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tamaas/src/solvers/maxwell_viscoelastic.hh
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maxwell_viscoelastic.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2024 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides),
* Laboratory (IJLRDA - Institut Jean Le Rond d'Alembert)
* Copyright (©) 2020-2024 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef MAXWELL_VISCOELASTIC_HH
#define MAXWELL_VISCOELASTIC_HH
/* -------------------------------------------------------------------------- */
#include "polonsky_keer_rey.hh"
#include "westergaard.hh"
/* -------------------------------------------------------------------------- */
namespace tamaas {
/**
@brief Viscoelastic, pressure-based normal contact solver, based on
a generalized Maxwell model
*/
class MaxwellViscoelastic : public PolonskyKeerRey {
public:
/// Constructor
MaxwellViscoelastic(Model& model, const GridBase<Real>& surface,
Real tolerance, Real time_step,
std::vector<Real> shear_moduli_maxwell,
std::vector<Real> characteristic_times);
~MaxwellViscoelastic() override = default;
public:
/// \cond DO_NOT_DOCUMENT
using PolonskyKeerRey::solve;
/// \endcond
/// Main solve function with backward euler scheme
Real solve(std::vector<Real> target) override;
/// Reset function, reset the global displacement and the partial displacement
void reset();
private:
/// Compute the effective shear moduli for maxwell branches
Real computeGtilde(const Real& time_step,
const std::vector<Real>& shear_moduli_maxwell,
const std::vector<Real>& characteristic_times) const;
/// Compute the partial displacement coefficient for each maxwell branch to
/// update surface
std::vector<Real>
computeGamma(const Real& time_step,
const std::vector<Real>& shear_moduli_maxwell,
const std::vector<Real>& characteristic_times) const;
protected:
Real time_step_;
std::vector<Real> shear_moduli_; ///< list of shear moduli
std::vector<Real>
characteristic_times_; ///< list of characteristic relaxation times
std::vector<GridBase<Real>> M; ///< partial displacements
GridBase<Real> U; ///< global viscoelastic displacement
};
} // namespace tamaas
#endif // MAXWELL_VISCOELASTIC_HH
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