1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
//
// Write Abaqus file
//
//
#include <mystdlib.h>
#include <myadt.hpp>
#include <linalg.hpp>
#include <csg.hpp>
#include <meshing.hpp>
#include "writeuser.hpp"
namespace netgen
{
using std::vector;
struct AbaqusElementType
{
const char * name;
const vector<int> permutation;
AbaqusElementType(const char * name, const vector<int> & permutation)
: name(name), permutation(permutation)
{}
};
static inline const AbaqusElementType & GetAbaqusType(int dim, int num_nodes)
{
// maps num_nodes to AbaqusElementType for each dimension
typedef std::map<int, AbaqusElementType> AbaqusElementTypes;
static const std::map<int, AbaqusElementType> abaqus_eltypes[3] =
{
// 1D
AbaqusElementTypes{
{2, AbaqusElementType{"T2D2", vector{0,1}}},
},
// 2D
AbaqusElementTypes{
{3, AbaqusElementType{"CPS3", vector{0,1,2}}},
},
// 3D
AbaqusElementTypes{
{4, AbaqusElementType{"C3D4", vector{0,1,3,2}}},
{10, AbaqusElementType{"C3D10", vector{0,1,3,2,4,8,6,5,7,9}}},
}
};
const auto & eltypes = abaqus_eltypes[dim-1];
if (eltypes.count(num_nodes) > 0)
return eltypes.at(num_nodes);
else
throw Exception("unsupported " + ToString(dim)+"d Element type with " + ToString(num_nodes) + " nodes");
}
static void WritePoints ( const Mesh & mesh, ostream & out )
{
out << "*Node" << endl;
for(auto pi : mesh.Points().Range() )
{
out << pi+1-IndexBASE<PointIndex>() << ", ";
auto p = mesh[pi];
out << p[0] << ", " << p[1] << ", " << p[2] << '\n';
}
}
template <typename ElIndex>
static void WriteElement(ostream & out, const Mesh& mesh, ElIndex ei, const vector<int> & permutation, int & el_counter)
{
el_counter++;
auto el = mesh[ei];
out << el_counter;
for(auto i : Range(el.PNums()))
out << ", " << el[permutation[i]]+1-IndexBASE<PointIndex>();
out << '\n';
}
template <typename ElIndex, typename Elements>
static void WriteElements ( ostream & out, const Mesh & mesh, int dim, const Elements & el_range, int & el_counter)
{
// map index, num_nodes to elements
std::map<std::tuple<int, int>, Array<ElIndex>> elset_map;
for(auto ei : el_range)
{
const auto & el = mesh[ei];
int index = 0;
if constexpr(std::is_same_v<ElIndex,SegmentIndex>)
index = el.edgenr;
else
index = el.GetIndex();
elset_map[{index, el.GetNP()}].Append(ei);
}
for(auto & [key, elems] : elset_map)
{
auto [index, num_nodes] = key;
auto name = mesh.GetRegionName(elems[0]);
if (name == "") name = "default";
PrintMessage (5, index, ": ", name);
const auto & eltype = GetAbaqusType(dim, num_nodes) ;
out << "*Element, type=" << eltype.name << ", ELSET=" << name << endl;
for(auto ei : elems)
WriteElement(out, mesh, ei, eltype.permutation, el_counter);
}
}
void WriteAbaqusFormat (const Mesh & mesh,
const filesystem::path & filename)
{
PrintMessage (1, "Write Abaqus Mesh");
ofstream outfile (filename);
outfile << "*Heading" << endl;
outfile << " " << filename << endl;
outfile.precision(8);
int element_counter = 0;
WritePoints(mesh, outfile);
if(mesh.GetDimension() < 3)
WriteElements<SegmentIndex>(outfile, mesh, 1, mesh.LineSegments().Range(), element_counter);
WriteElements<SurfaceElementIndex>(outfile, mesh, 2, mesh.SurfaceElements().Range(), element_counter);
WriteElements<ElementIndex>(outfile, mesh, 3, mesh.VolumeElements().Range(), element_counter);
// Write identifications (untested!)
if (mesh.GetIdentifications().GetMaxNr())
{
const auto np = mesh.GetNP();
// periodic identification, implementation for
// Helmut J. Boehm, TU Vienna
auto mpcfilename = filename;
if (filename.extension() == ".inp")
mpcfilename.replace_extension(".mpc");
else
mpcfilename.concat(".mpc");
ofstream mpc (mpcfilename);
int masternode(0);
NgArray<INDEX_2> pairs;
NgBitArray master(np), help(np);
master.Set();
for (int i = 1; i <= 3; i++)
{
mesh.GetIdentifications().GetPairs (i, pairs);
help.Clear();
for (int j = 1; j <= pairs.Size(); j++)
{
help.Set (pairs.Get(j).I1());
}
master.And (help);
}
for (int i = 1; i <= np; i++)
if (master.Test(i))
masternode = i;
cout << "masternode = " << masternode << " = "
<< mesh.Point(masternode) << endl;
NgArray<int> minions(3);
for (int i = 1; i <= 3; i++)
{
mesh.GetIdentifications().GetPairs (i, pairs);
for (int j = 1; j <= pairs.Size(); j++)
{
if (pairs.Get(j).I1() == masternode)
minions.Elem(i) = pairs.Get(j).I2();
}
cout << "minion(" << i << ") = " << minions.Get(i)
<< " = " << mesh.Point(minions.Get(i)) << endl;
}
outfile << "**\n"
<< "*NSET,NSET=CTENODS\n"
<< minions.Get(1) << ", "
<< minions.Get(2) << ", "
<< minions.Get(3) << endl;
outfile << "**\n"
<< "**POINT_fixed\n"
<< "**\n"
<< "*BOUNDARY, OP=NEW\n";
for (int j = 1; j <= 3; j++)
outfile << masternode << ", " << j << ",, 0.\n";
outfile << "**\n"
<< "*BOUNDARY, OP=NEW\n";
for (int j = 1; j <= 3; j++)
{
Vec3d v(mesh.Point(masternode), mesh.Point(minions.Get(j)));
double vlen = v.Length();
int dir = 0;
if (fabs (v.X()) > 0.9 * vlen) dir = 2;
if (fabs (v.Y()) > 0.9 * vlen) dir = 3;
if (fabs (v.Z()) > 0.9 * vlen) dir = 1;
if (!dir)
cout << "ERROR: Problem with rigid body constraints" << endl;
outfile << minions.Get(j) << ", " << dir << ",, 0.\n";
}
outfile << "**\n"
<< "*EQUATION, INPUT=" << mpcfilename << endl;
NgBitArray eliminated(np);
eliminated.Clear();
for (int i = 1; i <= mesh.GetIdentifications().GetMaxNr(); i++)
{
mesh.GetIdentifications().GetPairs (i, pairs);
if (!pairs.Size())
continue;
for (int j = 1; j <= pairs.Size(); j++)
if (pairs.Get(j).I1() != masternode &&
!eliminated.Test(pairs.Get(j).I2()))
{
eliminated.Set (pairs.Get(j).I2());
for (int k = 1; k <= 3; k++)
{
mpc << "4" << "\n";
mpc << pairs.Get(j).I2() << "," << k << ", -1.0, ";
mpc << pairs.Get(j).I1() << "," << k << ", 1.0, ";
mpc << minions.Get(i) << "," << k << ", 1.0, ";
mpc << masternode << "," << k << ", -1.0 \n";
}
}
}
}
PrintMessage(1, "done");
}
static RegisterUserFormat reg_abaqus ("Abaqus Format", {".mesh"}, nullopt, WriteAbaqusFormat);
}
|
