Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F85294968
bem_fft_base.cpp
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Sat, Sep 28, 02:28
Size
8 KB
Mime Type
text/x-c
Expires
Mon, Sep 30, 02:28 (1 d, 22 h)
Engine
blob
Format
Raw Data
Handle
21145651
Attached To
rTAMAAS tamaas
bem_fft_base.cpp
View Options
/**
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas 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.
*
* Tamaas 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 Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "bem_fft_base.hh"
/* -------------------------------------------------------------------------- */
#define TIMER
#include "surface_timer.hh"
#include "surface_statistics.hh"
#include "meta_functional.hh"
#include "elastic_energy_functional.hh"
#include "fft_plan_manager.hh"
/* -------------------------------------------------------------------------- */
#include <omp.h>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
/* -------------------------------------------------------------------------- */
BemFFTBase::BemFFTBase(Surface<Real> & p):
BemInterface(p),
functional(new MetaFunctional(*this)),
surface_tractions(p.size(),p.getL()),
surface_displacements(p.size(),p.getL()),
surface_spectral_input(p.size(),p.getL()),
surface_spectral_output(p.size(),p.getL()),
surface_spectral_influence_disp(p.size(),p.getL()),
true_displacements(p.size(),p.getL()),
old_displacements(p.size(),p.getL()),
gap(p.size(),p.getL()),
e_star(std::nan("")),
tmp_coeff(1./M_PI){
// this->setNumberOfThreads(this->nthreads);
max_iterations = 5000;
dump_freq = 100;
this->functional->addFunctionalTerm(new ElasticEnergyFunctional(*this));
std::cerr << this << " is setting up the surfaces";
std::cerr << &p << " has size " << p.size() << std::endl;
}
/* -------------------------------------------------------------------------- */
BemFFTBase::~BemFFTBase() {
FFTPlanManager::get().clean();
}
/* -------------------------------------------------------------------------- */
const Surface<Real> & BemFFTBase::getTractions() const{
return surface_tractions;
}
/* -------------------------------------------------------------------------- */
const Surface<Real> & BemFFTBase::getDisplacements()const{
return surface_displacements;
}
/* -------------------------------------------------------------------------- */
const Surface<Real> & BemFFTBase::getSpectralInfluenceOverDisplacement(){
return surface_spectral_influence_disp;
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::setEffectiveModulus(Real e_star){
this->e_star = e_star;
this->computeSpectralInfluenceOverDisplacement();
}
/* -------------------------------------------------------------------------- */
Real BemFFTBase::getEffectiveModulus(){
return this->e_star;
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::computeSpectralInfluenceOverDisplacement(){
STARTTIMER("computeSpectralInfluenceOverDisplacement");
if (std::isnan(tmp_coeff)) SURFACE_FATAL("constant tmp_coeff is nan");
if (std::isnan(e_star)) SURFACE_FATAL("constant e_star is nan");
UInt n = surface.size();
surface_spectral_influence_disp(0) = 0.;
// everything but the external lines and central lines
#pragma omp parallel for
for (UInt i = 1; i < n/2; ++i) {
for (UInt j = 1; j < n/2; ++j) {
Real d = sqrt(i*i+j*j);
surface_spectral_influence_disp(i,j) = 1./d;
surface_spectral_influence_disp(n-i,j) = 1./d;
surface_spectral_influence_disp(i,n-j) = 1./d;
surface_spectral_influence_disp(n-i,n-j) = 1./d;
}
}
// external line (i or j == 0)
#pragma omp parallel for
for (UInt i = 1; i < n/2; ++i) {
Real d = i;
surface_spectral_influence_disp(i,0) = 1./d;
surface_spectral_influence_disp(n-i,0) = 1./d;
surface_spectral_influence_disp(0,i) = 1./d;
surface_spectral_influence_disp(0,n-i) = 1./d;
}
//internal line (i or j == n/2)
#pragma omp parallel for
for (UInt i = 1; i < n/2; ++i) {
Real d = sqrt(i*i+n/2*n/2);
surface_spectral_influence_disp(i,n/2) = 1./d;
surface_spectral_influence_disp(n-i,n/2) = 1./d;
surface_spectral_influence_disp(n/2,i) = 1./d;
surface_spectral_influence_disp(n/2,n-i) = 1./d;
}
{
//i == n/2 j == n/2
Real d = sqrt(2*n/2*n/2);
surface_spectral_influence_disp(n/2,n/2) = 1./d;
//i == 0 j == n/2
d = n/2;
surface_spectral_influence_disp(0,n/2) = 1./d;
//i == n/2 j == 0
surface_spectral_influence_disp(n/2,0) = 1./d;
}
UInt size = n*n;
Real L = surface.getL();
#pragma omp parallel for
for (UInt i = 0; i < size; ++i) {
surface_spectral_influence_disp(i) *= tmp_coeff/this->e_star*L;
}
STOPTIMER("computeSpectralInfluenceOverDisplacement");
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::computeDisplacementsFromTractions(){
STARTTIMER("computeDisplacementsFromTractions");
this->applyInfluenceFunctions(surface_tractions,surface_displacements);
STOPTIMER("computeDisplacementFromTractions");
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::computeTractionsFromDisplacements(){
STARTTIMER("computeDisplacementsFromTractions");
this->applyInverseInfluenceFunctions(surface_displacements,surface_tractions);
STOPTIMER("computeDisplacementFromTractions");
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::applyInfluenceFunctions(Surface<Real> & input, Surface<Real> & output){
STARTTIMER("applyInfluenceFunctions");
FFTransform<Real, 2> & plan1 = FFTPlanManager::get().createPlan(input,surface_spectral_output);
plan1.forwardTransform();
surface_spectral_output *= surface_spectral_influence_disp;
FFTransform<Real, 2> & plan2 = FFTPlanManager::get().createPlan(output,surface_spectral_output);
plan2.backwardTransform();
STOPTIMER("applyInfluenceFunctions");
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::applyInverseInfluenceFunctions(Surface<Real> & input, Surface<Real> & output){
STARTTIMER("applyInfluenceFunctions");
FFTransform<Real, 2> & plan1 = FFTPlanManager::get().createPlan(input,surface_spectral_output);
plan1.forwardTransform();
surface_spectral_output /= surface_spectral_influence_disp;
surface_spectral_output(0) = 0;
FFTransform<Real, 2> & plan2 = FFTPlanManager::get().createPlan(output,surface_spectral_output);
plan2.backwardTransform();
STOPTIMER("applyInfluenceFunctions");
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::computeGaps() {
UInt size = surface.size();
#pragma omp parallel for
for (UInt i = 0 ; i < size*size ; i++) {
gap(i) = true_displacements(i) - surface(i);
}
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::computeTrueDisplacements(){
this->true_displacements = this->surface_displacements;
UInt n = surface.size();
UInt size = n*n;
Real shift = 1e300;
for (UInt i = 0; i < size; ++i) {
if (surface_displacements(i) - shift - surface(i) < 0.){
shift = surface_displacements(i) - surface(i);
}
}
for (UInt i = 0; i < size; ++i) {
true_displacements(i) = surface_displacements(i) - shift;
}
}
/* -------------------------------------------------------------------------- */
void BemFFTBase::addFunctional(Functional *new_funct) {
this->functional->addFunctionalTerm(new_funct);
}
/* -------------------------------------------------------------------------- */
__END_TAMAAS__
Event Timeline
Log In to Comment