IsothermalGlen.cc

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/* Copyright (C) 2015, 2016, 2017, 2023 PISM Authors
 *
 * This file is part of PISM.
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 * PISM is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
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 * version.
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
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 * You should have received a copy of the GNU General Public License
 * along with PISM; if not, write to the Free Software
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 */
 
#include <cmath>
 
#include "pism/rheology/IsothermalGlen.hh"
#include "pism/util/ConfigInterface.hh"
 
namespace pism {
namespace rheology {
 
IsothermalGlen::IsothermalGlen(const std::string &prefix,
                               const Config &config, EnthalpyConverter::Ptr ec)
  : PatersonBudd(prefix, config, ec) {
  m_name = "isothermal Glen";
  
  m_softness_A = config.get_number("flow_law.isothermal_Glen.ice_softness");
  m_hardness_B = pow(m_softness_A, m_hardness_power);
}
 
double IsothermalGlen::flow_impl(double stress, double, double, double) const {
  return m_softness_A * pow(stress, m_n-1);
}
 
double IsothermalGlen::softness_impl(double, double) const {
  return m_softness_A;
}
 
double IsothermalGlen::hardness_impl(double, double) const {
  return m_hardness_B;
}
 
double IsothermalGlen::flow_from_temp(double stress, double, double, double) const {
  return m_softness_A * pow(stress,m_n-1);
}
 
} // end of namespace rheology
} // end of namespace pism