boundarypatchfactory.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set ts=4 sw=2 et sts=2:
 
// SPDX-FileCopyrightText: Copyright © DUNE-FUFEM Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
 
#ifndef DUNE_FUFEM_UTILITIES_BOUNDARYPATCH_FACTORY_HH
#define DUNE_FUFEM_UTILITIES_BOUNDARYPATCH_FACTORY_HH
 
#include <dune/common/fvector.hh>
#include <dune/common/parametertree.hh>
 
#include <dune/fufem/boundarypatch.hh>
 
template <class GridView>
struct CombinedFaceInsertion {
 
  using It = typename GridView::Intersection;
 
  CombinedFaceInsertion() = default;
 
  bool operator() (const It& it) const {
 
    for (size_t i=0; i<criteria_.size(); i++)
      if (!criteria_[i](it))
        return false;
 
    return true;
  }
 
  void add(std::function<bool(const It&)> insertion) {
    criteria_.push_back(insertion);
  }
 
private:
  std::vector<std::function<bool(const It&)> > criteria_;
};
 
template <class GridView>
class BoundaryPatchFactory
{
public:
 
  static bool setupBoundaryPatch(const Dune::ParameterTree& config, BoundaryPatch<GridView>& patch) {
 
    if (!config.hasKey("nCriterions"))
        return false;
 
    // setup patch from given criterions
    int nCriterions = config.get<int>("nCriterions");
    CombinedFaceInsertion<GridView> faceInsertion;
 
    using It = typename GridView::Intersection;
    Dune::FieldVector<typename GridView::ctype,GridView::dimension-1> zero(0);
 
    // return whether any criterion was found
    bool found(false);
 
    // parse each insertion criterion
    for (int i=0; i<nCriterions; i++) {
 
      const auto& sub = config.sub("criterion" + std::to_string(i));
 
      // so far each criterion has a component and a bound
      int comp   = sub.get<int>("component");
      auto bound = sub.get<typename GridView::ctype>("bound");
      auto type  = sub.get<std::string>("type");
 
      if (type=="LowerCentre")
        faceInsertion.add([=] (const It& it) {return it.geometry().center()[comp]<=bound;});
      else if (type=="UpperCentre")
        faceInsertion.add([=] (const It& it) {return it.geometry().center()[comp]>=bound;});
      else if (type=="LowerNormal")
        faceInsertion.add([=] (const It& it)
        {return (!it.neighbor() && (it.unitOuterNormal(zero)[comp]<=bound));});
      else if (type=="UpperNormal")
        faceInsertion.add([=] (const It& it)
        {return (!it.neighbor() && (it.unitOuterNormal(zero)[comp]>=bound));});
      else
        DUNE_THROW(Dune::NotImplemented, "There is no insertion criterion "+type);
 
      found = true;
    }
 
    // insert all faces into the boundary patch
    patch.insertFacesByProperty(faceInsertion);
    return found;
  }
};
 
#endif