bool EnrichmentItem :: tipIsTouchingEI(const TipInfo &iTipInfo)
{
double tol = 1.0e-9;
SpatialLocalizer *localizer = giveDomain()->giveSpatialLocalizer();
Element *tipEl = localizer->giveElementContainingPoint(iTipInfo.mGlobalCoord);
if ( tipEl != NULL ) {
// Check if the candidate tip is located on the current crack
FloatArray N;
FloatArray locCoord;
tipEl->computeLocalCoordinates(locCoord, iTipInfo.mGlobalCoord);
FEInterpolation *interp = tipEl->giveInterpolation();
interp->evalN( N, locCoord, FEIElementGeometryWrapper(tipEl) );
double normalSignDist;
evalLevelSetNormal( normalSignDist, iTipInfo.mGlobalCoord, N, tipEl->giveDofManArray() );
double tangSignDist;
evalLevelSetTangential( tangSignDist, iTipInfo.mGlobalCoord, N, tipEl->giveDofManArray() );
if ( fabs(normalSignDist) < tol && tangSignDist > tol ) {
return true;
}
}
return false;
}
int
PrimaryField :: __evaluateAt(FloatArray &answer, FloatArray& coords,
ValueModeType mode, TimeStep *atTime,
IntArray *dofId)
{
Element *bgelem;
Domain *domain = emodel->giveDomain(domainIndx);
SpatialLocalizer *sl = domain->giveSpatialLocalizer();
// locate background element
if ( ( bgelem = sl->giveElementContainingPoint(coords) ) == NULL ) {
//_error ("PrimaryField::evaluateAt: point not found in domain\n");
return 1;
}
EIPrimaryFieldInterface *interface = ( EIPrimaryFieldInterface * ) ( bgelem->giveInterface(EIPrimaryFieldInterfaceType) );
if ( interface ) {
if (dofId) {
return interface->EIPrimaryFieldI_evaluateFieldVectorAt(answer, * this, coords, *dofId, mode, atTime);
} else { // use element default dof id mask
IntArray elemDofId;
bgelem->giveElementDofIDMask(this->giveEquationID(), elemDofId);
return interface->EIPrimaryFieldI_evaluateFieldVectorAt(answer, * this, coords, elemDofId, mode, atTime);
}
} else {
_error("ScalarPrimaryField::operator(): background element does not support EIPrimaryFiledInterface\n");
return 1; // failed
}
}
void
MMAContainingElementProjection :: __init(Domain *dold, IntArray &type, FloatArray &coords, Set &elemSet, TimeStep *tStep, bool iCohesiveZoneGP)
{
SpatialLocalizer *sl = dold->giveSpatialLocalizer();
FloatArray jGpCoords;
double distance, minDist = 1.e6;
Element *srcElem;
if ( ( srcElem = sl->giveElementContainingPoint(coords, elemSet) ) ) {
this->source = NULL;
for ( GaussPoint *jGp: *srcElem->giveDefaultIntegrationRulePtr() ) {
if ( srcElem->computeGlobalCoordinates( jGpCoords, jGp->giveNaturalCoordinates() ) ) {
distance = coords.distance(jGpCoords);
if ( distance < minDist ) {
minDist = distance;
this->source = jGp;
}
}
}
if ( !source ) {
OOFEM_ERROR("no suitable source found");
}
} else {
OOFEM_ERROR("No suitable element found");
}
}
bool PLCrackPrescribedDir :: propagateInterface(Domain &iDomain, EnrichmentFront &iEnrFront, TipPropagation &oTipProp)
{
if ( !iEnrFront.propagationIsAllowed() ) {
return false;
}
const TipInfo &tipInfo = iEnrFront.giveTipInfo();
SpatialLocalizer *localizer = iDomain.giveSpatialLocalizer();
// It is meaningless to propagate a tip that is not inside any element
if ( tipInfo.mGlobalCoord.giveSize() == 0 ) {
return false;
}
Element *el = localizer->giveElementContainingPoint(tipInfo.mGlobalCoord);
if ( el == NULL ) {
return false;
}
double angleRad = mAngle * M_PI / 180.0;
FloatArray dir = {
cos(angleRad), sin(angleRad)
};
oTipProp.mTipIndex = tipInfo.mTipIndex;
oTipProp.mPropagationDir = dir;
oTipProp.mPropagationLength = mIncrementLength;
return true;
}
void
MMALeastSquareProjection :: __init(Domain *dold, IntArray &type, FloatArray &coords, Set &elemSet, TimeStep *tStep, bool iCohesiveZoneGP)
//(Domain* dold, IntArray& varTypes, GaussPoint* gp, TimeStep* tStep)
{
GaussPoint *sourceIp;
Element *sourceElement;
SpatialLocalizer *sl = dold->giveSpatialLocalizer();
IntegrationRule *iRule;
IntArray patchList;
this->patchDomain = dold;
// find the closest IP on old mesh
sourceElement = sl->giveElementContainingPoint(coords, elemSet);
if ( !sourceElement ) {
OOFEM_ERROR("no suitable source element found");
}
// determine the type of patch
Element_Geometry_Type egt = sourceElement->giveGeometryType();
if ( egt == EGT_line_1 ) {
this->patchType = MMALSPPatchType_1dq;
} else if ( ( egt == EGT_triangle_1 ) || ( egt == EGT_quad_1 ) ) {
this->patchType = MMALSPPatchType_2dq;
} else {
OOFEM_ERROR("unsupported material mode");
}
/* Determine the state of closest point.
* Only IP in the neighbourhood with same state can be used
* to interpolate the values.
*/
FloatArray dam;
int state = 0;
if ( this->stateFilter ) {
iRule = sourceElement->giveDefaultIntegrationRulePtr();
for ( GaussPoint *gp: *iRule ) {
sourceElement->giveIPValue(dam, gp, IST_PrincipalDamageTensor, tStep);
if ( dam.computeNorm() > 1.e-3 ) {
state = 1; // damaged
}
}
}
// from source neighbours the patch will be constructed
Element *element;
IntArray neighborList;
patchList.resize(1);
patchList.at(1) = sourceElement->giveNumber();
int minNumberOfPoints = this->giveNumberOfUnknownPolynomialCoefficients(this->patchType);
int actualNumberOfPoints = sourceElement->giveDefaultIntegrationRulePtr()->giveNumberOfIntegrationPoints();
int nite = 0;
int elemFlag;
// check if number of IP in patchList is sufficient
// some recursion control would be appropriate
while ( ( actualNumberOfPoints < minNumberOfPoints ) && ( nite <= 2 ) ) {
//if not, construct the neighborhood
dold->giveConnectivityTable()->giveElementNeighbourList(neighborList, patchList);
// count number of available points
patchList.clear();
actualNumberOfPoints = 0;
for ( int i = 1; i <= neighborList.giveSize(); i++ ) {
if ( this->stateFilter ) {
element = patchDomain->giveElement( neighborList.at(i) );
// exclude elements in different regions
if ( !elemSet.hasElement( element->giveNumber() ) ) {
continue;
}
iRule = element->giveDefaultIntegrationRulePtr();
elemFlag = 0;
for ( GaussPoint *gp: *iRule ) {
element->giveIPValue(dam, gp, IST_PrincipalDamageTensor, tStep);
if ( state && ( dam.computeNorm() > 1.e-3 ) ) {
actualNumberOfPoints++;
elemFlag = 1;
} else if ( ( state == 0 ) && ( dam.computeNorm() < 1.e-3 ) ) {
actualNumberOfPoints++;
elemFlag = 1;
}
}
if ( elemFlag ) {
// include this element with corresponding state in neighbor search.
patchList.followedBy(neighborList.at(i), 10);
}
} else { // if (! yhis->stateFilter)
element = patchDomain->giveElement( neighborList.at(i) );
// exclude elements in different regions
if ( !elemSet.hasElement( element->giveNumber() ) ) {
continue;
}
actualNumberOfPoints += element->giveDefaultIntegrationRulePtr()->giveNumberOfIntegrationPoints();
patchList.followedBy(neighborList.at(i), 10);
}
} // end loop over neighbor list
nite++;
}
if ( nite > 2 ) {
// not enough points -> take closest point projection
patchGPList.clear();
sourceIp = sl->giveClosestIP(coords, elemSet);
patchGPList.push_front(sourceIp);
//fprintf(stderr, "MMALeastSquareProjection: too many neighbor search iterations\n");
//exit (1);
return;
}
#ifdef MMALSP_ONLY_CLOSEST_POINTS
// select only the nval closest IP points
GaussPoint **gpList = ( GaussPoint ** ) malloc(sizeof( GaussPoint * ) * actualNumberOfPoints);
FloatArray dist(actualNumberOfPoints), srcgpcoords;
int npoints = 0;
// check allocation of gpList
if ( gpList == NULL ) {
OOFEM_FATAL("memory allocation error");
}
for ( int ielem = 1; ielem <= patchList.giveSize(); ielem++ ) {
element = patchDomain->giveElement( patchList.at(ielem) );
iRule = element->giveDefaultIntegrationRulePtr();
for ( GaussPoint *srcgp: *iRule ) {
if ( element->computeGlobalCoordinates( srcgpcoords, * ( srcgp->giveNaturalCoordinates() ) ) ) {
element->giveIPValue(dam, srcgp, IST_PrincipalDamageTensor, tStep);
if ( this->stateFilter ) {
// consider only points with same state
if ( ( ( state == 1 ) && ( norm(dam) > 1.e-3 ) ) || ( ( ( state == 0 ) && norm(dam) < 1.e-3 ) ) ) {
npoints++;
dist.at(npoints) = coords.distance(srcgpcoords);
gpList [ npoints - 1 ] = srcgp;
}
} else {
// take all points into account
npoints++;
dist.at(npoints) = coords.distance(srcgpcoords);
gpList [ npoints - 1 ] = srcgp;
}
} else {
OOFEM_ERROR("computeGlobalCoordinates failed");
}
}
}
if ( npoints != actualNumberOfPoints ) {
OOFEM_ERROR("internal error");
}
//minNumberOfPoints = min (actualNumberOfPoints, minNumberOfPoints+2);
patchGPList.clear();
// now find the minNumberOfPoints with smallest distance
// from point of interest
double swap, minDist;
int minDistIndx = 0;
// loop over all points
for ( int i = 1; i <= minNumberOfPoints; i++ ) {
minDist = dist.at(i);
minDistIndx = i;
// search for point with i-th smallest distance
for ( j = i + 1; j <= actualNumberOfPoints; j++ ) {
if ( dist.at(j) < minDist ) {
minDist = dist.at(j);
minDistIndx = j;
}
}
// remember this ip
patchGPList.push_front(gpList [ minDistIndx - 1 ]);
swap = dist.at(i);
dist.at(i) = dist.at(minDistIndx);
dist.at(minDistIndx) = swap;
srcgp = gpList [ i - 1 ];
gpList [ i - 1 ] = gpList [ minDistIndx - 1 ];
gpList [ minDistIndx - 1 ] = srcgp;
}
if ( patchGPList.size() != minNumberOfPoints ) {
OOFEM_ERROR("internal error 2");
exit(1);
}
free(gpList);
#else
// take all neighbors
patchGPList.clear();
for ( int ielem = 1; ielem <= patchList.giveSize(); ielem++ ) {
element = patchDomain->giveElement( patchList.at(ielem) );
iRule = element->giveDefaultIntegrationRulePtr();
for ( GaussPoint *gp: *iRule ) {
patchGPList.push_front( gp );
}
}
#endif
}
void
POIExportModule :: exportPrimVarAs(UnknownType valID, FILE *stream, TimeStep *tStep)
{
Domain *d = emodel->giveDomain(1);
int j;
FloatArray pv, coords(3);
InternalStateValueType type = ISVT_UNDEFINED;
if ( valID == DisplacementVector ) {
type = ISVT_VECTOR;
} else if ( valID == FluxVector ) {
type = ISVT_SCALAR;
} else {
OOFEM_ERROR("POIExportModule::exportPrimVarAs: unsupported UnknownType");
}
// print header
if ( type == ISVT_SCALAR ) {
fprintf(stream, "SCALARS prim_scalar_%d\n", ( int ) valID);
} else if ( type == ISVT_VECTOR ) {
fprintf(stream, "VECTORS vector_%d float\n", ( int ) valID);
} else {
fprintf(stderr, "POIExportModule::exportPrimVarAs: unsupported variable type\n");
}
SpatialLocalizer *sl = d->giveSpatialLocalizer();
// loop over POIs
std::list< POI_dataType > :: iterator PoiIter;
for ( PoiIter = POIList.begin(); PoiIter != POIList.end(); ++PoiIter ) {
coords.at(1) = ( * PoiIter ).x;
coords.at(2) = ( * PoiIter ).y;
coords.at(3) = ( * PoiIter ).z;
//region = (*PoiIter).region;
Element *source = sl->giveElementContainingPoint(coords, NULL);
if ( source ) {
// ask interface
EIPrimaryUnknownMapperInterface *interface =
( EIPrimaryUnknownMapperInterface * ) ( source->giveInterface(EIPrimaryUnknownMapperInterfaceType) );
if ( interface ) {
interface->EIPrimaryUnknownMI_computePrimaryUnknownVectorAt(VM_Total, tStep, coords, pv);
} else {
pv.resize(0);
OOFEM_WARNING2( "POIExportModule::exportPrimVarAs: element %d with no EIPrimaryUnknownMapperInterface support",
source->giveNumber() );
}
fprintf(stream, "%10d ", ( * PoiIter ).id);
if ( pv.giveSize() ) {
for ( j = 1; j <= pv.giveSize(); j++ ) {
fprintf( stream, " %15e ", pv.at(j) );
}
}
fprintf(stream, "\n");
} else {
OOFEM_ERROR4( "POIExportModule::exportPrimVarAs: no element containing POI(%e,%e,%e) found",
coords.at(1), coords.at(2), coords.at(3) );
}
}
}
void PLHoopStressCirc :: propagateInterfaces(Domain &iDomain, EnrichmentDomain &ioEnrDom)
{
// Fetch crack tip data
TipInfo tipInfoStart, tipInfoEnd;
ioEnrDom.giveTipInfos(tipInfoStart, tipInfoEnd);
std :: vector< TipInfo >tipInfo = {tipInfoStart, tipInfoEnd};
SpatialLocalizer *localizer = iDomain.giveSpatialLocalizer();
for ( size_t tipIndex = 0; tipIndex < tipInfo.size(); tipIndex++ ) {
// Construct circle points on an arc from -90 to 90 degrees
double angle = -90.0 + mAngleInc;
std :: vector< double >angles;
while ( angle <= ( 90.0 - mAngleInc ) ) {
angles.push_back(angle * M_PI / 180.0);
angle += mAngleInc;
}
const FloatArray &xT = tipInfo [ tipIndex ].mGlobalCoord;
const FloatArray &t = tipInfo [ tipIndex ].mTangDir;
const FloatArray &n = tipInfo [ tipIndex ].mNormalDir;
// It is meaningless to propagate a tip that is not inside any element
Element *el = localizer->giveElementContainingPoint(tipInfo [ tipIndex ].mGlobalCoord);
if ( el != NULL ) {
std :: vector< FloatArray >circPoints;
for ( size_t i = 0; i < angles.size(); i++ ) {
FloatArray tangent(2);
tangent.zero();
tangent.add(cos(angles [ i ]), t);
tangent.add(sin(angles [ i ]), n);
tangent.normalize();
FloatArray x(xT);
x.add(mRadius, tangent);
circPoints.push_back(x);
}
std :: vector< double >sigTTArray, sigRTArray;
// Loop over circle points
for ( size_t pointIndex = 0; pointIndex < circPoints.size(); pointIndex++ ) {
FloatArray stressVec;
if ( mUseRadialBasisFunc ) {
// Interpolate stress with radial basis functions
// Choose a cut-off length l:
// take the distance between two nodes in the element containing the
// crack tip multiplied by a constant factor.
// ( This choice implies that we hope that the element has reasonable
// aspect ratio.)
const FloatArray &x1 = * ( el->giveDofManager(1)->giveCoordinates() );
const FloatArray &x2 = * ( el->giveDofManager(2)->giveCoordinates() );
const double l = 1.0 * x1.distance(x2);
// Use the octree to get all elements that have
// at least one Gauss point in a certain region around the tip.
const double searchRadius = 3.0 * l;
std :: set< int >elIndices;
localizer->giveAllElementsWithIpWithinBox(elIndices, circPoints [ pointIndex ], searchRadius);
// Loop over the elements and Gauss points obtained.
// Evaluate the interpolation.
FloatArray sumQiWiVi;
double sumWiVi = 0.0;
for ( int elIndex: elIndices ) {
Element *gpEl = iDomain.giveElement(elIndex);
IntegrationRule *iRule = gpEl->giveDefaultIntegrationRulePtr();
for ( GaussPoint *gp_i: *iRule ) {
////////////////////////////////////////
// Compute global gp coordinates
FloatArray N;
FEInterpolation *interp = gpEl->giveInterpolation();
interp->evalN( N, * ( gp_i->giveCoordinates() ), FEIElementGeometryWrapper(gpEl) );
// Compute global coordinates of Gauss point
FloatArray globalCoord(2);
globalCoord.zero();
for ( int i = 1; i <= gpEl->giveNumberOfDofManagers(); i++ ) {
DofManager *dMan = gpEl->giveDofManager(i);
globalCoord.at(1) += N.at(i) * dMan->giveCoordinate(1);
globalCoord.at(2) += N.at(i) * dMan->giveCoordinate(2);
}
////////////////////////////////////////
// Compute weight of kernel function
FloatArray tipToGP;
tipToGP.beDifferenceOf(globalCoord, xT);
bool inFrontOfCrack = true;
if ( tipToGP.dotProduct(t) < 0.0 ) {
inFrontOfCrack = false;
}
double r = circPoints [ pointIndex ].distance(globalCoord);
if ( r < l && inFrontOfCrack ) {
double w = ( ( l - r ) / ( pow(2.0 * M_PI, 1.5) * pow(l, 3) ) ) * exp( -0.5 * pow(r, 2) / pow(l, 2) );
// Compute gp volume
double V = gpEl->computeVolumeAround(gp_i);
// Get stress
StructuralMaterialStatus *ms = dynamic_cast< StructuralMaterialStatus * >( gp_i->giveMaterialStatus() );
if ( ms == NULL ) {
OOFEM_ERROR("failed to fetch MaterialStatus.");
}
FloatArray stressVecGP = ms->giveStressVector();
if ( sumQiWiVi.giveSize() != stressVecGP.giveSize() ) {
sumQiWiVi.resize( stressVecGP.giveSize() );
sumQiWiVi.zero();
}
// Add to numerator
sumQiWiVi.add(w * V, stressVecGP);
// Add to denominator
sumWiVi += w * V;
}
}
}
if ( fabs(sumWiVi) > 1.0e-12 ) {
stressVec.beScaled(1.0 / sumWiVi, sumQiWiVi);
} else {
// Take stress from closest Gauss point
int region = 1;
bool useCZGP = false;
GaussPoint &gp = * ( localizer->giveClosestIP(circPoints [ pointIndex ], region, useCZGP) );
// Compute stresses
StructuralMaterialStatus *ms = dynamic_cast< StructuralMaterialStatus * >( gp.giveMaterialStatus() );
if ( ms == NULL ) {
OOFEM_ERROR("failed to fetch MaterialStatus.");
}
stressVec = ms->giveStressVector();
}
} else {
// Take stress from closest Gauss point
int region = 1;
bool useCZGP = false;
GaussPoint &gp = * ( localizer->giveClosestIP(circPoints [ pointIndex ], region, useCZGP) );
// Compute stresses
StructuralMaterialStatus *ms = dynamic_cast< StructuralMaterialStatus * >( gp.giveMaterialStatus() );
if ( ms == NULL ) {
OOFEM_ERROR("failed to fetch MaterialStatus.");
}
stressVec = ms->giveStressVector();
}
FloatMatrix stress(2, 2);
int shearPos = stressVec.giveSize();
stress.at(1, 1) = stressVec.at(1);
stress.at(1, 2) = stressVec.at(shearPos);
stress.at(2, 1) = stressVec.at(shearPos);
stress.at(2, 2) = stressVec.at(2);
// Rotation matrix
FloatMatrix rot(2, 2);
rot.at(1, 1) = cos(angles [ pointIndex ]);
rot.at(1, 2) = -sin(angles [ pointIndex ]);
rot.at(2, 1) = sin(angles [ pointIndex ]);
rot.at(2, 2) = cos(angles [ pointIndex ]);
FloatArray tRot, nRot;
tRot.beProductOf(rot, t);
nRot.beProductOf(rot, n);
FloatMatrix rotTot(2, 2);
rotTot.setColumn(tRot, 1);
rotTot.setColumn(nRot, 2);
FloatMatrix tmp, stressRot;
tmp.beTProductOf(rotTot, stress);
stressRot.beProductOf(tmp, rotTot);
const double sigThetaTheta = stressRot.at(2, 2);
sigTTArray.push_back(sigThetaTheta);
const double sigRTheta = stressRot.at(1, 2);
sigRTArray.push_back(sigRTheta);
}
//////////////////////////////
// Compute propagation angle
// Find angles that fulfill sigRT = 0
const double stressTol = 1.0e-9;
double maxSigTT = 0.0, maxAngle = 0.0;
bool foundZeroLevel = false;
for ( size_t segIndex = 0; segIndex < ( circPoints.size() - 1 ); segIndex++ ) {
// If the shear stress sigRT changes sign over the segment
if ( sigRTArray [ segIndex ] * sigRTArray [ segIndex + 1 ] < stressTol ) {
// Compute location of zero level
double xi = EnrichmentItem :: calcXiZeroLevel(sigRTArray [ segIndex ], sigRTArray [ segIndex + 1 ]);
double theta = 0.5 * ( 1.0 - xi ) * angles [ segIndex ] + 0.5 * ( 1.0 + xi ) * angles [ segIndex + 1 ];
double sigThetaTheta = 0.5 * ( 1.0 - xi ) * sigTTArray [ segIndex ] + 0.5 * ( 1.0 + xi ) * sigTTArray [ segIndex + 1 ];
// printf("Found candidate: theta: %e sigThetaTheta: %e\n", theta, sigThetaTheta);
if ( sigThetaTheta > maxSigTT ) {
foundZeroLevel = true;
maxSigTT = sigThetaTheta;
maxAngle = theta;
}
}
}
if ( !foundZeroLevel ) {
printf("No zero level was found.\n");
}
if ( iDomain.giveXfemManager()->giveVtkDebug() ) {
XFEMDebugTools :: WriteArrayToMatlab("sigTTvsAngle.m", angles, sigTTArray);
XFEMDebugTools :: WriteArrayToMatlab("sigRTvsAngle.m", angles, sigRTArray);
XFEMDebugTools :: WriteArrayToGnuplot("sigTTvsAngle.dat", angles, sigTTArray);
XFEMDebugTools :: WriteArrayToGnuplot("sigRTvsAngle.dat", angles, sigRTArray);
}
// Compare with threshold
if ( maxSigTT > mHoopStressThreshold && foundZeroLevel ) {
// Rotation matrix
FloatMatrix rot(2, 2);
rot.at(1, 1) = cos(maxAngle);
rot.at(1, 2) = -sin(maxAngle);
rot.at(2, 1) = sin(maxAngle);
rot.at(2, 2) = cos(maxAngle);
FloatArray dir;
dir.beProductOf(rot, tipInfo [ tipIndex ].mTangDir);
// Fill up struct
std :: vector< TipPropagation >tipPropagations;
TipPropagation tipProp;
tipProp.mTipIndex = tipIndex;
tipProp.mPropagationDir = dir;
tipProp.mPropagationLength = mIncrementLength;
tipPropagations.push_back(tipProp);
// Propagate
ioEnrDom.propagateTips(tipPropagations);
}
}
}
}
int
EIPrimaryUnknownMapper :: evaluateAt(FloatArray &answer, IntArray &dofMask, ValueModeType mode,
Domain *oldd, FloatArray &coords, IntArray ®List, TimeStep *tStep)
{
Element *oelem;
EIPrimaryUnknownMapperInterface *interface;
SpatialLocalizer *sl = oldd->giveSpatialLocalizer();
///@todo Change to the other version after checking that it works properly. Will render "giveElementCloseToPoint" obsolete (superseeded by giveElementClosestToPoint).
#if 1
if ( regList.isEmpty() ) {
oelem = sl->giveElementContainingPoint(coords);
} else {
oelem = sl->giveElementContainingPoint(coords, & regList);
}
if ( !oelem ) {
if ( regList.isEmpty() ) {
oelem = oldd->giveSpatialLocalizer()->giveElementCloseToPoint(coords);
} else {
oelem = oldd->giveSpatialLocalizer()->giveElementCloseToPoint(coords, & regList);
}
if ( !oelem ) {
OOFEM_WARNING("Couldn't find any element containing point.");
return false;
}
}
#else
FloatArray lcoords, closest;
if ( regList.isEmpty() ) {
oelem = sl->giveElementClosestToPoint(lcoords, closest, coords, 0);
} else {
// Take the minimum of any region
double mindist = 0.0, distance;
oelem = NULL;
for ( int i = 1; i < regList.giveSize(); ++i ) {
Element *tmpelem = sl->giveElementClosestToPoint( lcoords, closest, coords, regList.at(i) );
distance = closest.distance_square(coords);
if ( tmpelem != NULL ) {
distance = closest.distance_square(coords);
if ( distance < mindist || i == 1 ) {
mindist = distance;
oelem = tmpelem;
if ( distance == 0.0 ) {
break;
}
}
}
}
}
if ( !oelem ) {
OOFEM_WARNING("Couldn't find any element containing point.");
return false;
}
#endif
interface = static_cast< EIPrimaryUnknownMapperInterface * >( oelem->giveInterface(EIPrimaryUnknownMapperInterfaceType) );
if ( interface ) {
oelem->giveElementDofIDMask(dofMask);
#if 1
FloatArray lcoords;
if ( oelem->computeLocalCoordinates(lcoords, coords) ) {
interface->EIPrimaryUnknownMI_computePrimaryUnknownVectorAtLocal(mode, tStep, lcoords, answer);
} else {
answer.clear();
}
#else
interface->EIPrimaryUnknownMI_computePrimaryUnknownVectorAtLocal(mode, tStep, lcoords, answer);
#endif
} else {
OOFEM_ERROR("Element does not support EIPrimaryUnknownMapperInterface");
}
return true;
}
std::vector<std::unique_ptr<EnrichmentItem>> NCPrincipalStress::nucleateEnrichmentItems() {
SpatialLocalizer *octree = this->mpDomain->giveSpatialLocalizer();
XfemManager *xMan = mpDomain->giveXfemManager();
std::vector<std::unique_ptr<EnrichmentItem>> eiList;
// Center coordinates of newly inserted cracks
std::vector<FloatArray> center_coord_inserted_cracks;
// Loop over all elements and all bulk GP.
for(auto &el : mpDomain->giveElements() ) {
int numIR = el->giveNumberOfIntegrationRules();
int csNum = el->giveCrossSection()->giveNumber();
if(csNum == mCrossSectionInd || true) {
for(int irInd = 0; irInd < numIR; irInd++) {
IntegrationRule *ir = el->giveIntegrationRule(irInd);
int numGP = ir->giveNumberOfIntegrationPoints();
for(int gpInd = 0; gpInd < numGP; gpInd++) {
GaussPoint *gp = ir->getIntegrationPoint(gpInd);
// int csNum = gp->giveCrossSection()->giveNumber();
// printf("csNum: %d\n", csNum);
StructuralMaterialStatus *ms = dynamic_cast<StructuralMaterialStatus*>(gp->giveMaterialStatus());
if(ms != NULL) {
const FloatArray &stress = ms->giveTempStressVector();
FloatArray principalVals;
FloatMatrix principalDirs;
StructuralMaterial::computePrincipalValDir(principalVals, principalDirs, stress, principal_stress);
if(principalVals[0] > mStressThreshold) {
// printf("\nFound GP with stress above threshold.\n");
// printf("principalVals: "); principalVals.printYourself();
FloatArray crackNormal;
crackNormal.beColumnOf(principalDirs, 1);
// printf("crackNormal: "); crackNormal.printYourself();
FloatArray crackTangent = {-crackNormal(1), crackNormal(0)};
crackTangent.normalize();
// printf("crackTangent: "); crackTangent.printYourself();
// Create geometry
FloatArray pc = {gp->giveGlobalCoordinates()(0), gp->giveGlobalCoordinates()(1)};
// printf("Global coord: "); pc.printYourself();
FloatArray ps = pc;
ps.add(-0.5*mInitialCrackLength, crackTangent);
FloatArray pe = pc;
pe.add(0.5*mInitialCrackLength, crackTangent);
if(mCutOneEl) {
// If desired, ensure that the crack cuts exactly one element.
Line line(ps, pe);
std::vector<FloatArray> intersecPoints;
// line.computeIntersectionPoints(el.get(), intersecPoints);
for ( int i = 1; i <= el->giveNumberOfDofManagers(); i++ ) {
// int n1 = i;
// int n2 = 0;
// if ( i < el->giveNumberOfDofManagers() ) {
// n2 = i + 1;
// } else {
// n2 = 1;
// }
// const FloatArray &p1 = *(el->giveDofManager(n1)->giveCoordinates());
// const FloatArray &p2 = *(el->giveDofManager(n2)->giveCoordinates());
}
// printf("intersecPoints.size(): %lu\n", intersecPoints.size());
if(intersecPoints.size() == 2) {
ps = std::move(intersecPoints[0]);
pe = std::move(intersecPoints[1]);
}
else {
OOFEM_ERROR("intersecPoints.size() != 2")
}
}
FloatArray points = {ps(0), ps(1), pc(0), pc(1), pe(0), pe(1)};
// double diffX = 0.5*(ps(0) + pe(0)) - pc(0);
// printf("diffX: %e\n", diffX);
// double diffY = 0.5*(ps(1) + pe(1)) - pc(1);
// printf("diffY: %e\n", diffY);
// TODO: Check if nucleation is allowed, by checking for already existing cracks close to the GP.
// Idea: Nucleation is not allowed if we are within an enriched element. In this way, branching is not
// completely prohibited, but we avoid initiating multiple similar cracks.
bool insertionAllowed = true;
Element *el_s = octree->giveElementContainingPoint(ps);
if(el_s) {
if( xMan->isElementEnriched(el_s) ) {
insertionAllowed = false;
}
}
Element *el_c = octree->giveElementContainingPoint(pc);
if(el_c) {
if( xMan->isElementEnriched(el_c) ) {
insertionAllowed = false;
}
}
Element *el_e = octree->giveElementContainingPoint(pe);
if(el_e) {
if( xMan->isElementEnriched(el_e) ) {
insertionAllowed = false;
}
}
for(const auto &x: center_coord_inserted_cracks) {
if( x.distance(pc) < 2.0*mInitialCrackLength) {
insertionAllowed = false;
break;
printf("Preventing insertion.\n");
}
}
if(insertionAllowed) {
int n = xMan->giveNumberOfEnrichmentItems() + 1;
std::unique_ptr<Crack> crack = std::make_unique<Crack>(n, xMan, mpDomain);
// Geometry
std::unique_ptr<BasicGeometry> geom = std::make_unique<PolygonLine>();
geom->insertVertexBack(ps);
geom->insertVertexBack(pc);
geom->insertVertexBack(pe);
crack->setGeometry(std::move(geom));
// Enrichment function
EnrichmentFunction *ef = new HeavisideFunction(1, mpDomain);
crack->setEnrichmentFunction(ef);
// Enrichment fronts
// EnrichmentFront *efStart = new EnrFrontLinearBranchFuncOneEl();
EnrichmentFront *efStart = new EnrFrontCohesiveBranchFuncOneEl();
crack->setEnrichmentFrontStart(efStart);
// EnrichmentFront *efEnd = new EnrFrontLinearBranchFuncOneEl();
EnrichmentFront *efEnd = new EnrFrontCohesiveBranchFuncOneEl();
crack->setEnrichmentFrontEnd(efEnd);
///////////////////////////////////////
// Propagation law
// Options
// double radius = 0.5*mInitialCrackLength, angleInc = 10.0, incrementLength = 0.5*mInitialCrackLength, hoopStressThreshold = 0.0;
// bool useRadialBasisFunc = true;
// PLHoopStressCirc *pl = new PLHoopStressCirc();
// pl->setRadius(radius);
// pl->setAngleInc(angleInc);
// pl->setIncrementLength(incrementLength);
// pl->setHoopStressThreshold(hoopStressThreshold);
// pl->setUseRadialBasisFunc(useRadialBasisFunc);
// PLDoNothing *pl = new PLDoNothing();
PLMaterialForce *pl = new PLMaterialForce();
pl->setRadius(mMatForceRadius);
pl->setIncrementLength(mIncrementLength);
// pl->setIncrementLength(0.25);
// pl->setCrackPropThreshold(0.25);
pl->setCrackPropThreshold(mCrackPropThreshold);
crack->setPropagationLaw(pl);
crack->updateDofIdPool();
center_coord_inserted_cracks.push_back(pc);
eiList.push_back( std::unique_ptr<EnrichmentItem>(std::move(crack)) );
// printf("Nucleating a crack in NCPrincipalStress::nucleateEnrichmentItems.\n");
// printf("el->giveGlobalNumber(): %d\n", el->giveGlobalNumber() );
// We only introduce one crack per element in a single time step.
break;
}
}
}
}
}
} // If correct csNum
}