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fixedpointiterator.cc 7.43 KiB
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <dune/common/exceptions.hh>

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#include <dune/matrix-vector/axpy.hh>

#include <dune/tectonic/utils/reductionfactors.hh>
#include "functionalfactory.hh"
#include "nonlinearsolver.hh"
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#include "../utils/debugutils.hh"

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#include "fixedpointiterator.hh"
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void FixedPointIterationCounter::operator+=(
    FixedPointIterationCounter const &other) {
  iterations += other.iterations;
  multigridIterations += other.multigridIterations;
}

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template <class Factory, class NBodyAssembler, class Updaters, class ErrorNorms>
FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::FixedPointIterator(
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    Dune::ParameterTree const &parset,
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    const NBodyAssembler& nBodyAssembler,
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    const IgnoreVector& ignoreNodes,
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    GlobalFriction& globalFriction,
    const std::vector<const BitVector*>& bodywiseNonmortarBoundaries,
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    const ErrorNorms& errorNorms)
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    : parset_(parset),
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      nBodyAssembler_(nBodyAssembler),
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      ignoreNodes_(ignoreNodes),
      globalFriction_(globalFriction),
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      bodywiseNonmortarBoundaries_(bodywiseNonmortarBoundaries),
      fixedPointMaxIterations_(parset.get<size_t>("v.fpi.maximumIterations")),
      fixedPointTolerance_(parset.get<double>("v.fpi.tolerance")),
      lambda_(parset.get<double>("v.fpi.lambda")),
      solverParset_(parset.sub("v.solver")),
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      errorNorms_(errorNorms) {}
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template <class Factory, class NBodyAssembler, class Updaters, class ErrorNorms>
template <class LinearSolver>
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FixedPointIterationCounter
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FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::run(
    Updaters updaters, std::shared_ptr<LinearSolver>& linearSolver,
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    const std::vector<Matrix>& velocityMatrices, const std::vector<Vector>& velocityRHSs,
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    std::vector<Vector>& velocityIterates) {

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  //std::cout << "FixedPointIterator::run()" << std::endl;
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  const auto nBodies = nBodyAssembler_.nGrids();

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  // debugging
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  /*const auto& contactCouplings = nBodyAssembler_.getContactCouplings();
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  for (size_t i=0; i<contactCouplings.size(); i++) {
    print(*contactCouplings[i]->nonmortarBoundary().getVertices(), "nonmortarBoundaries:");
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  }*/
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  FunctionalFactory<std::decay_t<decltype(nBodyAssembler_)>, decltype(globalFriction_), Matrix, Vector> functionalFactory(nBodyAssembler_, globalFriction_, velocityMatrices, velocityRHSs);
  functionalFactory.build();
  auto functional = functionalFactory.functional();
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  NonlinearSolver<std::remove_reference_t<decltype(*functional)>, IgnoreVector> solver(parset_.sub("solver.tnnmg"), linearSolver, functional, ignoreNodes_);
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  size_t fixedPointIteration;
  size_t multigridIterations = 0;
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  std::vector<ScalarVector> alpha(nBodies);
  updaters.state_->extractAlpha(alpha);
  Vector totalVelocityIterate, old_v;
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  nBodyAssembler_.nodalToTransformed(velocityIterates, totalVelocityIterate);
  old_v = totalVelocityIterate;
  for (fixedPointIteration = 0; fixedPointIteration < fixedPointMaxIterations_;
       ++fixedPointIteration) {
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    //print(alpha, "alpha:");
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    // contribution from nonlinearity
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    globalFriction_.updateAlpha(alpha);

    auto res = solver.solve(solverParset_, totalVelocityIterate);
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    nBodyAssembler_.postprocess(totalVelocityIterate, velocityIterates);
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    //nBodyAssembler_.postprocess(totalVelocityIterate, velocityIterates);
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    //print(totalVelocityIterate, "totalVelocityIterate:");
    //print(velocityIterates, "velocityIterates:");
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    //DUNE_THROW(Dune::Exception, "Just need to stop here!");
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    multigridIterations += res.iterations;
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    Vector v_m = old_v;
    v_m *= 1.0 - lambda_;
    Dune::MatrixVector::addProduct(v_m, lambda_, totalVelocityIterate);
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    // extract relative velocities in mortar basis
    std::vector<Vector> v_rel;
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    split(v_m, v_rel);
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    //print(v_m, "v_m: ");
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    //print(v_rel, "v_rel");

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    //std::cout << "- State problem set" << std::endl;
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    // solve a state problem
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    updaters.state_->solve(v_rel);
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    //std::cout << "-- Solved" << std::endl;
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    std::vector<ScalarVector> newAlpha(nBodies);
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    updaters.state_->extractAlpha(newAlpha);

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    //print(newAlpha, "new alpha:");

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    bool breakCriterion = true;
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    for (int i=0; i<nBodies; i++) {
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        if (alpha[i].size()==0 || newAlpha[i].size()==0)
            continue;

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        //print(alpha[i], "alpha i:");
        //print(newAlpha[i], "new alpha i:");
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        if (errorNorms_[i]->diff(alpha[i], newAlpha[i]) >= fixedPointTolerance_) {
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            breakCriterion = false;
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            //std::cout << "fixedPoint error: " << errorNorms_[i]->diff(alpha[i], newAlpha[i]) << std::endl;
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            break;
        }
    }
    //std::cout << fixedPointIteration << std::endl;

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    if (lambda_ < 1e-12 or breakCriterion) {
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      //std::cout << "-FixedPointIteration finished! " << (lambda_ < 1e-12 ? "lambda" : "breakCriterion") << std::endl;
      fixedPointIteration++;
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    alpha = newAlpha;
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  //TODO: recently added, might be wrong or superfluous
  globalFriction_.updateAlpha(alpha);

  //print(alpha, "alpha: ");

  //std::cout << "-FixedPointIteration finished with " << fixedPointIteration << " iterations, lambda " << lambda_ <<  "! " << std::endl;
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  if (fixedPointIteration == fixedPointMaxIterations_)
    DUNE_THROW(Dune::Exception, "FPI failed to converge");

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  updaters.rate_->postProcess(velocityIterates);
  // Cannot use return { fixedPointIteration, multigridIterations };
  // with gcc 4.9.2, see also http://stackoverflow.com/a/37777814/179927
  FixedPointIterationCounter ret;
  ret.iterations = fixedPointIteration;
  ret.multigridIterations = multigridIterations;
  return ret;
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/*std::ostream &operator<<(std::ostream &stream,
                         FixedPointIterationCounter const &fpic) {
  return stream << "(" << fpic.iterations << "," << fpic.multigridIterations
                << ")";
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}*/
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template <class Factory, class NBodyAssembler, class Updaters, class ErrorNorms>
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void FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::split(
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    const Vector& v,
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    std::vector<Vector>& splitV) const {
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    const size_t nBodies = nBodyAssembler_.nGrids();
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    size_t globalIdx = 0;
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    splitV.resize(nBodies);
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    for (size_t bodyIdx=0; bodyIdx<nBodies; bodyIdx++) {
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        auto& splitV_ = splitV[bodyIdx];
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        splitV_.resize(nBodyAssembler_.grids_[bodyIdx]->size(dims));
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        for (size_t i=0; i<splitV_.size(); i++) {
            splitV_[i] = v[globalIdx];
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            globalIdx++;
        }
    }

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   /*
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        boundaryNodes =
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        const auto gridView = contactCouplings[couplingIndices[0]]->nonmortarBoundary().gridView();
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        Dune::MultipleCodimMultipleGeomTypeMapper<
            decltype(gridView), Dune::MCMGVertexLayout> const vertexMapper(gridView, Dune::mcmgVertexLayout());
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        for (auto it = gridView.template begin<block_size>(); it != gridView.template end<block_size>(); ++it) {
            const auto i = vertexMapper.index(*it);
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            for (size_t j=0; j<couplingIndices.size(); j++) {
                const auto couplingIdx = couplingIndices[j];
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                if (not contactCouplings[couplingIdx]->nonmortarBoundary().containsVertex(i))
                  continue;
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                localToGlobal_.emplace_back(i);
                restrictions_.emplace_back(weights[bodyIdx][i], weightedNormalStress[bodyIdx][i],
                                          couplings[i]->frictionData()(geoToPoint(it->geometry())));
                break;
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            }

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            globalIdx++;
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        }
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        maxIndex_[bodyIdx] = globalIdx;
    }*/
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}

#include "fixedpointiterator_tmpl.cc"