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test_material_stiffness_proportional_damping.cc
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test_material_stiffness_proportional_damping.cc
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/**
* @file test_material_stiffness_proportional_damping.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
*
* @date Mon Nov 14 09:15:53 2011
*
* @brief test of the material elastic caughey - physical aspecte
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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 <iostream>
/* -------------------------------------------------------------------------- */
#include <limits>
#include <fstream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "solid_mechanics_model.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#ifdef AKANTU_USE_IOHELPER
# include "io_helper_tools.hh"
#endif //AKANTU_USE_IOHELPER
using namespace akantu;
static bool testFloat(Real a, Real b, Real adm_error);
int main(int argc, char *argv[])
{
akantu::initialize(argc, argv);
akantu::debug::setDebugLevel(akantu::dblWarning);
const ElementType element_type = TYPE;
const UInt dim = ElementClass<TYPE>::getSpatialDimension();
/// load mesh
Mesh mesh(dim);
MeshIOMSH mesh_io;
std::stringstream meshname_sstr;
meshname_sstr << "single_" << element_type << ".msh";
mesh_io.read(meshname_sstr.str().c_str(), mesh);
UInt max_steps = 1000;
Real time_factor = 0.1;
UInt nb_nodes = mesh.getNbNodes();
SolidMechanicsModel model(mesh);
/* ------------------------------------------------------------------------ */
/* Initialization */
/* ------------------------------------------------------------------------ */
model.initArrays();
model.getForce().clear();
model.getVelocity().clear();
model.getAcceleration().clear();
model.getDisplacement().clear();
model.updateResidual();
model.initExplicit();
model.initModel();
model.readMaterials("material_elastic_caughey_damping.dat");
Material & my_mat = model.getMaterial(0);
Real a_value = 1e-6;//3.836e-06;
my_mat.setProperty("alpha", a_value);
model.initMaterials();
std::cout << model.getMaterial(0) << std::endl;
model.assembleMassLumped();
/* ------------------------------------------------------------------------ */
/* Boundary + initial conditions */
/* ------------------------------------------------------------------------ */
Array<UInt> the_nodes(0,1);
Real imposed_disp = 0.1;
for (UInt i = 0; i < nb_nodes; ++i) {
// block lower nodes
if(mesh.getNodes().storage()[i*dim+1] < 0.5) {
for (UInt j=0; j<dim; ++j)
model.getBlockedDOFs().storage()[dim*i + j] = true;
}
// impose displacement
else {
model.getBlockedDOFs().storage()[dim*i + 0] = true;
model.getDisplacement().storage()[dim*i + 1] = imposed_disp;
the_nodes.push_back(i);
}
}
model.updateResidual();
#ifdef AKANTU_USE_IOHELPER
iohelper::DumperParaview dumper;
paraviewInit(dumper, model, element_type, "test_mat_el_cau_dump");
#endif //AKANTU_USE_IOHELPER
/// Setting time step
Real time_step = model.getStableTimeStep() * time_factor;
std::cout << "Time Step = " << time_step << "s" << std::endl;
model.setTimeStep(time_step);
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
for(UInt s = 1; s <= max_steps; ++s) {
if (s%100 == 0)
std::cout << "passing step " << s << "/" << max_steps << std::endl;
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
#ifdef AKANTU_USE_IOHELPER
if(s % 100 == 0) dumper.Dump();
#endif //AKANTU_USE_IOHELPER
}
/*
for (UInt i=0; i<the_nodes.getSize(); ++i) {
std::cout << "disp " << model.getDisplacement().storage()[the_nodes(i)*dim+1] << "; vel " << model.getVelocity().storage()[the_nodes(i)*dim+1] << std::endl;
}
*/
/* ------------------------------------------------------------------------ */
/* Test solution */
/* ------------------------------------------------------------------------ */
Real disp_tol = 1e-07;
Real velo_tol = 1e-03;
// solution triangle_3
Array<Real> disp_triangle_3(0,1); disp_triangle_3.push_back(-0.0344941);
Array<Real> velo_triangle_3(0,1); velo_triangle_3.push_back(-433.9);
// solution quadrangle_4
Array<Real> disp_quadrangle_4(0,1);
disp_quadrangle_4.push_back(0.0338388);
disp_quadrangle_4.push_back(0.0338388);
Array<Real> velo_quadrangle_4(0,1);
velo_quadrangle_4.push_back(-307.221);
velo_quadrangle_4.push_back(-307.221);
// pointer to solution
Array<Real> * disp = NULL;
Array<Real> * velo = NULL;
if (element_type == _triangle_3) {
disp = &disp_triangle_3;
velo = &velo_triangle_3;
}
else if (element_type == _quadrangle_4) {
disp = &disp_quadrangle_4;
velo = &velo_quadrangle_4;
}
for (UInt i=0; i<the_nodes.getSize(); ++i) {
UInt node = the_nodes.storage()[i];
if (!testFloat(model.getDisplacement().storage()[node*dim+1], disp->storage()[i], disp_tol)) {
std::cout << "Node " << node << " has wrong disp. Computed = " << model.getDisplacement().storage()[node*dim+1] << " Solution = " << disp->storage()[i] << std::endl;
return EXIT_FAILURE;
}
if (!testFloat(model.getVelocity().storage()[node*dim+1], velo->storage()[i], velo_tol)) {
std::cout << "Node " << node << " has wrong velo. Computed = " << model.getVelocity().storage()[node*dim+1] << " Solution = " << velo->storage()[i] << std::endl;
return EXIT_FAILURE;
}
}
finalize();
std::cout << "Patch test successful!" << std::endl;
return EXIT_SUCCESS;
}
/* -------------------------------------------------------------------------- */
bool testFloat(Real a, Real b, Real adm_error) {
if (fabs(a-b) < adm_error)
return true;
else
return false;
}

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