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BiCGStabSmoother.H

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/* _______              __
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//
// This software is copyright (C) by the Lawrence Berkeley
// National Laboratory.  Permission is granted to reproduce
// this software for non-commercial purposes provided that
// this notice is left intact.
// 
// It is acknowledged that the U.S. Government has rights to
// this software under Contract DE-AC03-765F00098 between
// the U.S.  Department of Energy and the University of
// California.
//
// This software is provided as a professional and academic
// contribution for joint exchange. Thus it is experimental,
// is provided ``as is'', with no warranties of any kind
// whatsoever, no support, no promise of updates, or printed
// documentation. By using this software, you acknowledge
// that the Lawrence Berkeley National Laboratory and
// Regents of the University of California shall have no
// liability with respect to the infringement of other
// copyrights by any part of this software.
//
// DFMartin, Sun, May 5, 2002

#ifndef _BiCGStabSmoother_H_
#define _BiCGStabSmoother_H_

#include <iostream>
#include <math.h>
#include <assert.h>
#include <stdlib.h>
#include <REAL.H>
#include <IntVect.H>
#include <Box.H>
#include <DisjointBoxLayout.H>
#include <LevelData.H>
#include <FArrayBox.H>
#include <ProblemDomain.H>
#include "BaseBottomSmoother.H"


class BiCGStabSmoother : public BaseBottomSmoother
{

public:



  BiCGStabSmoother();

  virtual ~BiCGStabSmoother();


  virtual BaseBottomSmoother* new_bottomSmoother() const;


  void setMaxIter(int a_max_iter);


  void setSolverTol(Real a_solver_tol);
  

  void setEnableRestart(bool a_enable_restart);


  void setVerbose(bool a_verbose);



  virtual void doBottomSmooth(LevelData<FArrayBox>& a_phi,
                              const LevelData<FArrayBox>& a_rhs,
                              LevelOp* a_levelop_ptr);

protected:

  int m_maxIter;

  Real m_solver_tol;
  
  // small parameter to check for division by zero
  Real m_small;

  // small parameter to check for size of correction (to prevent hanging)
  Real m_converge_small;

  // if true, enable restarting capability
  bool m_enable_restart;

  // default is false
  bool m_verbose;
  
};

#endif
  
  

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