initial_values.h

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//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright (C) 2020 - 2026 by the ryujin authors
//
 
#pragma once
 
#include <ryujin/base/compile_time_options.h>
#include <ryujin/base/mpi_ensemble.h>
#include <ryujin/base/observer_pointer.h>
#include <ryujin/interface/initial_values.h>
#include <ryujin/interface/offline_data.h>
#include <ryujin/interface/parabolic_system.h>
#include <ryujin/typed/initial_state.h>
 
#include <deal.II/base/parameter_acceptor.h>
#include <deal.II/base/tensor.h>
 
#include <functional>
#include <memory>
#include <vector>
 
namespace ryujin
{
  template <typename HyperbolicDescription, int dim, typename Number = double>
  class InitialValues final : public Interface::InitialValues<dim, Number>
  {
  public:
 
    using HyperbolicSystem = typename HyperbolicDescription::HyperbolicSystem;
 
    using View = typename HyperbolicSystem::template View<dim, Number>;
 
    static constexpr auto problem_dimension = View::problem_dimension;
 
    using state_type = typename View::state_type;
 
    static constexpr auto n_initial_precomputed_values =
        View::n_initial_precomputed_values;
 
    using initial_precomputed_type = typename View::initial_precomputed_type;
 
 
 
    InitialValues(const MPIEnsemble &mpi_ensemble,
                  const Interface::OfflineData<dim, Number> &offline_data,
                  const HyperbolicSystem &hyperbolic_system,
                  const Interface::ParabolicSystem &parabolic_system,
                  const std::string &subsection = "/InitialValues");
 
    void parse_parameters_callback();
 
 
 
    DEAL_II_ALWAYS_INLINE inline state_type
    initial_state(const dealii::Point<dim> &point, Number t) const
    {
      return initial_state_(point, t);
    }
 
    DEAL_II_ALWAYS_INLINE inline initial_precomputed_type
    initial_precomputed(const dealii::Point<dim> &point) const
    {
      return initial_precomputed_(point);
    }
 
    MultiComponentVector<Number>
    interpolate_hyperbolic_vector(Number t = 0) const override;
 
    MultiComponentVector<Number> interpolate_initial_precomputed_vector() const;
 
  private:
 
 
    std::string configuration_;
 
    dealii::Point<dim> initial_position_;
 
    dealii::Tensor<1, dim> initial_direction_;
 
    Number perturbation_;
 
 
 
    const MPIEnsemble &mpi_ensemble_;
 
    dealii::ObserverPointer<const Interface::OfflineData<dim, Number>>
        offline_data_;
    dealii::ObserverPointer<const HyperbolicSystem> hyperbolic_system_;
    dealii::ObserverPointer<const Interface::ParabolicSystem> parabolic_system_;
 
    std::vector<
        std::unique_ptr<InitialState<HyperbolicDescription, dim, Number>>>
        initial_state_list_;
 
    std::function<state_type(const dealii::Point<dim> &, Number)>
        initial_state_;
 
    std::function<initial_precomputed_type(const dealii::Point<dim> &)>
        initial_precomputed_;
 
  };
 
} // namespace ryujin