Exponential.cpp

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#include "MaterialLib/MPL/Properties/Exponential.h"
 
#include <cmath>
 
namespace MaterialPropertyLib
{
Exponential::Exponential(std::string name,
                         double const offset,
                         PropertyDataType const& property_reference_value,
                         ExponentData const& v)
    : exponent_data_(v), offset_(offset)
{
    name_ = std::move(name);
    auto const f = std::get<double>(exponent_data_.factor);
    auto const v0 = std::get<double>(exponent_data_.reference_condition);
    value_ = std::get<double>(property_reference_value) * std::exp(-f * v0);
}
 
PropertyDataType Exponential::value(
    VariableArray const& variable_array,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    auto const f = std::get<double>(exponent_data_.factor);
    auto const v = std::get<double>(variable_array[exponent_data_.type]);
 
    return offset_ + std::get<double>(value_) * std::exp(f * v);
}
 
PropertyDataType Exponential::dValue(
    VariableArray const& variable_array, Variable const variable,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    if (exponent_data_.type != variable)
    {
        return 0.;
    }
 
    auto const f = std::get<double>(exponent_data_.factor);
    auto const v = std::get<double>(variable_array[exponent_data_.type]);
 
    return std::get<double>(value_) * f * std::exp(f * v);
}
 
PropertyDataType Exponential::d2Value(
    VariableArray const& variable_array, Variable const pv1, Variable const pv2,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    if (exponent_data_.type != pv1 && exponent_data_.type != pv2)
    {
        return 0.;
    }
 
    auto const f = std::get<double>(exponent_data_.factor);
    auto const v = std::get<double>(variable_array[exponent_data_.type]);
 
    return std::get<double>(value_) * f * f * std::exp(f * v);
}
 
}  // namespace MaterialPropertyLib