asolver_BiCGStab_Cmplx.h

Go to the documentation of this file.

 
#ifndef ASOLVER_BICGSTAB_Cmplx_H
#define ASOLVER_BICGSTAB_Cmplx_H
 
 
#include <string>
using std::string;
 
#include "lib_alt/Solver/asolver.h"
#include "lib/Fopr/afopr.h"
 
 
/*
    Uses a prescription to improve stability of BiCGStab.
    See G.L.G.Sleijpen and H.A.van der Vorst,
    Numerical Algorithms 10(1995)203-22.
 */
 
template<typename AFIELD>
class ASolver_BiCGStab_Cmplx : public ASolver<AFIELD>
{
 public:
  typedef typename AFIELD::real_t real_t;
  using ASolver<AFIELD>::m_vl;
  static const std::string class_name;
  using InitialGuess = typename ASolver<AFIELD>::InitialGuess;
 private:
 
  AFopr<AFIELD> *m_fopr;    
 
  int m_Niter;              
  real_t m_Stop_cond;       
 
  real_t m_Omega_tolerance; 
 
  real_t m_ecrit;           
 
  AFIELD *m_px;
  AFIELD m_r, m_p, m_rh, m_v, m_t;
 
  struct coeff_t
  {
    std::complex<real_t> rho;
    std::complex<real_t> alpha;
    std::complex<real_t> omega;
  };
 
 protected:
 
  int m_nconv;
 
  int m_init_mult;
 
  InitialGuess m_initial_mode;
 
  ASolver_BiCGStab_Cmplx() { }
 
 public:
  ASolver_BiCGStab_Cmplx(AFopr<AFIELD> *fopr)
    : m_fopr(fopr), m_Niter(0), m_Stop_cond(0.0L), m_initial_mode(InitialGuess::RHS)
  {
    vout.paranoiac("setting fopr to ASolver_BiCGStab_Cmplx: fopr=%p\n", fopr);
    this->init();
  }
 
  ~ASolver_BiCGStab_Cmplx() { this->tidyup(); }
 
  void set_parameters(const Parameters& params);
 
  void set_parameters(const int Niter, const real_t Stop_cond);
 
  void set_parameters(const int Niter, const real_t Stop_cond, const InitialGuess init_guess);
 
  void set_init_mode(const InitialGuess init_guess)
  {
    m_initial_mode = init_guess;
  }
 
  void set_parameters_BiCGStab_series(const real_t Omega_tolerance);
 
  void solve(AFIELD& xq, const AFIELD& b, int& nconv, real_t& diff);
 
  AFopr<AFIELD> *get_fopr() { return m_fopr; }
 
  double flop_count();
 
 
 protected:
 
  void init(void);
 
  void tidyup(void);
 
  void solve_init(const AFIELD& b, real_t& rr, coeff_t&, const real_t scale, const InitialGuess);
  void solve_init_RHS(const AFIELD& b, real_t& rr, coeff_t&);
  void solve_init_ZERO(const AFIELD& b, real_t& rr, coeff_t&);
  void solve_init_GIVEN(const AFIELD& b, real_t& rr, coeff_t&, const real_t);
 
  void solve_step(real_t& rr, int& iflg, coeff_t&);
 
#ifdef USE_FACTORY
 private:
  static ASolver<AFIELD> *create_object_with_fopr(AFopr<AFIELD> *fopr)
  {
    return new ASolver_BiCGStab_Cmplx<AFIELD>(fopr);
  }
 
 public:
  static bool register_factory()
  {
    return ASolver<AFIELD>::Factory_fopr::Register("BiCGStab_Cmplx", create_object_with_fopr);
  }
#endif
};
 
#endif // ASOLVER_BICGSTAB_Cmplx_H