RelPermLiakopoulos.cpp

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#include "RelPermLiakopoulos.h"
 
#include <algorithm>
#include <cmath>
 
#include "MaterialLib/MPL/Medium.h"
 
namespace MaterialPropertyLib
{
RelPermLiakopoulos::RelPermLiakopoulos(std::string name)
{
    name_ = std::move(name);
}
 
PropertyDataType RelPermLiakopoulos::value(
    VariableArray const& variable_array,
    ParameterLib::SpatialPosition const& pos, double const t,
    double const dt) const
{
    auto const s_L = std::visit(
        [&variable_array, &pos, t, dt](auto&& scale) -> double
        {
            return scale->property(PropertyType::saturation)
                .template value<double>(variable_array, pos, t, dt);
        },
        scale_);
    auto const s_L_res = residual_liquid_saturation_;
 
    if (s_L <= s_L_res)
    {
        return 0.0;
    }
 
    if (s_L >= 1.)
    {
        return 1.0;
    }
 
    auto const a = parameter_a_;
    auto const b = parameter_b_;
 
    auto const k_rel_LR = 1. - a * std::pow(1. - s_L, b);
 
    return std::max(k_rel_LR, 0.);
}
 
PropertyDataType RelPermLiakopoulos::dValue(
    VariableArray const& variable_array, Variable const variable,
    ParameterLib::SpatialPosition const& pos, double const t,
    double const dt) const
{
    if (variable != Variable::liquid_saturation)
    {
        OGS_FATAL(
            "RelPermLiakopoulos::dValue is implemented for derivatives with "
            "respect to liquid saturation only.");
    }
    auto const s_L = std::visit(
        [&variable_array, &pos, t, dt](auto&& scale) -> double
        {
            return scale->property(PropertyType::saturation)
                .template value<double>(variable_array, pos, t, dt);
        },
        scale_);
    auto const s_L_res = residual_liquid_saturation_;
    auto const s_L_max = maximal_liquid_saturation_;
 
    const double s_L_within_range = std::min(std::max(s_L_res, s_L), s_L_max);
 
    auto const a = parameter_a_;
    auto const b = parameter_b_;
 
    return a * b * std::pow(1. - s_L_within_range, b - 1.);
}
 
}  // namespace MaterialPropertyLib