SteadyStateDiffusion.h

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#pragma once
 
#include "NumLib/DOF/LocalToGlobalIndexMap.h"
#include "ProcessLib/Process.h"
#include "ProcessLib/SurfaceFlux/SurfaceFluxData.h"
#include "SteadyStateDiffusionData.h"
#include "SteadyStateDiffusionFEM.h"
 
namespace ProcessLib
{
namespace SteadyStateDiffusion
{
class SteadyStateDiffusion final : public Process
{
public:
    SteadyStateDiffusion(
        std::string name,
        MeshLib::Mesh& mesh,
        std::unique_ptr<ProcessLib::AbstractJacobianAssembler>&&
            jacobian_assembler,
        std::vector<std::unique_ptr<ParameterLib::ParameterBase>> const&
            parameters,
        unsigned const integration_order,
        std::vector<std::vector<std::reference_wrapper<ProcessVariable>>>&&
            process_variables,
        SteadyStateDiffusionData&& process_data,
        SecondaryVariableCollection&& secondary_variables,
        std::unique_ptr<ProcessLib::SurfaceFluxData>&& surfaceflux);
 
 
    bool isLinear() const override { return true; }
 
    Eigen::Vector3d getFlux(std::size_t element_id,
                            MathLib::Point3d const& p,
                            double const t,
                            std::vector<GlobalVector*> const& x) const override
    {
        // fetch local_x from primary variable
        std::vector<GlobalIndexType> indices_cache;
        auto const r_c_indices = NumLib::getRowColumnIndices(
            element_id, *_local_to_global_index_map, indices_cache);
        constexpr int process_id = 0;  // monolithic scheme.
        std::vector<double> local_x(x[process_id]->get(r_c_indices.rows));
 
        return _local_assemblers[element_id]->getFlux(p, t, local_x);
    }
 
    void postTimestepConcreteProcess(
        std::vector<GlobalVector*> const& x,
        std::vector<GlobalVector*> const& /*x_prev*/,
        const double t,
        const double /*delta_t*/,
        int const process_id) override
    {
        // For this single process, process_id is always zero.
        if (process_id != 0)
        {
            OGS_FATAL(
                "The condition of process_id = 0 must be satisfied for "
                "SteadyStateDiffusion, which is a single process.");
        }
        if (!_surfaceflux)  // computing the surfaceflux is optional
        {
            return;
        }
 
        ProcessLib::ProcessVariable const& pv =
            getProcessVariables(process_id)[0];
 
        _surfaceflux->integrate(x, t, *this, process_id, _integration_order,
                                _mesh, pv.getActiveElementIDs());
    }
 
private:
    void initializeConcreteProcess(
        NumLib::LocalToGlobalIndexMap const& dof_table,
        MeshLib::Mesh const& mesh,
        unsigned const integration_order) override;
 
    void assembleConcreteProcess(const double t, double const dt,
                                 std::vector<GlobalVector*> const& x,
                                 std::vector<GlobalVector*> const& x_prev,
                                 int const process_id, GlobalMatrix& M,
                                 GlobalMatrix& K, GlobalVector& b) override;
 
    void assembleWithJacobianConcreteProcess(
        const double t, double const dt, std::vector<GlobalVector*> const& x,
        std::vector<GlobalVector*> const& x_prev, int const process_id,
        GlobalMatrix& M, GlobalMatrix& K, GlobalVector& b,
        GlobalMatrix& Jac) override;
 
    SteadyStateDiffusionData _process_data;
 
    std::vector<std::unique_ptr<SteadyStateDiffusionLocalAssemblerInterface>>
        _local_assemblers;
 
    std::unique_ptr<ProcessLib::SurfaceFluxData> _surfaceflux;
};
 
}  // namespace SteadyStateDiffusion
}  // namespace ProcessLib