equation_of_state_pressureless.h

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//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright (C) 2024 - 2026 by the ryujin authors
//
 
#pragma once
 
#include <ryujin/base/compile_time_options.h>
#include <ryujin/euler_aeos/equation_of_state.h>
 
namespace ryujin
{
  namespace EquationsOfState
  {
    class Pressureless : public EquationOfState
    {
    public:
      using EquationOfState::pressure;
      using EquationOfState::specific_internal_energy;
      using EquationOfState::speed_of_sound;
      using EquationOfState::temperature;
 
      Pressureless(const std::string &subsection)
          : EquationOfState("pressureless", subsection)
      {
        gamma_ = 7. / 5.;
        this->add_parameter("gamma", gamma_, "The ratio of specific heats");
      }
 
      double pressure(double rho [[maybe_unused]],
                      double e [[maybe_unused]]) const final
      {
        return 0.0;
      }
 
      double specific_internal_energy(double rho [[maybe_unused]],
                                      double p [[maybe_unused]]) const final
      {
        return 0.0;
      }
 
      double temperature(double /*rho*/, double e [[maybe_unused]]) const final
      {
        return 0.0;
      }
 
      double cold_curve_bound(double /*rho*/) const final
      {
        return 0.0;
      }
 
      double specific_entropy(double /*rho*/, double /*e*/) const final
      {
        return 0.0;
      }
 
      double speed_of_sound(double /*rho*/,
                            double e [[maybe_unused]]) const final
      {
        return 0.0;
      }
 
    private:
      double gamma_;
    };
  } // namespace EquationsOfState
} // namespace ryujin