PhaseFieldCrystal_.h 1.63 KB
Newer Older
Praetorius, Simon's avatar
Praetorius, Simon committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
/** \file PhaseFieldCrystal_.h */

#ifndef PHASE_FIELD_CRYSTAL_PRECON_H_
#define PHASE_FIELD_CRYSTAL_PRECON_H_

#include "AMDiS.h"
#include "BaseProblem.h"
#include "ExtendedProblemStat.h"

using namespace AMDiS;

/** Phase-field Crystal problem
 */
class PhaseFieldCrystal_ : public BaseProblem<ExtendedProblemStat>
{
public: // typedefs

  typedef BaseProblem<ExtendedProblemStat> super;

public:
21
 
Praetorius, Simon's avatar
Praetorius, Simon committed
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
  PhaseFieldCrystal_(const std::string &name_, bool createProblem = true);
  ~PhaseFieldCrystal_() {}

  double *getTempParameter() { return &tempParameter; }

  virtual void fillOperators();
  virtual void fillBoundaryConditions();

protected:

  bool useMobility;

  double tempParameter;
  double r;
  double rho0;
  double density;
  double two;
  double minus2;
};


/** \ingroup MainInstat
 * \brief
 * Abstract function to calculate the pure PFC-Energy
 */
class Energy : public BinaryAbstractFunction<double,double,double>
{
  public:
    Energy() : BinaryAbstractFunction<double,double,double>(4) { }

    double operator()(const double &rho, const double &mu) const {
      return -0.25*sqr(sqr(rho)) + 0.5*rho*mu; }
};


class MobilityPfc : public AbstractFunction<double,double>
{
  public:
    MobilityPfc(double density_ = -0.3, double factor_ = 1.0, int degree=1) : 
      AbstractFunction<double,double>(degree+1),
      density(density_),
      factor(factor_),
      delta(1.e-6) { }

    double operator()(const double &rho) const 
    {
      double mobility= abs(rho + 1.5)*factor;
      return std::max(mobility, 0.0);
    }
  
  protected:
    double density;
    double factor;
    double delta;
};

#endif // PHASE_FIELD_CRYSTAL_PRECON_H_