WaterVapourDensityIAPWSIF97Region4.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#include "WaterVapourDensityIAPWSIF97Region4.h"
 
#include <cmath>
 
#include "BaseLib/Error.h"
#include "MaterialLib/MPL/Properties/GibbsFreeEnergy/DimensionlessGibbsFreeEnergyRegion2.h"
#include "MaterialLib/MPL/Properties/WaterSaturationCurveIAPWSIF97Region4.h"
#include "MaterialLib/PhysicalConstant.h"
 
namespace MaterialPropertyLib
{
 
PropertyDataType WaterVapourDensityIAPWSIF97Region4::value(
    VariableArray const& variable_array,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    double const p = variable_array.liquid_phase_pressure;
 
    IAPWSIF97Region4::checkPressureInRange(
        p, "the water vapour saturation density");
 
    double const T_s = IAPWSIF97Region4::waterSaturationTemperature(p);
 
    static constexpr double ref_T_ = 540;   
    static constexpr double ref_p_ = 1.e6;  
    double const tau = ref_T_ / T_s;
    double const pi = p / ref_p_;
 
    double dgamma_dtau =
        MaterialLib::Fluid::DimensionlessGibbsFreeEnergyRegion2::getdGammadPi(
            tau, pi);
 
    return p /
           (pi * MaterialLib::PhysicalConstant::SpecificGasConstant::WaterIF97 *
            T_s * dgamma_dtau);
}
 
PropertyDataType WaterVapourDensityIAPWSIF97Region4::dValue(
    VariableArray const& /*variable_array*/, Variable const /*variable*/,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    OGS_FATAL("WaterVapourDensityIAPWSIF97Region4::dValue is not implemented.");
}
 
}  // namespace MaterialPropertyLib