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ntn_contact_solvercallback.cc
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Sat, Jan 18, 12:03

ntn_contact_solvercallback.cc
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/**
* Copyright (©) 2019-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------- */
#include "ntn_contact_solvercallback.hh"
#include "ntn_initiation_function.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
//NTNContactSolverCallback::NTNContactSolverCallback(
// SolidMechanicsModel & solid, NTNBaseContact & base_contact,
// NTNBaseFriction & friction)
// : InterceptSolverCallback(solid), solid(solid), base_contact(base_contact),
// friction(friction) {}
/* -------------------------------------------------------------------------- */
NTNContactSolverCallback::NTNContactSolverCallback(SolidMechanicsModel & solid, const ID & slave, const ID & master, Int surface_normal_dir, Real time_step_factor): InterceptSolverCallback(solid), solid(solid){
AKANTU_DEBUG_IN();
// Create note to node contact
contact = std::make_shared<NTNContact>(solid);
// Init explicit solid mechanics model
solid.initFull(SolidMechanicsModelOptions(_explicit_lumped_mass));
// Necessary for node to node contact !
solid.assembleMassLumped();
contact->addSurfacePair(slave,master,surface_normal_dir);
base_contact = contact;
base_contact->updateNormals();
base_contact->updateLumpedBoundary();
Real stable_time_step = solid.getStableTimeStep();
Real time_step = stable_time_step * time_step_factor;
solid.setTimeStep(time_step);
base_contact->updateImpedance();
friction = initializeNTNFriction(*contact);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNContactSolverCallback::assembleResidual() {
auto && dof_manager = solid.getDOFManager();
// Assemble the residual of the solid mechanics problem
solid.assembleInternalForces();
auto & internal_force = solid.getInternalForce();
auto & external_force = solid.getExternalForce();
dof_manager.assembleToResidual("displacement", external_force, 1);
dof_manager.assembleToResidual("displacement", internal_force, 1);
// Compute the contact - friction part of the problem and add to the residual
contact->computeContactPressure();
friction->updateSlip();
friction->computeFrictionTraction();
// Assemble the global array for the contact pressure and the friction
// traction
contact->assembleGlobalContactPressure();
friction->assembleGlobalFrictionTraction();
auto & contact_pressure = contact->getGlobalContactPressure();
auto & friction_traction = friction->getGlobalFrictionTraction();
// The two functions contact.applyContactPressure and
// friction.applyFrictionTraction() are replaced by assembling the forces to
// the residual directly
dof_manager.assembleToResidual("displacement", contact_pressure, 1);
dof_manager.assembleToResidual("displacement", friction_traction, 1);
}
} // namespace akantu

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