/[escript]/trunk/finley/src/Mesh_findMatchingFaces.c
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Contents of /trunk/finley/src/Mesh_findMatchingFaces.c

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Revision 888 - (show annotations)
Tue Nov 7 08:31:26 2006 UTC (12 years, 11 months ago) by gross
File MIME type: text/plain
File size: 9217 byte(s)
Problem in Mesh_findMatchingFaces.c fixed:
default tolerance in python interface was set too tight.



1 /*
2 ************************************************************
3 * Copyright 2006 by ACcESS MNRF *
4 * *
5 * http://www.access.edu.au *
6 * Primary Business: Queensland, Australia *
7 * Licensed under the Open Software License version 3.0 *
8 * http://www.opensource.org/licenses/osl-3.0.php *
9 * *
10 ************************************************************
11 */
12
13 /**************************************************************/
14
15 /* Finley: Mesh */
16
17 /* searches for faces in the mesh which are matching */
18
19 /**************************************************************/
20
21 /* Author: gross@access.edu.au */
22 /* Version: $Id$
23
24 /**************************************************************/
25
26 #include "Util.h"
27 #include "Mesh.h"
28 /**************************************************************/
29
30 static double Finley_Mesh_lockingGridSize=0;
31
32 int Finley_Mesh_findMatchingFaces_compar(const void *arg1 , const void *arg2 ) {
33 Finley_Mesh_findMatchingFaces_center *e1,*e2;
34 bool_t l,g;
35 dim_t i;
36 e1=(Finley_Mesh_findMatchingFaces_center*) arg1;
37 e2=(Finley_Mesh_findMatchingFaces_center*) arg2;
38 for (i=0;i<MAX_numDim;i++) {
39 l= (e1->x[i]<e2->x[i]+Finley_Mesh_lockingGridSize) ? TRUE : FALSE;
40 g= (e2->x[i]<e1->x[i]+Finley_Mesh_lockingGridSize) ? TRUE : FALSE;
41 if (! (l && g)) {
42 if (l) return -1;
43 if (g) return 1;
44 }
45 }
46 if ( e1->refId < e2->refId ) {
47 return -1;
48 } else if ( e1->refId > e2->refId ) {
49 return -1;
50 } else {
51 return 0;
52 }
53 }
54
55 void Finley_Mesh_findMatchingFaces(Finley_NodeFile *nodes, Finley_ElementFile *faces, double safety_factor,double tolerance,
56 dim_t* numPairs, index_t* elem0,index_t* elem1,index_t* matching_nodes_in_elem1) {
57 #define getDist(_dist_,_e0_,_i0_,_e1_,_i1_) \
58 {dim_t i; \
59 _dist_=0; \
60 for (i=0;i<numDim;i++) _dist_=MAX(_dist_,ABS(X[INDEX3(i,_i0_,_e0_,numDim,NN)]-X[INDEX3(i,_i1_,_e1_,numDim,NN)])); \
61 }
62
63 #define SWAP(_i1_,_i2_) \
64 {index_t* i; \
65 i=(_i2_); \
66 (_i2_)=(_i1_); \
67 (_i1_)=i; \
68 }
69
70 char error_msg[LenErrorMsg_MAX];
71 double h=DBLE(HUGE_VAL),h_local,dist,*X=NULL;
72 dim_t NN=faces->ReferenceElement->Type->numNodes;
73 dim_t numDim=nodes->numDim;
74 Finley_Mesh_findMatchingFaces_center *center;
75 index_t e_0,e_1,a1[NN],a2[NN],*perm,*perm_tmp;
76 dim_t e,i,i0,i1,n;
77
78 X=TMPMEMALLOC(NN*numDim*faces->numElements,double);
79 center=TMPMEMALLOC(faces->numElements,Finley_Mesh_findMatchingFaces_center);
80 if (!(Finley_checkPtr(X) || Finley_checkPtr(center)) ) {
81 /* OMP */
82 for (e=0;e<faces->numElements;e++) {
83 /* get the coordinates of the nodes */
84 Finley_Util_Gather_double(NN,&(faces->Nodes[INDEX2(0,e,NN)]),numDim,nodes->Coordinates,&(X[INDEX3(0,0,e,numDim,NN)]));
85 /* get the element center */
86 center[e].refId=e;
87 for (i=0;i<MAX_numDim;i++) center[e].x[i]=0;
88 for (i0=0;i0<faces->ReferenceElement->Type->numNodesOnFace;i0++) {
89 for (i=0;i<numDim;i++) center[e].x[i]+=X[INDEX3(i,faces->ReferenceElement->Type->faceNode[i0],e,numDim,NN)];
90 }
91 for (i=0;i<numDim;i++) center[e].x[i]/=faces->ReferenceElement->Type->numNodesOnFace;
92 /* get the minimum distance between nodes in the element */
93 for (i0=0;i0<faces->ReferenceElement->Type->numNodesOnFace;i0++) {
94 for (i1=i0+1;i1<faces->ReferenceElement->Type->numNodesOnFace;i1++) {
95 getDist(h_local,e,faces->ReferenceElement->Type->faceNode[i0],e,faces->ReferenceElement->Type->faceNode[i1]);
96 h=MIN(h,h_local);
97 }
98 }
99 }
100 /* set the */
101 Finley_Mesh_lockingGridSize=h*MAX(safety_factor,0);
102 #ifdef Finley_TRACE
103 printf("locking grid size is %e\n",Finley_Mesh_lockingGridSize);
104 printf("absolute tolerance is %e.\n",h * tolerance);
105 #endif
106 /* sort the elements by center center coordinates (lexigraphical)*/
107 qsort(center,faces->numElements,sizeof(Finley_Mesh_findMatchingFaces_center),Finley_Mesh_findMatchingFaces_compar);
108 /* find elements with matching center */
109 *numPairs=0;
110 /* OMP */
111 for (e=0;e<faces->numElements-1 && Finley_noError();e++) {
112 dist=0;
113 for (i=0;i<numDim;i++) dist=MAX(dist,ABS(center[e].x[i]-center[e+1].x[i]));
114 if (dist < h * tolerance) {
115 e_0=center[e].refId;
116 e_1=center[e+1].refId;
117 elem0[*numPairs]=e_0;
118 elem1[*numPairs]=e_1;
119 /* now the element e_1 is rotated such that the first node in element e_0 and e_1 have the same coordinates */
120 perm=a1;
121 perm_tmp=a2;
122 for (i=0;i<NN;i++) perm[i]=i;
123 while (Finley_noError()) {
124 /* if node 0 and perm[0] are the same we are ready */
125 getDist(dist,e_0,0,e_1,perm[0]);
126 if (dist<=h*tolerance) break;
127 if (faces->ReferenceElement->Type->shiftNodes[0]>=0) {
128 /* rotate the nodes */
129 for (i=0;i<NN;i++) perm_tmp[i]=perm[faces->ReferenceElement->Type->shiftNodes[i]];
130 SWAP(perm,perm_tmp);
131 }
132 /* if the permutation is back at the identity, ie. perm[0]=0, the faces don't match: */
133 if (perm[0]==0) {
134 sprintf(error_msg,"Mesh_findMatchingFaces:couldn't match first node of element %d to touching element %d",e_0,e_1);
135 Finley_setError(VALUE_ERROR,error_msg);
136 }
137 }
138 /* now we check if the second nodes match */
139 if (Finley_noError()) {
140 if (faces->ReferenceElement->Type->numNodesOnFace>1) {
141 getDist(dist,e_0,1,e_1,perm[faces->ReferenceElement->Type->faceNode[1]]);
142 /* if the second node does not match we reverse the direction of the nodes */
143 if (dist>h*tolerance) {
144 /* rotate the nodes */
145 if (faces->ReferenceElement->Type->reverseNodes[0]<0) {
146 sprintf(error_msg,"Mesh_findMatchingFaces:couldn't match the second node of element %d to touching element %d",e_0,e_1);
147 Finley_setError(VALUE_ERROR,error_msg);
148 } else {
149 for (i=0;i<NN;i++) perm_tmp[i]=perm[faces->ReferenceElement->Type->reverseNodes[i]];
150 SWAP(perm,perm_tmp);
151 getDist(dist,e_0,1,e_1,perm[faces->ReferenceElement->Type->faceNode[1]]);
152 if (dist>h*tolerance) {
153 sprintf(error_msg,"Mesh_findMatchingFaces:couldn't match the second node of element %d to touching element %d",e_0,e_1);
154 Finley_setError(VALUE_ERROR,error_msg);
155 }
156 }
157 }
158 }
159 }
160 /* we check if the rest of the face nodes match: */
161 if (Finley_noError()) {
162 for (i=2;i<faces->ReferenceElement->Type->numNodesOnFace;i++) {
163 n=faces->ReferenceElement->Type->faceNode[i];
164 getDist(dist,e_0,n,e_1,perm[n]);
165 if (dist>h*tolerance) {
166 sprintf(error_msg,"Mesh_findMatchingFaces:couldn't match the %d-th node of element %d to touching element %d",i,e_0,e_1);
167 Finley_setError(VALUE_ERROR,error_msg);
168 break;
169 }
170 }
171 }
172 /* copy over the permuted nodes of e_1 into matching_nodes_in_elem1 */
173 if (Finley_noError()) {
174 for (i=0;i<NN;i++) matching_nodes_in_elem1[INDEX2(i,*numPairs,NN)]=faces->Nodes[INDEX2(perm[i],e_1,NN)];
175 }
176 (*numPairs)++;
177 }
178 }
179 #ifdef Finley_TRACE
180 printf("number of pairs of matching faces %d\n",*numPairs);
181 #endif
182 }
183 /* clean up */
184 TMPMEMFREE(X);
185 TMPMEMFREE(center);
186
187 #undef getDist
188 #undef SWAP
189 }
190
191 /*
192 * $Log$
193 * Revision 1.6 2005/09/15 03:44:22 jgs
194 * Merge of development branch dev-02 back to main trunk on 2005-09-15
195 *
196 * Revision 1.5.2.1 2005/09/07 06:26:19 gross
197 * the solver from finley are put into the standalone package paso now
198 *
199 * Revision 1.5 2005/07/08 04:07:51 jgs
200 * Merge of development branch back to main trunk on 2005-07-08
201 *
202 * Revision 1.4 2004/12/15 07:08:32 jgs
203 * *** empty log message ***
204 * Revision 1.1.1.1.2.2 2005/06/29 02:34:51 gross
205 * some changes towards 64 integers in finley
206 *
207 * Revision 1.1.1.1.2.1 2004/11/24 01:37:14 gross
208 * some changes dealing with the integer overflow in memory allocation. Finley solves 4M unknowns now
209 *
210 *
211 *
212 */
213

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