SaturationDependentSwelling.cpp

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#include "MaterialLib/MPL/Properties/SaturationDependentSwelling.h"
 
#include <cmath>
 
#include "MaterialLib/MPL/Medium.h"
#include "MathLib/KelvinVector.h"
#include "ParameterLib/CoordinateSystem.h"
 
namespace MaterialPropertyLib
{
SaturationDependentSwelling::SaturationDependentSwelling(
    std::string name,
    std::array<double, 3>
        swelling_pressures,
    std::array<double, 3>
        exponents,
    double const lower_saturation_limit,
    double const upper_saturation_limit,
    ParameterLib::CoordinateSystem const* const local_coordinate_system)
    : p_(std::move(swelling_pressures)),
      lambda_(std::move(exponents)),
      S_min_(lower_saturation_limit),
      S_max_(upper_saturation_limit),
      local_coordinate_system_(local_coordinate_system)
{
    name_ = std::move(name);
}
 
void SaturationDependentSwelling::checkScale() const
{
    if (!std::holds_alternative<Phase*>(scale_))
    {
        OGS_FATAL(
            "The property 'SaturationDependentSwelling' is implemented on the "
            "'phase' scales only.");
    }
    auto const phase = std::get<Phase*>(scale_);
    if (phase->name != "Solid")
    {
        OGS_FATAL(
            "The property 'SaturationDependentSwelling' must be given in the "
            "'Solid' phase, not in '{:s}' phase.",
            phase->name);
    }
}
 
PropertyDataType SaturationDependentSwelling::value(
    VariableArray const& variable_array,
    VariableArray const& variable_array_prev,
    ParameterLib::SpatialPosition const& pos, double const /*t*/,
    double const dt) const
{
    auto const S_L = variable_array.liquid_saturation;
    auto const S_L_prev = variable_array_prev.liquid_saturation;
 
    Eigen::Matrix<double, 3, 3> const e =
        local_coordinate_system_ == nullptr
            ? Eigen::Matrix<double, 3, 3>::Identity()
            : local_coordinate_system_->transformation_3d(pos);
 
    Eigen::Matrix<double, 3, 3> delta_sigma_sw =
        Eigen::Matrix<double, 3, 3>::Zero();
 
    if (S_L < S_min_)
    {
        return delta_sigma_sw;  // still being zero.
    }
 
    double const S_eff = std::clamp((S_L - S_min_) / (S_max_ - S_min_), 0., 1.);
    double const S_eff_prev =
        std::clamp((S_L_prev - S_min_) / (S_max_ - S_min_), 0., 1.);
 
    double const delta_S_eff = S_eff - S_eff_prev;
 
    if (delta_S_eff == 0.)
    {
        return delta_sigma_sw;  // still being zero.
    }
 
    // \Delta\sigma_{sw} = - \sum_i k_i (\lambda p S_{eff}^{(\lambda_i - 1)}
    // e_i \otimes e_i \Delta S_L / (S_{max} - S_{min}), where
    // e_i \otimes e_i is a square matrix with e_i,0^2 e_i,0*e_i,1 etc.
    for (int i = 0; i < 3; ++i)
    {
        Eigen::Matrix<double, 3, 3> const ei_otimes_ei =
            e.col(i) * e.col(i).transpose();
 
        delta_sigma_sw -=
            lambda_[i] * p_[i] * std::pow(S_eff, lambda_[i] - 1) * ei_otimes_ei;
    }
 
    return (delta_sigma_sw * delta_S_eff / dt).eval();
}
 
PropertyDataType SaturationDependentSwelling::dValue(
    VariableArray const& variable_array,
    VariableArray const& variable_array_prev, Variable const variable,
    ParameterLib::SpatialPosition const& pos, double const /*t*/,
    double const /*dt*/) const
{
    if (variable != Variable::liquid_saturation)
    {
        OGS_FATAL(
            "SaturationDependentSwelling::dValue is implemented for "
            "derivatives with respect to liquid saturation only.");
    }
 
    auto const S_L = variable_array.liquid_saturation;
    auto const S_L_prev = variable_array_prev.liquid_saturation;
 
    Eigen::Matrix<double, 3, 3> const e =
        local_coordinate_system_ == nullptr
            ? Eigen::Matrix<double, 3, 3>::Identity()
            : local_coordinate_system_->transformation_3d(pos);
 
    Eigen::Matrix<double, 3, 3> delta_sigma_sw =
        Eigen::Matrix<double, 3, 3>::Zero();
 
    if (S_L < S_min_)
    {
        return delta_sigma_sw;  // still being zero.
    }
 
    double const S_eff = std::clamp((S_L - S_min_) / (S_max_ - S_min_), 0., 1.);
    double const S_eff_prev =
        std::clamp((S_L_prev - S_min_) / (S_max_ - S_min_), 0., 1.);
 
    double const delta_S_eff = S_eff - S_eff_prev;
 
    // Heaviside(delta S_eff,sw)
    if (std::abs(delta_S_eff) <= 0)
    {
        return delta_sigma_sw;  // still being zero.
    }
 
    for (int i = 0; i < 3; ++i)
    {
        Eigen::Matrix<double, 3, 3> const ei_otimes_ei =
            e.col(i) * e.col(i).transpose();
 
        delta_sigma_sw +=
            lambda_[i] * p_[i] * std::pow(S_eff, lambda_[i] - 1) * ei_otimes_ei;
    }
    return (delta_sigma_sw / (S_max_ - S_min_)).eval();
}
}  // namespace MaterialPropertyLib