test_channel.cc

// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
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/*!
 * \file
 *
 * \brief Channel flow test for the staggered grid (Navier-)Stokes model
 */
 #include <config.h>

 #include <ctime>
 #include <iostream>

 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/timer.hh>
 #include <dune/grid/io/file/dgfparser/dgfexception.hh>
 #include <dune/grid/io/file/vtk.hh>
 #include <dune/istl/io.hh>

#include "channeltestproblem.hh"

#include <dumux/common/properties.hh>
#include <dumux/common/parameters.hh>
#include <dumux/common/valgrind.hh>
#include <dumux/common/dumuxmessage.hh>
#include <dumux/common/defaultusagemessage.hh>

#include <dumux/linear/seqsolverbackend.hh>
#include <dumux/nonlinear/newtonsolver.hh>

#include <dumux/assembly/staggeredfvassembler.hh>
#include <dumux/assembly/diffmethod.hh>

#include <dumux/discretization/methods.hh>

#include <dumux/io/staggeredvtkoutputmodule.hh>
#include <dumux/io/grid/gridmanager.hh>

#include <dumux/freeflow/navierstokes/staggered/fluxoversurface.hh>

/*!
 * \brief Provides an interface for customizing error messages associated with
 *        reading in parameters.
 *
 * \param progName  The name of the program, that was tried to be started.
 * \param errorMsg  The error message that was issued by the start function.
 *                  Comprises the thing that went wrong and a general help message.
 */
void usage(const char *progName, const std::string &errorMsg)
{
    if (errorMsg.size() > 0) {
        std::string errorMessageOut = "\nUsage: ";
                    errorMessageOut += progName;
                    errorMessageOut += " [options]\n";
                    errorMessageOut += errorMsg;
                    errorMessageOut += "\n\nThe list of mandatory arguments for this program is:\n"
                                        "\t-TimeManager.TEnd               End of the simulation [s] \n"
                                        "\t-TimeManager.DtInitial          Initial timestep size [s] \n"
                                        "\t-Grid.File                      Name of the file containing the grid \n"
                                        "\t                                definition in DGF format\n"
                                        "\t-SpatialParams.LensLowerLeftX   x-coordinate of the lower left corner of the lens [m] \n"
                                        "\t-SpatialParams.LensLowerLeftY   y-coordinate of the lower left corner of the lens [m] \n"
                                        "\t-SpatialParams.LensUpperRightX  x-coordinate of the upper right corner of the lens [m] \n"
                                        "\t-SpatialParams.LensUpperRightY  y-coordinate of the upper right corner of the lens [m] \n"
                                        "\t-SpatialParams.Permeability     Permeability of the domain [m^2] \n"
                                        "\t-SpatialParams.PermeabilityLens Permeability of the lens [m^2] \n";

        std::cout << errorMessageOut
                  << "\n";
    }
}

int main(int argc, char** argv) try
{
    using namespace Dumux;

    // define the type tag for this problem
    using TypeTag = TTAG(ChannelTestTypeTag);

    // initialize MPI, finalize is done automatically on exit
    const auto& mpiHelper = Dune::MPIHelper::instance(argc, argv);

    // print dumux start message
    if (mpiHelper.rank() == 0)
        DumuxMessage::print(/*firstCall=*/true);

    // parse command line arguments and input file
    Parameters::init(argc, argv, usage);

    // try to create a grid (from the given grid file or the input file)
    GridManager<typename GET_PROP_TYPE(TypeTag, Grid)> gridManager;
    gridManager.init();

    ////////////////////////////////////////////////////////////
    // run instationary non-linear problem on this grid
    ////////////////////////////////////////////////////////////

    // we compute on the leaf grid view
    const auto& leafGridView = gridManager.grid().leafGridView();

    // create the finite volume grid geometry
    using FVGridGeometry = typename GET_PROP_TYPE(TypeTag, FVGridGeometry);
    auto fvGridGeometry = std::make_shared<FVGridGeometry>(leafGridView);
    fvGridGeometry->update();

    // the problem (initial and boundary conditions)
    using Problem = typename GET_PROP_TYPE(TypeTag, Problem);
    auto problem = std::make_shared<Problem>(fvGridGeometry);

    // get some time loop parameters
    using Scalar = typename GET_PROP_TYPE(TypeTag, Scalar);
    const auto tEnd = getParam<Scalar>("TimeLoop.TEnd");
    const auto maxDt = getParam<Scalar>("TimeLoop.MaxTimeStepSize");
    auto dt = getParam<Scalar>("TimeLoop.DtInitial");

    // check if we are about to restart a previously interrupted simulation
    Scalar restartTime = 0;
    if (Parameters::getTree().hasKey("Restart") || Parameters::getTree().hasKey("TimeLoop.Restart"))
        restartTime = getParam<Scalar>("TimeLoop.Restart");

    // instantiate time loop
    auto timeLoop = std::make_shared<CheckPointTimeLoop<Scalar>>(restartTime, dt, tEnd);
    timeLoop->setMaxTimeStepSize(maxDt);
    problem->setTimeLoop(timeLoop);

    // the solution vector
    using SolutionVector = typename GET_PROP_TYPE(TypeTag, SolutionVector);
    const auto numDofsCellCenter = leafGridView.size(0);
    const auto numDofsFace = leafGridView.size(1);
    SolutionVector x;
    x[FVGridGeometry::cellCenterIdx()].resize(numDofsCellCenter);
    x[FVGridGeometry::faceIdx()].resize(numDofsFace);
    problem->applyInitialSolution(x);
    auto xOld = x;

    // the grid variables
    using GridVariables = typename GET_PROP_TYPE(TypeTag, GridVariables);
    auto gridVariables = std::make_shared<GridVariables>(problem, fvGridGeometry);
    gridVariables->init(x, xOld);

    // initialize the vtk output module
    using VtkOutputFields = typename GET_PROP_TYPE(TypeTag, VtkOutputFields);
    StaggeredVtkOutputModule<GridVariables, SolutionVector, typename GET_PROP_TYPE(TypeTag, VelocityOutput)> vtkWriter(*gridVariables, x, problem->name());
    VtkOutputFields::init(vtkWriter); //!< Add model specific output fields
    vtkWriter.write(0.0);

    // the assembler with time loop for instationary problem
    using Assembler = StaggeredFVAssembler<TypeTag, DiffMethod::numeric>;
    auto assembler = std::make_shared<Assembler>(problem, fvGridGeometry, gridVariables, timeLoop);

    // the linear solver
    using LinearSolver = Dumux::UMFPackBackend;
    auto linearSolver = std::make_shared<LinearSolver>();

    // the non-linear solver
    using NewtonSolver = Dumux::NewtonSolver<Assembler, LinearSolver>;
    NewtonSolver nonLinearSolver(assembler, linearSolver);

    // set up two surfaces over which fluxes are calculated
    FluxOverSurface<TypeTag> flux(*problem, *gridVariables, x);
    using GridView = typename GET_PROP_TYPE(TypeTag, GridView);
    using Element = typename GridView::template Codim<0>::Entity;

    using GlobalPosition = typename Element::Geometry::GlobalCoordinate;

    const Scalar xMin = fvGridGeometry->bBoxMin()[0];
    const Scalar xMax = fvGridGeometry->bBoxMax()[0];
    const Scalar yMin = fvGridGeometry->bBoxMin()[1];
    const Scalar yMax = fvGridGeometry->bBoxMax()[1];

    // The first surface shall be placed at the middle of the channel.
    // If we have an odd number of cells in x-direction, there would not be any cell faces
    // at the position of the surface (which is required for the flux calculation).
    // In this case, we add half a cell-width to the x-position in order to make sure that
    // the cell faces lie on the surface. This assumes a regular cartesian grid.
    const Scalar planePosMiddleX = xMin + 0.5*(xMax - xMin);
    const int numCellsX = getParam<std::vector<int>>("Grid.Cells")[0];
    const Scalar offsetX = (numCellsX % 2 == 0) ? 0.0 : 0.5*((xMax - xMin) / numCellsX);

    const auto p0middle = GlobalPosition{planePosMiddleX + offsetX, yMin};
    const auto p1middle = GlobalPosition{planePosMiddleX + offsetX, yMax};
    flux.addSurface("middle", p0middle, p1middle);

    // The second surface is placed at the outlet of the channel.
    const auto p0outlet = GlobalPosition{xMax, yMin};
    const auto p1outlet = GlobalPosition{xMax, yMax};
    flux.addSurface("outlet", p0outlet, p1outlet);

    // time loop
    timeLoop->start(); do
    {
        // set previous solution for storage evaluations
        assembler->setPreviousSolution(xOld);

        // solve the non-linear system with time step control
        nonLinearSolver.solve(x, *timeLoop);

        // make the new solution the old solution
        xOld = x;
        gridVariables->advanceTimeStep();

        // advance to the time loop to the next step
        timeLoop->advanceTimeStep();

        // write vtk output
        vtkWriter.write(timeLoop->time());

        // calculate and print mass fluxes over the planes
        flux.calculateMassOrMoleFluxes();
        if(GET_PROP_TYPE(TypeTag, ModelTraits)::enableEnergyBalance())
        {
            std::cout << "mass / energy flux at middle is: " << flux.netFlux("middle") << std::endl;
            std::cout << "mass / energy flux at outlet is: " << flux.netFlux("outlet") << std::endl;
        }
        else
        {
            std::cout << "mass flux at middle is: " << flux.netFlux("middle") << std::endl;
            std::cout << "mass flux at outlet is: " << flux.netFlux("outlet") << std::endl;
        }

        // calculate and print volume fluxes over the planes
        flux.calculateVolumeFluxes();
        std::cout << "volume flux at middle is: " << flux.netFlux("middle")[0] << std::endl;
        std::cout << "volume flux at outlet is: " << flux.netFlux("outlet")[0] << std::endl;

        // report statistics of this time step
        timeLoop->reportTimeStep();

        // set new dt as suggested by newton solver
        timeLoop->setTimeStepSize(nonLinearSolver.suggestTimeStepSize(timeLoop->timeStepSize()));

    } while (!timeLoop->finished());

    timeLoop->finalize(leafGridView.comm());

    ////////////////////////////////////////////////////////////
    // finalize, print dumux message to say goodbye
    ////////////////////////////////////////////////////////////

    // print dumux end message
    if (mpiHelper.rank() == 0)
    {
        Parameters::print();
        DumuxMessage::print(/*firstCall=*/false);
    }

    return 0;
} // end main
catch (Dumux::ParameterException &e)
{
    std::cerr << std::endl << e << " ---> Abort!" << std::endl;
    return 1;
}
catch (Dune::DGFException & e)
{
    std::cerr << "DGF exception thrown (" << e <<
                 "). Most likely, the DGF file name is wrong "
                 "or the DGF file is corrupted, "
                 "e.g. missing hash at end of file or wrong number (dimensions) of entries."
                 << " ---> Abort!" << std::endl;
    return 2;
}
catch (Dune::Exception &e)
{
    std::cerr << "Dune reported error: " << e << " ---> Abort!" << std::endl;
    return 3;
}
catch (...)
{
    std::cerr << "Unknown exception thrown! ---> Abort!" << std::endl;
    return 4;
}