equations/perfect_gas/ExactRiemannSolver.hpp

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// Copyright (c) 2020 Maikel Nadolski
//
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// of this software and associated documentation files (the "Software"), to deal
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// furnished to do so, subject to the following conditions:
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#ifndef FUB_EQUATIONS_PERFECT_GAS_EXACT_RIEMANN_SOLVER_HPP
#define FUB_EQUATIONS_PERFECT_GAS_EXACT_RIEMANN_SOLVER_HPP
 
#include "fub/equations/PerfectGas.hpp"
#include "fub/ExactRiemannSolver.hpp"
#include "fub/Duration.hpp"
 
namespace fub {
 
template <int Dim> class ExactRiemannSolver<PerfectGas<Dim>> {
public:
  using Complete = typename PerfectGas<Dim>::Complete;
  using CompleteArray = typename PerfectGas<Dim>::CompleteArray;
 
  explicit ExactRiemannSolver(const PerfectGas<Dim>& equation)
      : equation_{equation} {}
 
  /// Returns either left or right, depending on the upwind velocity.
  void SolveRiemannProblem(
    Complete& state, const Complete& left, const Complete& right, double, double, Duration dt, double dx,
    Direction dir);
 
  void SolveRiemannProblem(Complete& state, const Complete& left,
                           const Complete& right, Direction dir);
 
  void SolveRiemannProblem(CompleteArray& state, const CompleteArray& left,
                           const CompleteArray& right, Direction dir);
 
  void SolveRiemannProblem(CompleteArray& state, const CompleteArray& left,
                           const CompleteArray& right, MaskArray mask,
                           Direction dir);
 
  /// Returns the upwind velocity in the specified direction.
  std::array<double, 2> ComputeSignals(const Complete&, const Complete&,
                                       Direction dir);
 
  std::array<Array1d, 2> ComputeSignals(const CompleteArray&,
                                        const CompleteArray&, Direction dir);
 
  std::array<double, 2> ComputeMiddleState(const Complete& left,
                                           const Complete& right,
                                           Direction dir);
 
private:
  PerfectGas<Dim> equation_;
};
 
extern template class ExactRiemannSolver<PerfectGas<1>>;
extern template class ExactRiemannSolver<PerfectGas<2>>;
extern template class ExactRiemannSolver<PerfectGas<3>>;
 
}
 
#endif