CoarseningManager2d.cc

#include "CoarseningManager2d.h"
#include "Mesh.h"
#include "AdaptStationary.h"
#include "AdaptInstationary.h"
#include "Traverse.h"
#include "MacroElement.h"
#include "RCNeighbourList.h"
#include "FixVec.h"
#include "DOFIndexed.h"

namespace AMDiS {

  /****************************************************************************/
  /*  coarseTriangle:  coarses a single element of the coarsening patch; dofs */
  /*  in the interior of the element are removed; dofs for higher order       */
  /*  at the boundary or the coarsening patch still belong to                 */
  /*  the parent. Do not remove them form the mesh!!!                         */
  /****************************************************************************/

  void CoarseningManager2d::coarsenTriangle(Triangle *el)
  {
    FUNCNAME("CoarseningManager2d::coarseTriangle()");

    Triangle *child[2];
    child[0] = dynamic_cast<Triangle*>(const_cast<Element*>(el->getChild(0)));
    child[1] = dynamic_cast<Triangle*>(const_cast<Element*>(el->getChild(1))); 

    TEST_EXIT_DBG(child[0]->getMark() < 0  &&  child[1]->getMark() < 0)
      ("element %d with children[%d,%d] must not be coarsend!\n",
       el->getIndex(), child[0]->getIndex(), child[1]->getIndex());
  
    if (mesh->getNumberOfDOFs(EDGE)) {
      /****************************************************************************/
      /*  remove dof from common edge of child[0] and child[1]                    */
      /****************************************************************************/
      mesh->freeDOF(const_cast<int*>(child[0]->getDOF(4)), EDGE);
    }

    if (mesh->getNumberOfDOFs(CENTER)) {
      /****************************************************************************/
      /*  remove dof from the barycenters of child[0] and child[1]                */
      /****************************************************************************/
      int  node = mesh->getNode(CENTER);
      
      mesh->freeDOF(const_cast<int*>(child[0]->getDOF(node)), CENTER);
      mesh->freeDOF(const_cast<int*>(child[1]->getDOF(node)), CENTER);
    }
    
    el->coarsenElementData(child[0], child[1]);

    el->setFirstChild(NULL);
    el->setSecondChild(NULL);

    mesh->freeElement(child[0]);
    mesh->freeElement(child[1]);

    el->incrementMark();

    mesh->incrementNumberOfLeaves(-1);
    mesh->incrementNumberOfElements(-2);
    mesh->incrementNumberOfEdges(-1);

    return;
  }

  /****************************************************************************/
  /*  coarsenPatch: first rebuild the dofs on the parents then do restriction */
  /*  of data (if possible) and finally coarsen the patch elements            */
  /****************************************************************************/

  void CoarseningManager2d::coarsenPatch(RCNeighbourList *coarsenList, 
					 int n_neigh, 
					 int bound)
  {
    Triangle *el = dynamic_cast<Triangle*>(const_cast<Element*>( coarsenList->getElement(0)));
    Triangle *neigh = dynamic_cast<Triangle*>(const_cast<Element*>( coarsenList->getElement(1)));
    DegreeOfFreedom *dof[3];

    dof[0] = const_cast<int*>( el->getChild(0)->getDOF(2));
    if (mesh->getNumberOfDOFs(EDGE)) {
      dof[1] = const_cast<int*>( el->getChild(0)->getDOF(3));
      dof[2] = const_cast<int*>( el->getChild(1)->getDOF(4));
    }

    int node = mesh->getNode(EDGE);
    if (mesh->getNumberOfDOFs(EDGE)) {
      /****************************************************************************/
      /*  get new dof on el at the midpoint of the coarsening edge                */
      /****************************************************************************/
      if (!el->getDOF(node+2)) {
	el->setDOF(node+2, mesh->getDOF(EDGE));
	if (neigh) {
	  neigh->setDOF(node+2, const_cast<int*>( el->getDOF(node+2)));
	}
      }
    }

    if (mesh->getNumberOfDOFs(EDGE)  ||  mesh->getNumberOfDOFs(CENTER)) {
      coarsenList->addDOFParents(n_neigh);
    }

    /****************************************************************************/
    /*  restrict dof vectors to the parents on the patch                        */
    /****************************************************************************/
    int nrAdmin = mesh->getNumberOfDOFAdmin();
    for (int iadmin = 0; iadmin < nrAdmin; iadmin++) {
      std::list<DOFIndexedBase*>::iterator it;
      DOFAdmin* admin = const_cast<DOFAdmin*>(&mesh->getDOFAdmin(iadmin));
      std::list<DOFIndexedBase*>::iterator end = admin->endDOFIndexed();    
      for (it = admin->beginDOFIndexed(); it != end; ++it) {
	(*it)->coarseRestrict(*coarsenList, n_neigh);
      }
    }

    coarsenTriangle(el);

    if (neigh) 
      coarsenTriangle(neigh);

    /****************************************************************************/
    /*  now, remove those dofs in the coarcening edge                           */
    /****************************************************************************/
    mesh->freeDOF(dof[0], VERTEX);
    if (mesh->getNumberOfDOFs(EDGE)) {
      mesh->freeDOF(dof[1], EDGE);
      mesh->freeDOF(dof[2], EDGE);
    }

    mesh->incrementNumberOfVertices(-1);
    mesh->incrementNumberOfEdges(-1);

    return;
  }

  int CoarseningManager2d::coarsenFunction(ElInfo *el_info)
  {
    Triangle *el = dynamic_cast<Triangle*>(const_cast<Element*>( el_info->getElement()));
    DegreeOfFreedom *edge[2];
    int n_neigh, bound = 0;
    RCNeighbourList coarse_list(2);

    coarse_list.setCoarseningManager(this);

    if (el->getMark() >= 0)
      return 0; // el must not be coarsend, return
    if (!(el->getChild(0))) 
      return 0;  // single leaves don't get coarsened

    if (el->getChild(0)->getMark() >= 0  || el->getChild(1)->getMark() >= 0) {
      /****************************************************************************/
      /*  one of the children must not be coarsend; return :-(                    */
      /****************************************************************************/
      el->setMark(0);
      return 0;
    }

    if (!el->getChild(0)->isLeaf() || !el->getChild(1)->isLeaf()) {
      /****************************************************************************/
      /*  one of the children is not a leaf element; try again later on           */
      /****************************************************************************/
      doMore = true;
      return 0;
    }

    /****************************************************************************/
    /*  give the refinement edge the right orientation                          */
    /****************************************************************************/

    if (el->getDOF(0,0) < el->getDOF(1,0)) {
      edge[0] = const_cast<int*>( el->getDOF(0));
      edge[1] = const_cast<int*>( el->getDOF(1));
    } else {
      edge[1] = const_cast<int*>( el->getDOF(0));
      edge[0] = const_cast<int*>( el->getDOF(1));
    }

    coarse_list.setElement(0, el, true);

    n_neigh = 1;
    if (coarse_list.setElement(1, el_info->getNeighbour(2))) {
      n_neigh = 2;
      coarse_list.setCoarsePatch(1, el_info->getOppVertex(2) == 2);
    }
  
    /****************************************************************************/
    /*  check wether we can coarsen the patch or not                            */
    /****************************************************************************/

    // ==========================================================================
    // === check for periodic boundary ==========================================
    // ==========================================================================

    if (coarse_list.doCoarsePatch(n_neigh)) {
      int n_neigh_periodic;
      DegreeOfFreedom *next_edge[2];
      RCNeighbourList *periodicList;

      while (edge[0] != NULL) {
	periodicList = coarse_list.periodicSplit(edge, 
						 next_edge,
						 &n_neigh,
						 &n_neigh_periodic);

	TEST_EXIT_DBG(periodicList)("periodicList = NULL\n");

	coarsenPatch(periodicList, n_neigh_periodic, bound);

	edge[0] = next_edge[0];
	edge[1] = next_edge[1];
      }
    }

    return 0;
  }

}