar>;
    using Element = typename GridView::Traits::template Codim<0>::Entity;
    using ElementMapper = Dune::MultipleCodimMultipleGeomTypeMapper<GridView>;
 
public:
    // Add field types if you want to implement e.g. tensor permeabilities.
    enum FieldType { scalar, log10 };

    GstatRandomField(const GridView& gridView, const ElementMapper& elementMapper)
    : gridView_(gridView)
    , elementMapper_(elementMapper)
    , data_(gridView.size(0))
    {}

    void create(const std::string& gstatControlFile,
                const std::string& gstatInputFile = "gstatInput.txt",
                const std::string& gstatOutputFile = "permeab.dat",
                FieldType fieldType = FieldType::scalar,
                bool createNew = true)
    {
        fieldType_ = fieldType;
        if (createNew)
        {
#if !HAVE_GSTAT
            DUNE_THROW(Dune::InvalidStateException, "Requested data field generation with gstat"
              << " but gstat was not found on your system. Set GSTAT_ROOT to the path where gstat "
              << " is installed and pass it to CMake, e.g. through an opts file.");
#else
            std::ofstream gstatInput(gstatInputFile);
            for (const auto& element : elements(gridView_))
                // get global coordinates of cell centers
                gstatInput << element.geometry().center() << std::endl;
 
            gstatInput.close();
 
            std::string syscom;
            syscom = GSTAT_EXECUTABLE;
            syscom += " ";
            syscom += gstatControlFile;
 
            if (!gstatInput.good())
            {
                DUNE_THROW(Dune::IOError, "Reading the gstat control file: "
                             << gstatControlFile << " failed." << std::endl);
            }
 
            if (system(syscom.c_str()))
            {
                DUNE_THROW(Dune::IOError, "Executing gstat failed.");
            }
#endif
        }
 
        std::ifstream gstatOutput(gstatOutputFile);
        if (!gstatOutput.good())
        {
            DUNE_THROW(Dune::IOError, "Reading from file: "
                         << gstatOutputFile << " failed." << std::endl);
        }
 
        std::string line;
        std::getline(gstatOutput, line);
 
        Scalar trash, dataValue;
        for (const auto& element : elements(gridView_))
        {
            std::getline(gstatOutput, line);
            std::istringstream curLine(line);
            if (dim == 1)
                curLine >> trash >> dataValue;
            else if (dim == 2)
                curLine >> trash >> trash >> dataValue;
            else if (dim == 3)
                curLine >> trash >> trash >> trash >> dataValue;
            else
                DUNE_THROW(Dune::InvalidStateException, "Invalid dimension " << dim);
 
            data_[elementMapper_.index(element)] = dataValue;
        }
        gstatOutput.close();
 
        // post processing
        using std::pow;
        if (fieldType_ == FieldType::log10)
          std::for_each(data_.begin(), data_.end(), [](Scalar& s){ s = pow(10.0, s); });
    }

    Scalar data(const Element& e) const
    {
        return data_[elementMapper_.index(e)];
    }

    const DataVector& data() const
    {
        return data_;
    }

    void writeVtk(const std::string& vtkName,
                  const std::string& dataName = "data") const
    {
        Dune::VTKWriter<GridView> vtkwriter(gridView_);
        vtkwriter.addCellData(data_, dataName);
 
        DataVector logPerm;
        if (fieldType_ == FieldType::log10)
        {
            logPerm = data_;
            using std::log10;
            std::for_each(logPerm.begin(), logPerm.end(), [](Scalar& s){ s = log10(s); });
            vtkwriter.addCellData(logPerm, "log10 of " + dataName);
        }
        vtkwriter.write(vtkName, Dune::VTK::OutputType::ascii);
    }
 
private:
    const GridView gridView_;
    const ElementMapper& elementMapper_;
    DataVector data_;
    FieldType fieldType_;
};
 
} // end namespace Dumux
 
#endif