Marker.h 14.4 KB
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// ============================================================================
// ==                                                                        ==
// == AMDiS - Adaptive multidimensional simulations                          ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  crystal growth group                                                  ==
// ==                                                                        ==
// ==  Stiftung caesar                                                       ==
// ==  Ludwig-Erhard-Allee 2                                                 ==
// ==  53175 Bonn                                                            ==
// ==  germany                                                               ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  http://www.caesar.de/cg/AMDiS                                         ==
// ==                                                                        ==
// ============================================================================

/** \file Marker.h */

#ifndef AMDIS_MARKER_H
#define AMDIS_MARKER_H

#include "MemoryManager.h"
#include "Element.h"
#include "ElInfo.h"
#include "Flag.h"
#include "Mesh.h"
#include "AdaptInfo.h"
#include "Traverse.h"
#include "MatrixVector.h"

namespace AMDiS {

  // ===========================================================================
  // ===== class Marker ========================================================
  // ===========================================================================

  /**
   * \ingroup Adaption
   * 
   * \brief
   * Base class for all scalar markers.
   */
  class Marker
  {
  public:
    /** \brief
     * Constructor.
     */
    Marker() {};

    /** \brief
     * Constructor.
     */
    Marker(::std::string name_, int row_)
      : name(name_), 
	row(row_),
	maximumMarking(false),
	p(2),
	info(10)
    {
      GET_PARAMETER(0, name + "->p", "%f", &p);
      GET_PARAMETER(0, name + "->info", "%d", &info);
    };

    /** \brief
     * destructor
     */
    virtual ~Marker() {};

    /** \brief
     * Marks element with newMark. If \ref maximumMarking is set, the element
     * is marked only if the new mark is bigger than the old one. The return
     * value specifies whether the element has been marked, or not.
     */
    inline void setMark(Element *el, char newMark) {
      char oldMark = el->getMark();

      if (!maximumMarking || (newMark > oldMark)) {
	el->setMark(newMark);
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	if (oldMark > 0) {
	  elMarkRefine--; 
	} else {
	  if (oldMark < 0) 
	    elMarkCoarsen--;
	}

	if (newMark > 0) {
	  elMarkRefine++; 
	} else { 
	  if (newMark < 0) 
	    elMarkCoarsen++;
	}
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      }
    };

    /** \brief
     * Can be used by sub classes. Called before traversal.
     */ 
    virtual void initMarking(AdaptInfo *adaptInfo, Mesh *mesh) {
      elMarkRefine = 0;
      elMarkCoarsen = 0;
      estSum = pow(adaptInfo->getEstSum(row == -1 ? 0 : row), p);
      estMax = adaptInfo->getEstMax(row == -1 ? 0 : row);
    };

    /** \brief
     * Can be used by sub classes. Called after traversal.
     */ 
    virtual void finishMarking(AdaptInfo *adaptInfo) {
      FUNCNAME("Marker::finishMarking()");

      INFO(info, 4)("%d elements marked for refinement\n", elMarkRefine);
      INFO(info, 4)("%d elements marked for coarsening\n", elMarkCoarsen);
    };

    /** \brief
     * Marks one element.
     */
    virtual void markElement(AdaptInfo *adaptInfo, ElInfo *elInfo) {
      Element *el = elInfo->getElement();
      double lError = el->getEstimation(row);

      if (adaptInfo->isRefinementAllowed(row == -1 ? 0 : row) && lError > markRLimit) {
	setMark(el, adaptInfo->getRefineBisections(row == -1 ? 0 : row));
      } else {
	if (adaptInfo->isCoarseningAllowed(row == -1 ? 0 : row) && lError <= markCLimit) {
	  if (!el->getElementData()->getElementData(COARSENABLE) || 
	      (lError + el->getCoarseningEstimation(row)) <= markCLimit) {
	    setMark(el, -adaptInfo->getCoarseBisections(row == -1 ? 0 : row));
	  }
	}
      }
    };
  
    /** \brief
     * Marking of the mesh.
     */
    virtual Flag markMesh(AdaptInfo *adaptInfo, Mesh *mesh) {
      initMarking(adaptInfo, mesh);

      if (!adaptInfo->isCoarseningAllowed(row == -1 ? 0 : row) && 
	  !adaptInfo->isRefinementAllowed(row == -1 ? 0 : row))  {
	return 0;
      }

      TraverseStack stack;
      ElInfo *elInfo = NULL;
      elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL);
      while (elInfo) {
	markElement(adaptInfo, elInfo);
	elInfo = stack.traverseNext(elInfo);
      }

      finishMarking(adaptInfo);

      Flag markFlag;
      if (elMarkRefine) markFlag = 1;
      if (elMarkCoarsen) markFlag |= 2;
      return(markFlag); 
    }; 

    /** \brief
     * Sets \ref maximumMarking.
     */
    inline void setMaximumMarking(bool maxMark) {
      maximumMarking = maxMark;
    };

    inline int getElMarkRefine() { 
      return elMarkRefine; };

    inline int getElMarkCoarsen() { 
      return elMarkCoarsen; 
    };

    /** \brief
     * Creates a scalr marker depending on the strategy set in parameters.
     */
    static Marker *createMarker(::std::string name, int row_);

  protected:
    /** \brief
     * Name of the scalar marker.
     */
    ::std::string name;

    /** \brief
     * Equal to -1 for scalar problems. Component number if marker is
     * part of a vector valued marker.
     */
    int row;

    /** \brief
     * estimation sum
     */
    double estSum;

    /** \brief
     * estmation maximum
     */
    double estMax;

    /** \brief
     * If true, elements are marked only if the new value is bigger than
     * the current marking.
     */
    bool maximumMarking;

    /** \brief
     * Lower limit for error estimation, from which an element is marked for
     * refinement
     */
    double markRLimit;

    /** \brief
     * Upper limit for error estimation, from which an element is marked for 
     * coarsening
     */
    double markCLimit;

    /** \brief
     * power in estimator norm
     */
    double p;

    /** \brief
     * Info level.
     */
    int info;

    /** \brief
     * Counter for elements marked for refinement
     */
    int elMarkRefine;

    /** \brief
     * Counter for elements marked for coarsening
     */
    int elMarkCoarsen;

  };

  // ===========================================================================
  // ===== class GRMarker ======================================================
  // ===========================================================================

  /**
   * \ingroup Adaption
   * 
   * \brief
   * Global refinement.
   */
  class GRMarker : public Marker
  {
  public:
    MEMORY_MANAGED(GRMarker);

    /** \brief
     * Constructor.
     */
    GRMarker(::std::string name_, int row_) 
      : Marker(name_, row_) 
    {};

    /** \brief
     * Implementation of Marker::markElement().
     */
    virtual void markElement(AdaptInfo *adaptInfo, ElInfo *elInfo) {
      Element *el = elInfo->getElement();
      if(adaptInfo->isRefinementAllowed(row == -1 ? 0 : row))
	setMark(el, adaptInfo->getRefineBisections(row == -1 ? 0 : row));
    };
  };

  // ===========================================================================
  // ===== class MSMarker ======================================================
  // ===========================================================================

  /**
   * \ingroup Adaption
   * 
   * \brief
   * Maximum strategy.
   */
  class MSMarker : public Marker
  {
  public:
    MEMORY_MANAGED(MSMarker);

    /** \brief
     * Constructor.
     */
    MSMarker(::std::string name_, int row_) 
      : Marker(name_, row_),
	MSGamma(0.5),
	MSGammaC(0.1)
    {
      GET_PARAMETER(0, name + "->MSGamma", "%f", &MSGamma);
      GET_PARAMETER(0, name + "->MSGammaC", "%f", &MSGammaC);
    };

    /** \brief
     * Implementation of MarkScal::initMarking().
     */
    virtual void initMarking(AdaptInfo *adaptInfo, Mesh *mesh) {
      Marker::initMarking(adaptInfo, mesh);
    
      double MSGammaP = pow(MSGamma, p);
      double MSGammaCP = pow(MSGammaC, p);

      markRLimit = MSGammaP * adaptInfo->getEstMax(row == -1 ? 0 : row);
      markCLimit = MSGammaCP * adaptInfo->getEstMax(row == -1 ? 0 : row);
    };
  
  protected:
    /** \brief
     * Marking parameter.
     */
    double MSGamma;

    /** \brief
     * Marking parameter.
     */
    double MSGammaC;
  };

  // ===========================================================================
  // ===== class ESMarker ======================================================
  // ===========================================================================

  /**
   * \ingroup Adaption
   * 
   * \brief
   * Equidistribution strategy
   */
  class ESMarker : public Marker
  {
  public:
    MEMORY_MANAGED(ESMarker);

    /** \brief
     * Constructor.
     */
    ESMarker(::std::string name_, int row_) 
      : Marker(name_, row_),
	ESTheta(0.9),
	ESThetaC(0.2)
    {
      GET_PARAMETER(0, name + "->ESTheta", "%f", &ESTheta);
      GET_PARAMETER(0, name + "->ESThetaC", "%f", &ESThetaC);
    };

    /** \brief
     * Implementation of MarkScal::initMarking().
     */
    virtual void initMarking(AdaptInfo *adaptInfo, Mesh *mesh) {
      FUNCNAME("ESMarker::initMarking()");

      Marker::initMarking(adaptInfo, mesh);

      double ESThetaP = pow(ESTheta, p);
      double ESThetaCP = pow(ESThetaC, p);

      double epsP = pow(adaptInfo->getSpaceTolerance(row == -1 ? 0 : row), p);

      markRLimit = ESThetaP * epsP / mesh->getNumberOfLeaves();
      markCLimit = ESThetaCP * epsP / mesh->getNumberOfLeaves();

      INFO(info, 2)
	("start mark_limits: %.3le %.3le nt=%d\n",
	 markRLimit, markCLimit, mesh->getNumberOfLeaves());
    };
  
  protected:
    /** \brief
     * Marking parameter.
     */
    double ESTheta;

    /** \brief
     * Marking parameter.
     */
    double ESThetaC;
  };

  // ===========================================================================
  // ===== class GERSMarker ====================================================
  // ===========================================================================

  /**
   * \ingroup Adaption
   * 
   * \brief
   * Guaranteed error reduction strategy 
   */
  class GERSMarker : public Marker
  {
  public:
    MEMORY_MANAGED(GERSMarker);

    /** \brief
     * Constructor.
     */
    GERSMarker(::std::string name_, int row_) 
      : Marker(name_, row_),
	oldErrSum(0.0),
	GERSThetaStar(0.6),
	GERSNu(0.1),
	GERSThetaC(0.1)
    {
      GET_PARAMETER(0, name + "->GERSThetaStar", "%f", &GERSThetaStar);
      GET_PARAMETER(0, name + "->GERSNu", "%f", &GERSNu);
      GET_PARAMETER(0, name + "->GERSThetaC", "%f", &GERSThetaC);
    };

    /** \brief
     * Implementation of Marker::markMesh().
     */
    virtual Flag markMesh(AdaptInfo *adaptInfo, Mesh *mesh) {
      FUNCNAME("GERSMarker::markMesh()");

      initMarking(adaptInfo, mesh);

      if(!adaptInfo->isCoarseningAllowed(row == -1 ? 0 : row) && 
	 !adaptInfo->isRefinementAllowed(row == -1 ? 0 : row)) 
	{
	  return 0;
	}

      GERSSum = 0.0;

      double LTheta = pow(1.0 - GERSThetaStar, p);
      double improv, redfac, wanted, epsP, GERSGamma;

      epsP = pow(adaptInfo->getSpaceTolerance(row == -1 ? 0 : row), p);

      if(estSum < oldErrSum) {
	improv = estSum / oldErrSum;
	wanted = 0.8 * epsP / estSum;
	redfac = ::std::min((1.0 - wanted) / (1.0 - improv), 1.0);
	redfac = ::std::max(redfac, 0.0);

	if(redfac < 1.0) {
	  LTheta *= redfac;
	  INFO(info, 1)
	    ("GERS: use extrapolated theta_star = %lf\n",
	     pow(LTheta, 1.0 / p));
	}
      }

      oldErrSum = estSum;

      GERSGamma = 1.0;

      if(adaptInfo->isRefinementAllowed(row == -1 ? 0 : row)) {
	if(LTheta > 0) {
	  do {
	    GERSSum = 0.0;

	    GERSGamma -= GERSNu;
	    markRLimit = GERSGamma * estMax;

	    TraverseStack stack;
	    ElInfo *elInfo = NULL;
	    elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL);
	    while(elInfo) {
	      markElementForRefinement(adaptInfo, elInfo);
	      elInfo = stack.traverseNext(elInfo);
	    }

	  } while((GERSGamma > 0) && (GERSSum < LTheta * estSum));
	}

	INFO(info, 2)
	  ("GERS refinement with gamma = %.3lf\n", GERSGamma);
      }

      if(adaptInfo->isCoarseningAllowed(row == -1 ? 0 : row)) {
	GERSGamma = 0.3;
	LTheta = GERSThetaC * epsP;

	do {
	  GERSSum = 0.0;
	  GERSGamma -= GERSNu;
	  markCLimit = GERSGamma * estMax;

	  TraverseStack stack;
	  ElInfo *elInfo = NULL;
	  elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL);
	  while(elInfo) {
	    markElementForCoarsening(adaptInfo, elInfo);
	    elInfo = stack.traverseNext(elInfo);
	  }

	  INFO(info, 6)
	    ("coarse loop: gamma=%.3e, sum=%.3e, limit=%.3e\n",
	     GERSGamma, GERSSum, LTheta);
	} while(GERSSum > LTheta);

	INFO(info, 2)
	  ("GERS coarsening with gamma = %.3lf\n", GERSGamma);      
      }

      finishMarking(adaptInfo);

      Flag markFlag;
      if(elMarkRefine) markFlag = 1;
      if(elMarkCoarsen) markFlag |= 2;
      return(markFlag); 
    };

  protected:
    /** \brief
     * Refinement marking function.
     */
    void markElementForRefinement(AdaptInfo *adaptInfo, ElInfo *elInfo) {
      Element *el = elInfo->getElement();
      double lError = el->getEstimation(row);

      if (lError > markRLimit) {
	GERSSum += lError;
	setMark(el, adaptInfo->getRefineBisections(row == -1 ? 0 : row));
      }
    };

    /** \brief
     * Coarsening marking function.
     */
    void markElementForCoarsening(AdaptInfo *adaptInfo, ElInfo *elInfo) {
      Element *el = elInfo->getElement();
      double lError = el->getEstimation(row);

      if(el->getMark() <= 0) {
	if(el->getElementData()->getElementData(COARSENABLE)) {
	  lError += el->getCoarseningEstimation(row);
	}
      
	if(lError <= markCLimit) {
	  GERSSum += lError;
	  setMark(el, -adaptInfo->getCoarseBisections(row == -1 ? 0 : row));
	} else {
	  setMark(el, 0);
	}
      }
    };

  protected:
    /** \brief
     * Marking parameter.
     */
    double GERSSum;

    /** \brief
     * Marking parameter.
     */
    double oldErrSum;

    /** \brief
     * Marking parameter.
     */
    double GERSThetaStar;

    /** \brief
     * Marking parameter.
     */
    double GERSNu;

    /** \brief
     * Marking parameter.
     */
    double GERSThetaC;
  };

}

#endif