WaterEnthalpyIAPWSIF97Region1.cpp

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#include "WaterEnthalpyIAPWSIF97Region1.h"
 
#include <cmath>
 
#include "BaseLib/Error.h"
#include "MaterialLib/Fluid/GibbsFreeEnergy/DimensionLessGibbsFreeEnergyRegion1.h"
#include "MaterialLib/PhysicalConstant.h"
 
namespace MaterialPropertyLib
{
 
const MaterialLib::Fluid::DimensionLessGibbsFreeEnergyRegion1
    gibbs_free_energy_;
 
static constexpr double ref_T_ = 1386;     
static constexpr double ref_p_ = 1.653e7;  
 
PropertyDataType WaterEnthalpyIAPWSIF97Region1::value(
    VariableArray const& variable_array,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    double const p = std::max(0.0, variable_array.liquid_phase_pressure);
    double const T = variable_array.temperature;
 
    double const tau = ref_T_ / T;
    double const pi = p / ref_p_;
 
    return tau *
           MaterialLib::PhysicalConstant::SpecificGasConstant::WaterVapour * T *
           gibbs_free_energy_.get_dgamma_dtau(tau, pi);
}
 
PropertyDataType WaterEnthalpyIAPWSIF97Region1::dValue(
    VariableArray const& variable_array, Variable const variable,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    double const p = std::max(0.0, variable_array.liquid_phase_pressure);
    double const T = variable_array.temperature;
 
    double const tau = ref_T_ / T;
    double const pi = p / ref_p_;
 
    if (variable == Variable::temperature)
    {
        return -tau * tau * gibbs_free_energy_.get_dgamma_dtau_dtau(tau, pi) *
               MaterialLib::PhysicalConstant::SpecificGasConstant::WaterVapour;
    }
 
    OGS_FATAL(
        "WaterEnthalpyIAPWSIF97Region1::dValue is implemented for derivatives "
        "with respect to temperature only.");
}
}  // namespace MaterialPropertyLib