gridmanager_mmesh.hh

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
//
// SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef DUMUX_IO_GRID_MANAGER_MMESH_HH
#define DUMUX_IO_GRID_MANAGER_MMESH_HH
 
#if HAVE_DUNE_MMESH
#include <dune/mmesh/mmesh.hh>
#endif
 
#ifndef DUMUX_IO_GRID_MANAGER_BASE_HH
#include <dumux/io/grid/gridmanager_base.hh>
#endif
 
namespace Dumux {
 
#if HAVE_DUNE_MMESH

template<int dim>
class GridManager<Dune::MovingMesh<dim>>
: public GridManagerBase<Dune::MovingMesh<dim>>
{
public:
    using Grid = Dune::MovingMesh<dim>;
    using ParentType = GridManagerBase<Grid>;

    void init(const std::string& modelParamGroup = "")
    {
        // First, try to create it from file
        if (hasParamInGroup(modelParamGroup, "Grid.File"))
        {
            ParentType::makeGridFromFile(getParamFromGroup<std::string>(modelParamGroup, "Grid.File"), modelParamGroup);
            ParentType::maybeRefineGrid(modelParamGroup);
            ParentType::loadBalance();
            return;
        }
 
        // Then look for the necessary keys to construct a structured grid from the input file
        else if (hasParamInGroup(modelParamGroup, "Grid.UpperRight"))
        {
            using GlobalPosition = Dune::FieldVector<typename Grid::ctype, dim>;
            const auto upperRight = getParamFromGroup<GlobalPosition>(modelParamGroup, "Grid.UpperRight");
            const auto lowerLeft = getParamFromGroup<GlobalPosition>(modelParamGroup, "Grid.LowerLeft", GlobalPosition(0.0));
 
            using CellArray = std::array<unsigned int, dim>;
            CellArray numCells; numCells.fill(1);
            numCells = getParamFromGroup<CellArray>(modelParamGroup, "Grid.Cells", numCells);
 
            // Insert uniformly spaced vertices
            std::array<unsigned int, dim> numVertices = numCells;
            for (int i = 0; i < dim; ++i)
              numVertices[i]++;
 
            Dune::MMeshImplicitGridFactory<Grid> factory;
 
            // Insert equally spaced vertices
            Dune::FactoryUtilities::MultiIndex<dim> index(numVertices);
            for (int i = 0; i < index.cycle(); ++i, ++index)
            {
              GlobalPosition pos(0);
              for (int j=0; j<dim; j++)
                pos[j] = lowerLeft[j] + index[j] * (upperRight[j]-lowerLeft[j])/(numVertices[j]-1);
 
              factory.insertVertex(pos);
            }
 
            this->gridPtr() = std::unique_ptr<Grid>(factory.createGrid());
            ParentType::maybeRefineGrid(modelParamGroup);
            ParentType::loadBalance();
        }
 
        // Didn't find a way to construct the grid
        else
        {
            const auto prefix = modelParamGroup.empty() ? modelParamGroup : modelParamGroup + ".";
            DUNE_THROW(ParameterException, "Please supply one of the parameters "
                                           << prefix + "Grid.UpperRight"
                                           << ", or a grid file in " << prefix + "Grid.File");
 
        }
    }
};
 
#endif // HAVE_DUNE_MMESH
 
} // end namespace Dumux
 
#endif