mnsolver.cpp 10.5 KB
Newer Older
1
#include "solvers/mnsolver.h"
2
3
#include "common/config.h"
#include "common/io.h"
4
5
6
7
8
#include "entropies/entropybase.h"
#include "fluxes/numericalflux.h"
#include "optimizers/optimizerbase.h"
#include "quadratures/quadraturebase.h"
#include "solvers/sphericalharmonics.h"
9
#include "toolboxes/errormessages.h"
10
#include "toolboxes/textprocessingtoolbox.h"
11

12
// externals
13
#include "spdlog/spdlog.h"
14
#include <mpi.h>
steffen.schotthoefer's avatar
steffen.schotthoefer committed
15

16
#include <fstream>
17
18
//#include <chrono>

19
MNSolver::MNSolver( Config* settings ) : Solver( settings ) {
steffen.schotthoefer's avatar
steffen.schotthoefer committed
20

21
    // Is this good (fast) code using a constructor list?
22
23
    _LMaxDegree    = settings->GetMaxMomentDegree();
    _nTotalEntries = GlobalIndex( _LMaxDegree, int( _LMaxDegree ) ) + 1;
24
25
26
27
28
29
30

    // build quadrature object and store quadrature points and weights
    _quadPoints       = _quadrature->GetPoints();
    _weights          = _quadrature->GetWeights();
    _nq               = _quadrature->GetNq();
    _quadPointsSphere = _quadrature->GetPointsSphere();
    _settings->SetNQuadPoints( _nq );
31

steffen.schotthoefer's avatar
steffen.schotthoefer committed
32
33
34
35
36
37
38
39
40
41
42
43
44
45
    // transform sigmaT and sigmaS in sigmaA.
    _sigmaA = VectorVector( _nEnergies, Vector( _nCells, 0 ) );    // Get rid of this extra vektor!

    for( unsigned n = 0; n < _nEnergies; n++ ) {
        for( unsigned j = 0; j < _nCells; j++ ) {
            _sigmaA[n][j] = 0;    //_sigmaT[n][j] - _sigmaS[n][j];
            _sigmaS[n][j] = 1;
        }
    }

    // Initialize Scatter Matrix
    _scatterMatDiag    = Vector( _nTotalEntries, 1.0 );
    _scatterMatDiag[0] = 0.0;    // First entry is zero by construction.

46
47
48
49
50
    // Initialize Entropy
    _entropy = EntropyBase::Create( _settings );

    // Initialize Optimizer
    _optimizer = OptimizerBase::Create( _settings );
steffen.schotthoefer's avatar
steffen.schotthoefer committed
51

52
53
    // Initialize lagrange Multiplier
    _alpha = VectorVector( _nCells, Vector( _nTotalEntries, 0.0 ) );
54
55

    // Initialize and Pre-Compute Moments at quadrature points
56
    _basis = new SphericalHarmonics( _LMaxDegree );
57

58
    _moments = VectorVector( _nq, Vector( _nTotalEntries, 0.0 ) );
59
    ComputeMoments();
60
61

    // Solver output
62
    PrepareOutputFields();
steffen.schotthoefer's avatar
steffen.schotthoefer committed
63
64
}

65
66
67
MNSolver::~MNSolver() {
    delete _entropy;
    delete _optimizer;
68
    delete _basis;
69
}
70

steffen.schotthoefer's avatar
steffen.schotthoefer committed
71
72
73
74
75
76
int MNSolver::GlobalIndex( int l, int k ) const {
    int numIndicesPrevLevel  = l * l;    // number of previous indices untill level l-1
    int prevIndicesThisLevel = k + l;    // number of previous indices in current level
    return numIndicesPrevLevel + prevIndicesThisLevel;
}

77
void MNSolver::ComputeMoments() {
steffen.schotthoefer's avatar
steffen.schotthoefer committed
78
    double my, phi;
79
80

    for( unsigned idx_quad = 0; idx_quad < _nq; idx_quad++ ) {
81
82
        my  = _quadPointsSphere[idx_quad][0];
        phi = _quadPointsSphere[idx_quad][1];
83

84
        _moments[idx_quad] = _basis->ComputeSphericalBasis( my, phi );
85
    }
86
87
88
89
90
}

Vector MNSolver::ConstructFlux( unsigned idx_cell ) {

    // ---- Integration of Moment of flux ----
91
    double entropyL, entropyR, entropyFlux;
92

93
    Vector flux( _nTotalEntries, 0.0 );
94

95
    for( unsigned idx_quad = 0; idx_quad < _nq; idx_quad++ ) {
96
97
98

        entropyFlux = 0.0;    // Reset temorary flux

99
100
        entropyL = _entropy->EntropyPrimeDual( blaze::dot( _alpha[idx_cell], _moments[idx_quad] ) );

101
102
103
104
105
        for( unsigned idx_neigh = 0; idx_neigh < _neighbors[idx_cell].size(); idx_neigh++ ) {
            // Store fluxes in psiNew, to save memory
            if( _boundaryCells[idx_cell] == BOUNDARY_TYPE::NEUMANN && _neighbors[idx_cell][idx_neigh] == _nCells )
                entropyR = entropyL;
            else {
106
                entropyR = _entropy->EntropyPrimeDual( blaze::dot( _alpha[_neighbors[idx_cell][idx_neigh]], _moments[idx_quad] ) );
107
            }
108
            entropyFlux += _g->Flux( _quadPoints[idx_quad], entropyL, entropyR, _normals[idx_cell][idx_neigh] );
109
        }
110
        flux += _moments[idx_quad] * ( _weights[idx_quad] * entropyFlux );
111
112

        // ------- Relizablity Reconstruction Step ----
113
    }
114
    return flux;
115
116
}

117
118
void MNSolver::ComputeRealizableSolution( unsigned idx_cell ) {
    double entropyReconstruction = 0.0;
119
    _sol[idx_cell]               = 0;
120
    for( unsigned idx_quad = 0; idx_quad < _nq; idx_quad++ ) {
121
        // Make entropyReconstruction a member vector, s.t. it does not have to be re-evaluated in ConstructFlux
122
        entropyReconstruction = _entropy->EntropyPrimeDual( blaze::dot( _alpha[idx_cell], _moments[idx_quad] ) );
123
        _sol[idx_cell] += _moments[idx_quad] * ( _weights[idx_quad] * entropyReconstruction );
124
125
126
    }
}

steffen.schotthoefer's avatar
steffen.schotthoefer committed
127
128
129
130
131
132
133
134
void MNSolver::Solve() {

    int rank;
    MPI_Comm_rank( MPI_COMM_WORLD, &rank );

    auto log = spdlog::get( "event" );

    // angular flux at next time step (maybe store angular flux at all time steps, since time becomes energy?)
135
    VectorVector psiNew = _sol;
steffen.schotthoefer's avatar
steffen.schotthoefer committed
136

137
    double mass = 0;
138
139
140

    Save( -1 );

141
142
143
    if( rank == 0 ) log->info( "{:10}  {:10}", "t", "mass" );

    // if( rank == 0 ) log->info( "{:03.8f}   {:01.5e} {:01.5e}", -1.0, dFlux, mass1 ); Should be deleted
steffen.schotthoefer's avatar
steffen.schotthoefer committed
144
145

    // Loop over energies (pseudo-time of continuous slowing down approach)
146
    for( unsigned idx_energy = 0; idx_energy < _nEnergies; idx_energy++ ) {
steffen.schotthoefer's avatar
steffen.schotthoefer committed
147

148
        // ------- Reconstruction Step ----------------
149

150
        _optimizer->SolveMultiCell( _alpha, _sol, _moments );
151

152
153
        // Loop over the grid cells
        for( unsigned idx_cell = 0; idx_cell < _nCells; idx_cell++ ) {
154

155
156
            // ------- Relizablity Reconstruction Step ----

157
            ComputeRealizableSolution( idx_cell );
158
159

            // ------- Flux Computation Step --------------
160

161
162
            // Dirichlet Boundaries are finished now
            if( _boundaryCells[idx_cell] == BOUNDARY_TYPE::DIRICHLET ) continue;
steffen.schotthoefer's avatar
steffen.schotthoefer committed
163

164
            psiNew[idx_cell] = ConstructFlux( idx_cell );
165

166
            // ------ Finite Volume Update Step ------
167

168
169
170
            // NEED TO VECTORIZE
            for( unsigned idx_system = 0; idx_system < _nTotalEntries; idx_system++ ) {

171
                psiNew[idx_cell][idx_system] = _sol[idx_cell][idx_system] -
172
                                               ( _dE / _areas[idx_cell] ) * psiNew[idx_cell][idx_system] /* cell averaged flux */
173
                                               - _dE * _sol[idx_cell][idx_system] *
174
175
                                                     ( _sigmaA[idx_energy][idx_cell]                                    /* absorbtion influence */
                                                       + _sigmaS[idx_energy][idx_cell] * _scatterMatDiag[idx_system] ); /* scattering influence */
176
            }
steffen.schotthoefer's avatar
steffen.schotthoefer committed
177
        }
178

179
180
        // Update Solution
        _sol = psiNew;
181

182
183
        // --- VTK and CSV Output ---
        mass = WriteOutputFields();
184
        Save( idx_energy );
185
        WriteNNTrainingData( idx_energy );
186

187
        // --- Screen Output ---
188
        if( rank == 0 ) log->info( "{:03.8f}   {:01.5e}", _energies[idx_energy], mass );
steffen.schotthoefer's avatar
steffen.schotthoefer committed
189
190
    }
}
191

192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
void MNSolver::PrepareOutputFields() {
    unsigned nGroups = (unsigned)_settings->GetNVolumeOutput();

    _outputFieldNames.resize( nGroups );
    _outputFields.resize( nGroups );

    // Prepare all OutputGroups ==> Specified in option VOLUME_OUTPUT
    for( unsigned idx_group = 0; idx_group < nGroups; idx_group++ ) {
        // Prepare all Output Fields per group

        // Different procedure, depending on the Group...
        switch( _settings->GetVolumeOutput()[idx_group] ) {
            case MINIMAL:
                // Currently only one entry ==> rad flux
                _outputFields[idx_group].resize( 1 );
                _outputFieldNames[idx_group].resize( 1 );

209
210
                _outputFields[idx_group][0].resize( _nCells );
                _outputFieldNames[idx_group][0] = "radiation flux density";
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
                break;

            case MOMENTS:
                // As many entries as there are moments in the system
                _outputFields[idx_group].resize( _nTotalEntries );
                _outputFieldNames[idx_group].resize( _nTotalEntries );

                for( int idx_l = 0; idx_l <= (int)_LMaxDegree; idx_l++ ) {
                    for( int idx_k = -idx_l; idx_k <= idx_l; idx_k++ ) {
                        _outputFields[idx_group][GlobalIndex( idx_l, idx_k )].resize( _nCells );

                        _outputFieldNames[idx_group][GlobalIndex( idx_l, idx_k )] =
                            std::string( "u_" + std::to_string( idx_l ) + "^" + std::to_string( idx_k ) );
                    }
                }
                break;
            default: ErrorMessages::Error( "Volume Output Group not defined for MN Solver!", CURRENT_FUNCTION ); break;
        }
    }
}

232
double MNSolver::WriteOutputFields() {
233
234
    double mass      = 0.0;
    unsigned nGroups = (unsigned)_settings->GetNVolumeOutput();
235

236
237
238
    // Compute total "mass" of the system ==> to check conservation properties
    for( unsigned idx_cell = 0; idx_cell < _nCells; ++idx_cell ) {
        mass += _sol[idx_cell][0] * _areas[idx_cell];    // Should probably go to postprocessing
239
240
    }

241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
    for( unsigned idx_group = 0; idx_group < nGroups; idx_group++ ) {
        switch( _settings->GetVolumeOutput()[idx_group] ) {
            case MINIMAL:
                for( unsigned idx_cell = 0; idx_cell < _nCells; ++idx_cell ) {
                    _outputFields[idx_group][0][idx_cell] = _sol[idx_cell][0];
                }
                break;
            case MOMENTS:
                for( unsigned idx_sys = 0; idx_sys < _nTotalEntries; idx_sys++ ) {
                    for( unsigned idx_cell = 0; idx_cell < _nCells; ++idx_cell ) {
                        _outputFields[idx_group][idx_sys][idx_cell] = _sol[idx_cell][idx_sys];
                    }
                }
                break;
            default: ErrorMessages::Error( "Volume Output Group not defined for MN Solver!", CURRENT_FUNCTION ); break;
        }
    }
258
259
    return mass;
}
260

261
void MNSolver::Save() const { ExportVTK( _settings->GetOutputFile(), _outputFields, _outputFieldNames, _mesh ); }
262

263
void MNSolver::Save( int currEnergy ) const {
264
    ExportVTK( _settings->GetOutputFile() + "_" + std::to_string( currEnergy ), _outputFields, _outputFieldNames, _mesh );
265
}
266
267
268
269
270
271
272

void MNSolver::WriteNNTrainingData( unsigned idx_pseudoTime ) {
    std::string filename = "trainNN.csv";
    std::ofstream myfile;
    myfile.open( filename, std::ofstream::app );

    for( unsigned idx_cell = 0; idx_cell < _nCells; idx_cell++ ) {
273
        myfile << 0 << ", " << _nTotalEntries << "," << idx_pseudoTime;
274
        for( unsigned idx_sys = 0; idx_sys < _nTotalEntries; idx_sys++ ) {
275
            myfile << "," << _sol[idx_cell][idx_sys];
276
        }
277
        myfile << " \n" << 1 << ", " << _nTotalEntries << "," << idx_pseudoTime;
278
        for( unsigned idx_sys = 0; idx_sys < _nTotalEntries; idx_sys++ ) {
279
            myfile << "," << _alpha[idx_cell][idx_sys];
280
        }
281
        myfile << "\n";
282
283
284
    }
    myfile.close();
}