mirror of
https://github.com/NGSolve/netgen.git
synced 2024-09-22 17:52:50 +05:00
487 lines
9.7 KiB
C++
487 lines
9.7 KiB
C++
#include <mystdlib.h>
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#include "meshing.hpp"
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namespace netgen
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{
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void Refinement :: MakeSecondOrder (Mesh & mesh)
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{
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int nseg, nse, ne;
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mesh.ComputeNVertices();
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mesh.SetNP(mesh.GetNV());
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INDEX_2_HASHTABLE<int> between(mesh.GetNP() + 5);
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bool thinlayers = 0;
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for (ElementIndex ei = 0; ei < mesh.GetNE(); ei++)
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if (mesh[ei].GetType() == PRISM ||
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mesh[ei].GetType() == PRISM12)
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thinlayers = 1;
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nseg = mesh.GetNSeg();
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for (SegmentIndex si = 0; si < nseg; si++)
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{
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Segment & el = mesh.LineSegment(si);
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INDEX_2 i2 = INDEX_2::Sort (el[0], el[1]);
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if (between.Used(i2))
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el[2] = between.Get(i2);
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else
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{
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Point<3> pb;
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EdgePointGeomInfo ngi;
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PointBetween (mesh.Point (el[0]),
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mesh.Point (el[1]), 0.5,
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el.surfnr1, el.surfnr2,
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el.epgeominfo[0], el.epgeominfo[1],
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pb, ngi);
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el[2] = mesh.AddPoint (pb);
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between.Set (i2, el[2]);
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}
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}
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// refine surface elements
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nse = mesh.GetNSE();
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for (SurfaceElementIndex sei = 0; sei < nse; sei++)
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{
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int j;
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const Element2d & el = mesh.SurfaceElement(sei);
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int onp(0);
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Element2d newel;
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newel.SetIndex (el.GetIndex());
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static int betw_trig[3][3] =
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{ { 1, 2, 3 },
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{ 0, 2, 4 },
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{ 0, 1, 5 } };
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static int betw_quad6[2][3] =
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{ { 0, 1, 4 },
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{ 3, 2, 5 } };
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static int betw_quad8[4][3] =
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{ { 0, 1, 4 },
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{ 3, 2, 5 },
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{ 0, 3, 6 },
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{ 1, 2, 7 } };
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int (*betw)[3] = NULL;
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switch (el.GetType())
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{
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case TRIG:
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case TRIG6:
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{
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betw = betw_trig;
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newel.SetType (TRIG6);
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onp = 3;
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break;
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}
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case QUAD:
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case QUAD6:
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case QUAD8:
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{
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if (thinlayers)
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{
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betw = betw_quad6;
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newel.SetType (QUAD6);
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}
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else
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{
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betw = betw_quad8;
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newel.SetType (QUAD8);
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}
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onp = 4;
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break;
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}
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default:
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PrintSysError ("Unhandled element in secondorder:", int(el.GetType()));
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}
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for (j = 0; j < onp; j++)
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newel[j] = el[j];
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int nnp = newel.GetNP();
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for (j = 0; j < nnp-onp; j++)
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{
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int pi1 = newel[betw[j][0]];
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int pi2 = newel[betw[j][1]];
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INDEX_2 i2 = INDEX_2::Sort (pi1, pi2);
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if (between.Used(i2))
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newel[onp+j] = between.Get(i2);
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else
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{
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Point<3> pb;
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PointGeomInfo newgi;
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PointBetween (mesh.Point (pi1),
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mesh.Point (pi2), 0.5,
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mesh.GetFaceDescriptor(el.GetIndex ()).SurfNr(),
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el.GeomInfoPi (betw[j][0]+1),
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el.GeomInfoPi (betw[j][1]+1),
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pb, newgi);
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newel[onp+j] = mesh.AddPoint (pb);
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between.Set (i2, newel[onp+j]);
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}
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}
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mesh.SurfaceElement(sei) = newel;
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}
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// int i, j;
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// refine volume elements
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ne = mesh.GetNE();
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for (int i = 1; i <= ne; i++)
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{
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const Element & el = mesh.VolumeElement(i);
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int onp(0);
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Element newel;
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newel.SetIndex (el.GetIndex());
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static int betw_tet[6][3] =
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{ { 0, 1, 4 },
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{ 0, 2, 5 },
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{ 0, 3, 6 },
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{ 1, 2, 7 },
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{ 1, 3, 8 },
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{ 2, 3, 9 } };
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static int betw_prism[6][3] =
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{
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{ 0, 2, 6 },
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{ 0, 1, 7 },
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{ 1, 2, 8 },
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{ 3, 5, 9 },
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{ 3, 4, 10 },
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{ 4, 5, 11 },
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};
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int (*betw)[3] = NULL;
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switch (el.GetType())
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{
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case TET:
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case TET10:
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{
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betw = betw_tet;
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newel.SetType (TET10);
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onp = 4;
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break;
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}
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case PRISM:
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case PRISM12:
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{
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betw = betw_prism;
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newel.SetType (PRISM12);
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onp = 6;
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break;
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}
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default:
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PrintSysError ("MakeSecondOrder, illegal vol type ", el.GetType());
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}
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for (int j = 1; j <= onp; j++)
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newel.PNum(j) = el.PNum(j);
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int nnp = newel.GetNP();
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for (int j = 0; j < nnp-onp; j++)
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{
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INDEX_2 i2(newel[betw[j][0]],
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newel[betw[j][1]]);
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i2.Sort();
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if (between.Used(i2))
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newel.PNum(onp+1+j) = between.Get(i2);
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else
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{
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newel.PNum(onp+1+j) = mesh.AddPoint
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(Center (mesh.Point(i2.I1()),
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mesh.Point(i2.I2())));
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between.Set (i2, newel.PNum(onp+1+j));
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}
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}
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mesh.VolumeElement (i) = newel;
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}
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// makes problems after linear mesh refinement, since
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// 2nd order identifications are not removed
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// update identification tables
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for (int i = 1; i <= mesh.GetIdentifications().GetMaxNr(); i++)
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{
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Array<int,PointIndex::BASE> identmap;
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mesh.GetIdentifications().GetMap (i, identmap);
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for (INDEX_2_HASHTABLE<int>::Iterator it = between.Begin();
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it != between.End(); it++)
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{
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INDEX_2 i2;
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int newpi;
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between.GetData (it, i2, newpi);
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INDEX_2 oi2(identmap.Get(i2.I1()),
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identmap.Get(i2.I2()));
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oi2.Sort();
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if (between.Used (oi2))
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{
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int onewpi = between.Get(oi2);
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mesh.GetIdentifications().Add (newpi, onewpi, i);
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}
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}
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/*
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for (int j = 1; j <= between.GetNBags(); j++)
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for (int k = 1; k <= between.GetBagSize(j); k++)
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{
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INDEX_2 i2;
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int newpi;
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between.GetData (j, k, i2, newpi);
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INDEX_2 oi2(identmap.Get(i2.I1()),
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identmap.Get(i2.I2()));
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oi2.Sort();
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if (between.Used (oi2))
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{
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int onewpi = between.Get(oi2);
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mesh.GetIdentifications().Add (newpi, onewpi, i);
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}
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}
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*/
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}
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// mesh.mglevels++;
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int oldsize = mesh.mlbetweennodes.Size();
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mesh.mlbetweennodes.SetSize(mesh.GetNP());
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for (int i = oldsize; i < mesh.GetNP(); i++)
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mesh.mlbetweennodes[i] = INDEX_2(0,0);
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/*
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for (i = 1; i <= between.GetNBags(); i++)
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for (j = 1; j <= between.GetBagSize(i); j++)
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{
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INDEX_2 oldp;
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int newp;
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between.GetData (i, j, oldp, newp);
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mesh.mlbetweennodes.Elem(newp) = oldp;
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}
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*/
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for (INDEX_2_HASHTABLE<int>::Iterator it = between.Begin();
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it != between.End(); it++)
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{
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mesh.mlbetweennodes[between.GetData (it)] = between.GetHash(it);
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}
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mesh.ComputeNVertices();
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// ValidateSecondOrder (mesh);
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}
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void Refinement :: ValidateSecondOrder (Mesh & mesh)
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{
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PrintMessage (3, "Validate mesh");
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int np = mesh.GetNP();
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int ne = mesh.GetNE();
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// int i, j;
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Array<INDEX_2> parents(np);
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for (int i = 1; i <= np; i++)
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parents.Elem(i) = INDEX_2(0,0);
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for (int i = 1; i <= ne; i++)
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{
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const Element & el = mesh.VolumeElement(i);
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if (el.GetType() == TET10)
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{
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static int betweentab[6][3] =
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{ { 1, 2, 5 },
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{ 1, 3, 6 },
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{ 1, 4, 7 },
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{ 2, 3, 8 },
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{ 2, 4, 9 },
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{ 3, 4, 10 } };
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for (int j = 0; j < 6; j++)
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{
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int f1 = el.PNum (betweentab[j][0]);
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int f2 = el.PNum (betweentab[j][1]);
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int son = el.PNum (betweentab[j][2]);
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parents.Elem(son).I1() = f1;
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parents.Elem(son).I2() = f2;
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}
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}
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}
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ValidateRefinedMesh (mesh, parents);
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}
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void Refinement ::
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ValidateRefinedMesh (Mesh & mesh,
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Array<INDEX_2> & parents)
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{
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// int i, j, k;
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// homotopy method
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int ne = mesh.GetNE();
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int cnttrials = 100;
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int wrongels = 0;
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for (int i = 1; i <= ne; i++)
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if (mesh.VolumeElement(i).CalcJacobianBadness (mesh.Points()) > 1e10)
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{
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wrongels++;
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mesh.VolumeElement(i).flags.badel = 1;
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}
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else
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mesh.VolumeElement(i).flags.badel = 0;
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double facok = 0;
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double factry;
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BitArray illegalels(ne);
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illegalels.Clear();
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if (wrongels)
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{
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cout << "WARNING: " << wrongels << " illegal element(s) found" << endl;
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int np = mesh.GetNP();
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Array<Point<3> > should(np);
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Array<Point<3> > can(np);
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for (int i = 1; i <= np; i++)
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{
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should.Elem(i) = can.Elem(i) = mesh.Point(i);
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}
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for (int i = 1; i <= parents.Size(); i++)
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{
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if (parents.Get(i).I1())
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can.Elem(i) = Center (can.Elem(parents.Get(i).I1()),
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can.Elem(parents.Get(i).I2()));
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}
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BitArray boundp(np);
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boundp.Clear();
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for (int i = 1; i <= mesh.GetNSE(); i++)
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{
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const Element2d & sel = mesh.SurfaceElement(i);
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for (int j = 1; j <= sel.GetNP(); j++)
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boundp.Set(sel.PNum(j));
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}
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(*testout) << "bpoints:" << endl;
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for (int i = 1; i <= np; i++)
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if (boundp.Test(i))
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(*testout) << i << endl;
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double lam = 0.5;
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while (facok < 1-1e-8 && cnttrials > 0)
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{
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lam *= 4;
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if (lam > 2) lam = 2;
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do
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{
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// cout << "trials: " << cnttrials << endl;
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lam *= 0.5;
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cnttrials--;
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cout << "lam = " << lam << endl;
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factry = lam + (1-lam) * facok;
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cout << "trying: " << factry << endl;
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for (int i = 1; i <= np; i++)
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if (boundp.Test(i))
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{
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for (int j = 0; j < 3; j++)
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mesh.Point(i)(j) =
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lam * should.Get(i)(j) +
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(1-lam) * can.Get(i)(j);
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}
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else
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mesh.Point(i) = Point<3> (can.Get(i));
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// (*testout) << "bad els: " << endl;
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wrongels = 0;
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for (int i = 1; i <= ne; i++)
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{
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if (!illegalels.Test(i) &&
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mesh.VolumeElement(i).
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CalcJacobianBadness(mesh.Points()) > 1e10)
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{
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wrongels++;
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Element & el = mesh.VolumeElement(i);
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el.flags.badel = 1;
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if (lam < 1e-4)
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illegalels.Set(i);
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/*
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(*testout) << i << ": ";
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for (j = 1; j <= el.GetNP(); j++)
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(*testout) << el.PNum(j) << " ";
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(*testout) << endl;
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*/
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}
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else
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mesh.VolumeElement(i).flags.badel = 0;
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}
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cout << "wrongels = " << wrongels << endl;
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}
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while (wrongels && cnttrials > 0);
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mesh.CalcSurfacesOfNode();
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mesh.ImproveMeshJacobian (OPT_WORSTCASE);
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facok = factry;
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for (int i = 1; i <= np; i++)
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can.Elem(i) = mesh.Point(i);
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}
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}
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for (int i = 1; i <= ne; i++)
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{
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if (illegalels.Test(i))
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{
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cout << "illegal element: " << i << endl;
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mesh.VolumeElement(i).flags.badel = 1;
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}
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else
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mesh.VolumeElement(i).flags.badel = 0;
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}
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/*
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if (cnttrials <= 0)
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{
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cerr << "ERROR: Sorry, illegal elements:" << endl;
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}
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*/
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}
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}
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