void
PeridigmNS::InterfaceAwareDamageModel::initialize(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
double *damage, *bondDamage, *criticalStretch;
dataManager.getData(m_damageFieldId, PeridigmField::STEP_NP1)->ExtractView(&damage);
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1)->ExtractView(&bondDamage);
dataManager.getData(m_criticalStretchFieldId, PeridigmField::STEP_NONE)->ExtractView(&criticalStretch);
// int totalListSize = numOwnedPoints;
// Initialize damage to zero
int neighborhoodListIndex = 0;
int bondIndex = 0;
for(int iID=0 ; iID<numOwnedPoints ; ++iID){
int nodeID = ownedIDs[iID];
damage[nodeID] = 0.0;
criticalStretch[nodeID] = m_criticalStretch;
int numNeighbors = neighborhoodList[neighborhoodListIndex++];
// totalListSize += numNeighbors;
neighborhoodListIndex += numNeighbors;
for(int iNID=0 ; iNID<numNeighbors ; ++iNID){
bondDamage[bondIndex++] = 0.0;
}
}
}
void PeridigmNS::ElasticPlasticMaterial::initialize(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager)
{
// Extract pointers to the underlying data
double *xOverlap, *cellVolumeOverlap, *weightedVolume;
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&xOverlap);
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&cellVolumeOverlap);
dataManager.getData(m_weightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&weightedVolume);
MATERIAL_EVALUATION::computeWeightedVolume(xOverlap,cellVolumeOverlap,weightedVolume,numOwnedPoints,neighborhoodList,m_horizon);
}
void
PeridigmNS::LCMMaterial::computeForce(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
// Zero out the forces
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->PutScalar(0.0);
}
void
PeridigmNS::ElasticPlasticMaterial::computeAutomaticDifferentiationJacobian(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager,
PeridigmNS::SerialMatrix& jacobian,
PeridigmNS::Material::JacobianType jacobianType) const
{
// Compute contributions to the tangent matrix on an element-by-element basis
// To reduce memory re-allocation, use static variable to store Fad types for
// current coordinates (independent variables).
static vector<Sacado::Fad::DFad<double> > y_AD;
// Loop over all points.
int neighborhoodListIndex = 0;
for(int iID=0 ; iID<numOwnedPoints ; ++iID){
// Create a temporary neighborhood consisting of a single point and its neighbors.
int numNeighbors = neighborhoodList[neighborhoodListIndex++];
int numEntries = numNeighbors+1;
int numDof = 3*numEntries;
vector<int> tempMyGlobalIDs(numEntries);
// Put the node at the center of the neighborhood at the beginning of the list.
tempMyGlobalIDs[0] = dataManager.getOwnedScalarPointMap()->GID(iID);
vector<int> tempNeighborhoodList(numEntries);
tempNeighborhoodList[0] = numNeighbors;
for(int iNID=0 ; iNID<numNeighbors ; ++iNID){
int neighborID = neighborhoodList[neighborhoodListIndex++];
tempMyGlobalIDs[iNID+1] = dataManager.getOverlapScalarPointMap()->GID(neighborID);
tempNeighborhoodList[iNID+1] = iNID+1;
}
Epetra_SerialComm serialComm;
Teuchos::RCP<Epetra_BlockMap> tempOneDimensionalMap = Teuchos::rcp(new Epetra_BlockMap(numEntries, numEntries, &tempMyGlobalIDs[0], 1, 0, serialComm));
Teuchos::RCP<Epetra_BlockMap> tempThreeDimensionalMap = Teuchos::rcp(new Epetra_BlockMap(numEntries, numEntries, &tempMyGlobalIDs[0], 3, 0, serialComm));
Teuchos::RCP<Epetra_BlockMap> tempBondMap = Teuchos::rcp(new Epetra_BlockMap(1, 1, &tempMyGlobalIDs[0], numNeighbors, 0, serialComm));
// Create a temporary DataManager containing data for this point and its neighborhood.
PeridigmNS::DataManager tempDataManager;
tempDataManager.setMaps(Teuchos::RCP<const Epetra_BlockMap>(),
tempOneDimensionalMap,
Teuchos::RCP<const Epetra_BlockMap>(),
tempThreeDimensionalMap,
tempBondMap);
// The temporary data manager will have the same fields and data as the real data manager.
vector<int> fieldIds = dataManager.getFieldIds();
tempDataManager.allocateData(fieldIds);
tempDataManager.copyLocallyOwnedDataFromDataManager(dataManager);
// Set up numOwnedPoints and ownedIDs.
// There is only one owned ID, and it has local ID zero in the tempDataManager.
int tempNumOwnedPoints = 1;
vector<int> tempOwnedIDs(tempNumOwnedPoints);
tempOwnedIDs[0] = 0;
// Use the scratchMatrix as sub-matrix for storing tangent values prior to loading them into the global tangent matrix.
// Resize scratchMatrix if necessary
if(scratchMatrix.Dimension() < numDof)
scratchMatrix.Resize(numDof);
// Create a list of global indices for the rows/columns in the scratch matrix.
vector<int> globalIndices(numDof);
for(int i=0 ; i<numEntries ; ++i){
int globalID = tempOneDimensionalMap->GID(i);
for(int j=0 ; j<3 ; ++j)
globalIndices[3*i+j] = 3*globalID+j;
}
// Extract pointers to the underlying data in the constitutiveData array.
double *x, *y, *cellVolume, *weightedVolume, *damage, *bondDamage, *edpN, *lambdaN;
tempDataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
tempDataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
tempDataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&cellVolume);
tempDataManager.getData(m_weightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&weightedVolume);
tempDataManager.getData(m_damageFieldId, PeridigmField::STEP_NP1)->ExtractView(&damage);
tempDataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1)->ExtractView(&bondDamage);
tempDataManager.getData(m_deviatoricPlasticExtensionFieldId, PeridigmField::STEP_N)->ExtractView(&edpN);
tempDataManager.getData(m_lambdaFieldId, PeridigmField::STEP_N)->ExtractView(&lambdaN);
// Create arrays of Fad objects for the current coordinates, dilatation, and force density
// Modify the existing vector of Fad objects for the current coordinates
if((int)y_AD.size() < numDof)
y_AD.resize(numDof);
for(int i=0 ; i<numDof ; ++i){
y_AD[i].diff(i, numDof);
y_AD[i].val() = y[i];
}
// Create vectors of empty AD types for the dependent variables
vector<Sacado::Fad::DFad<double> > dilatation_AD(numEntries);
vector<Sacado::Fad::DFad<double> > lambdaNP1_AD(numEntries);
int numBonds = tempDataManager.getData(m_deviatoricPlasticExtensionFieldId, PeridigmField::STEP_N)->MyLength();
vector<Sacado::Fad::DFad<double> > edpNP1(numBonds);
vector<Sacado::Fad::DFad<double> > force_AD(numDof);
// Evaluate the constitutive model using the AD types
MATERIAL_EVALUATION::computeDilatation(x,&y_AD[0],weightedVolume,cellVolume,bondDamage,&dilatation_AD[0],&tempNeighborhoodList[0],tempNumOwnedPoints,m_horizon);
MATERIAL_EVALUATION::computeInternalForceIsotropicElasticPlastic
(
x,
&y_AD[0],
weightedVolume,
cellVolume,
&dilatation_AD[0],
bondDamage,
edpN,
&edpNP1[0],
lambdaN,
&lambdaNP1_AD[0],
&force_AD[0],
&tempNeighborhoodList[0],
tempNumOwnedPoints,
m_bulkModulus,
m_shearModulus,
m_horizon,
m_yieldStress,
m_isPlanarProblem,
m_thickness);
// Load derivative values into scratch matrix
// Multiply by volume along the way to convert force density to force
for(int row=0 ; row<numDof ; ++row){
for(int col=0 ; col<numDof ; ++col){
scratchMatrix(row, col) = force_AD[row].dx(col) * cellVolume[row/3];
}
}
// Sum the values into the global tangent matrix (this is expensive).
jacobian.addValues((int)globalIndices.size(), &globalIndices[0], scratchMatrix.Data());
}
}
void
PeridigmNS::ElasticPlasticMaterial::computeForce(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
double *x, *y, *volume, *dilatation, *weightedVolume, *bondDamage, *edpN, *edpNP1, *lambdaN, *lambdaNP1, *force;
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&volume);
dataManager.getData(m_dilatationFieldId, PeridigmField::STEP_NP1)->ExtractView(&dilatation);
dataManager.getData(m_weightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&weightedVolume);
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1)->ExtractView(&bondDamage);
dataManager.getData(m_deviatoricPlasticExtensionFieldId, PeridigmField::STEP_N)->ExtractView(&edpN);
dataManager.getData(m_deviatoricPlasticExtensionFieldId, PeridigmField::STEP_NP1)->ExtractView(&edpNP1);
dataManager.getData(m_lambdaFieldId, PeridigmField::STEP_N)->ExtractView(&lambdaN);
dataManager.getData(m_lambdaFieldId, PeridigmField::STEP_NP1)->ExtractView(&lambdaNP1);
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->ExtractView(&force);
// Zero out the force
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->PutScalar(0.0);
MATERIAL_EVALUATION::computeDilatation(x,y,weightedVolume,volume,bondDamage,dilatation,neighborhoodList,numOwnedPoints,m_horizon);
MATERIAL_EVALUATION::computeInternalForceIsotropicElasticPlastic
(
x,
y,
weightedVolume,
volume,
dilatation,
bondDamage,
edpN,
edpNP1,
lambdaN,
lambdaNP1,
force,
neighborhoodList,
numOwnedPoints,
m_bulkModulus,
m_shearModulus,
m_horizon,
m_yieldStress,
m_isPlanarProblem,
m_thickness
);
}
void
PeridigmNS::Pals_Model::computeStoredElasticEnergyDensity(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
// namespace PALS
using namespace MATERIAL_EVALUATION::PALS;
double K=m_bulkModulus;
double MU=m_shearModulus;
double horizon=m_horizon;
// This function is intended to be called from a compute class.
// The compute class should have already created the Stored_Elastic_Energy_Density field id.
int storedElasticEnergyDensityFieldId = PeridigmNS::FieldManager::self().getFieldId("Stored_Elastic_Energy_Density");
// Extract pointers to the underlying data
double *xOverlap, *yOverlap, *volumeOverlap;
double *omega_constants, *sigma_constants;
double *dilatation, *energy_density;
vector<const double *> omega_multipliers(num_lagrange_multipliers), sigma_multipliers(num_lagrange_multipliers);
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&xOverlap);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&yOverlap);
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&volumeOverlap);
dataManager.getData(m_dilatationFieldId, PeridigmField::STEP_NP1)->ExtractView(&dilatation);
dataManager.getData(m_dilatationNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&omega_constants);
dataManager.getData(m_deviatoricNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&sigma_constants);
dataManager.getData(storedElasticEnergyDensityFieldId , PeridigmField::STEP_NONE)->ExtractView(&energy_density);
for(int i=0;i<num_lagrange_multipliers;i++){
double *dil, *dev;
dataManager.getData(m_dilatationLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dil);
dataManager.getData(m_deviatoricLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dev);
omega_multipliers[i]=dil;
sigma_multipliers[i]=dev;
}
double bond[3];
const double *xOwned = xOverlap;
const double *yOwned = yOverlap;
const double *oc=omega_constants;
const double *sc=sigma_constants;
const double *theta=dilatation;
const int *neighPtr = neighborhoodList;
double cell_volume;
for(int q=0; q<numOwnedPoints; q++, xOwned+=3, yOwned+=3, oc++, sc++, theta++){
// Collect computed Lagrange multipliers for this point 'q'
double sigma_X[NUM_LAGRANGE_MULTIPLIERS];
for(int i=0;i<NUM_LAGRANGE_MULTIPLIERS;i++){
sigma_X[i]=sigma_multipliers[i][q];
}
int numNeigh = *neighPtr; neighPtr++;
const double *X = xOwned;
const double *Y = yOwned;
double sum=0.0;
for(int n=0;n<numNeigh;n++,neighPtr++){
int localId = *neighPtr;
cell_volume = volumeOverlap[localId];
const double *XP = &xOverlap[3*localId];
const double *YP = &yOverlap[3*localId];
bond[0]=XP[0]-X[0];
bond[1]=XP[1]-X[1];
bond[2]=XP[2]-X[2];
double a = bond[0];
double b = bond[1];
double c = bond[2];
double xi = sqrt(a*a+b*b+c*c);
a = YP[0]-Y[0];
b = YP[1]-Y[1];
c = YP[2]-Y[2];
double dY = sqrt(a*a+b*b+c*c);
double e = dY-xi;
double eps=e-xi*(*theta)/3.0;
pals_influence<deviatoric_influence> SIGMA(m_SIGMA_0,*sc,sigma_X);
double sigma = SIGMA(bond,horizon);
sum += sigma * eps * eps * cell_volume;
}
double d=*theta;
/*
* Deviatoric term does not include factor of 1/2
*/
energy_density[q] = 0.5 * K * d * d + MU * sum;
}
}
void
PeridigmNS::Pals_Model::computeForce(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
// Zero out the forces
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->PutScalar(0.0);
// Extract pointers to the underlying data
double *x, *y, *cellVolume, *pals_pressure, *force, *weightedVolume;
double *omega_constants, *sigma_constants;
double *dilatation;
vector<const double *> omega_multipliers(num_lagrange_multipliers), sigma_multipliers(num_lagrange_multipliers);
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&cellVolume);
dataManager.getData(m_weightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&weightedVolume);
dataManager.getData(m_dilatationFieldId, PeridigmField::STEP_NP1)->ExtractView(&dilatation);
dataManager.getData(m_palsPressureFieldId, PeridigmField::STEP_NP1)->ExtractView(&pals_pressure);
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->ExtractView(&force);
dataManager.getData(m_dilatationNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&omega_constants);
dataManager.getData(m_deviatoricNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&sigma_constants);
for(int i=0;i<num_lagrange_multipliers;i++){
double *dil, *dev;
dataManager.getData(m_dilatationLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dil);
dataManager.getData(m_deviatoricLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dev);
omega_multipliers[i]=dil;
sigma_multipliers[i]=dev;
}
// namespace PALS
using namespace MATERIAL_EVALUATION::PALS;
computeDilatationAndPalsPressure
(
x,
y,
cellVolume,
omega_multipliers,
omega_constants,
sigma_multipliers,
sigma_constants,
weightedVolume,
dilatation,
pals_pressure,
neighborhoodList,
numOwnedPoints,
m_bulkModulus,
m_shearModulus,
m_horizon,
m_OMEGA_0,
m_SIGMA_0
);
computeInternalForcePals
(
x,
y,
cellVolume,
omega_multipliers,
omega_constants,
sigma_multipliers,
sigma_constants,
dilatation,
pals_pressure,
force,
neighborhoodList,
numOwnedPoints,
m_bulkModulus,
m_shearModulus,
m_horizon,
m_OMEGA_0,
m_SIGMA_0
);
}
void
PeridigmNS::Pals_Model::
initialize(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager)
{
// Extract pointers to the underlying data
double *xOverlap, *cellVolumeOverlap, *weightedVolume;
double *omega_constants, *sigma_constants;
double *normalized_weighted_volume;
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&xOverlap);
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&cellVolumeOverlap);
dataManager.getData(m_weightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&weightedVolume);
dataManager.getData(m_normalizedWeightedVolumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&normalized_weighted_volume);
dataManager.getData(m_dilatationNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&omega_constants);
dataManager.getData(m_deviatoricNormalizationFieldId, PeridigmField::STEP_NONE)->ExtractView(&sigma_constants);
// namespace PALS
using namespace MATERIAL_EVALUATION::PALS;
{
vector<double *> omega_multipliers(num_lagrange_multipliers), sigma_multipliers(num_lagrange_multipliers);
for(int i=0;i<num_lagrange_multipliers;i++){
double *dil, *dev;
dataManager.getData(m_dilatationLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dil);
dataManager.getData(m_deviatoricLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dev);
omega_multipliers[i]=dil;
sigma_multipliers[i]=dev;
}
compute_lagrange_multipliers
(
xOverlap,
cellVolumeOverlap,
numOwnedPoints,
neighborhoodList,
m_horizon,
omega_multipliers,
omega_constants,
sigma_multipliers,
sigma_constants,
m_OMEGA_0,
m_SIGMA_0
);
}
{
vector<const double *> sigma_multipliers(num_lagrange_multipliers);
for(int i=0;i<num_lagrange_multipliers;i++){
double *dev;
dataManager.getData(m_deviatoricLagrangeMultiplersFieldIds[i],PeridigmField::STEP_NONE)->ExtractView(&dev);
sigma_multipliers[i]=dev;
}
/*
* DEBUGGING
* Compute normalized weighted volume: all values should be 3.0
computeNormalizedWeightedVolume
(
xOverlap,
cellVolumeOverlap,
omega_constants,
bondDamage,
normalized_weighted_volume,
numOwnedPoints,
neighborhoodList,
m_horizon,
m_SIGMA_0
);
*/
/*
* Weighted volume with influence function $\sigma$ rather than $\omega$
*/
computeWeightedVolume
(
xOverlap,
cellVolumeOverlap,
sigma_multipliers,
sigma_constants,
weightedVolume,
numOwnedPoints,
neighborhoodList,
m_horizon,
m_SIGMA_0
);
}
}
void
PeridigmNS::InterfaceAwareDamageModel::computeDamage(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
double *x, *y, *damage, *bondDamage, *deltaTemperature, *criticalStretch;
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_damageFieldId, PeridigmField::STEP_NP1)->ExtractView(&damage);
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1)->ExtractView(&bondDamage);
dataManager.getData(m_criticalStretchFieldId, PeridigmField::STEP_NONE)->ExtractView(&criticalStretch);
deltaTemperature = NULL;
if(m_applyThermalStrains)
dataManager.getData(m_deltaTemperatureFieldId, PeridigmField::STEP_NP1)->ExtractView(&deltaTemperature);
double trialDamage(0.0);
int neighborhoodListIndex(0), bondIndex(0);
int nodeId, numNeighbors, neighborID, iID, iNID;
double nodeInitialX[3], nodeCurrentX[3], initialDistance, currentDistance, relativeExtension, totalDamage;
// Update the bond damage
// Break bonds if the extension is greater than the critical extension
for(iID=0 ; iID<numOwnedPoints ; ++iID){
nodeId = ownedIDs[iID];
nodeInitialX[0] = x[nodeId*3];
nodeInitialX[1] = x[nodeId*3+1];
nodeInitialX[2] = x[nodeId*3+2];
nodeCurrentX[0] = y[nodeId*3];
nodeCurrentX[1] = y[nodeId*3+1];
nodeCurrentX[2] = y[nodeId*3+2];
numNeighbors = neighborhoodList[neighborhoodListIndex++];
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
neighborID = neighborhoodList[neighborhoodListIndex++];
const double neighborCriticalStretch = criticalStretch[neighborID];
// Skip neighbors that do not allow bond breaking or bonds that are already broken
if(bondDamage[bondIndex]!=0.0 || neighborCriticalStretch == 0.0){bondIndex+=1;continue;}
TEUCHOS_TEST_FOR_EXCEPTION(neighborCriticalStretch==0.0,std::logic_error,"Error: Neighbor critical stretch cannot be zero at this point.");
const double minCriticalStretch = (neighborCriticalStretch < m_criticalStretch) ? neighborCriticalStretch : m_criticalStretch;
initialDistance =
distance(nodeInitialX[0], nodeInitialX[1], nodeInitialX[2],
x[neighborID*3], x[neighborID*3+1], x[neighborID*3+2]);
currentDistance =
distance(nodeCurrentX[0], nodeCurrentX[1], nodeCurrentX[2],
y[neighborID*3], y[neighborID*3+1], y[neighborID*3+2]);
if(m_applyThermalStrains)
currentDistance -= m_alpha*deltaTemperature[nodeId]*initialDistance;
relativeExtension = (currentDistance - initialDistance)/initialDistance;
trialDamage = 0.0;
if(relativeExtension > minCriticalStretch)
{
trialDamage = 1.0;
}
if(trialDamage > bondDamage[bondIndex]){
bondDamage[bondIndex] = trialDamage;
}
bondIndex += 1;
}
}
TEUCHOS_TEST_FOR_EXCEPTION(m_bcManager==Teuchos::null,std::logic_error,"Error: the bc manager pointer should have been set by here.");
Teuchos::RCP< std::map< std::string, std::vector<int> > > nodeSetMap = m_bcManager->getNodeSets();
// Update the element damage (percent of bonds broken)
neighborhoodListIndex = 0;
bondIndex = 0;
for(iID=0 ; iID<numOwnedPoints ; ++iID){
nodeId = ownedIDs[iID];
numNeighbors = neighborhoodList[neighborhoodListIndex++];
neighborhoodListIndex += numNeighbors;
totalDamage = 0.0;
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
totalDamage += bondDamage[bondIndex++];
}
if(totalDamage >= numNeighbors-2) // This would imply rank deficiency and would lead to problems in CG
{
const string deficientSetName = "RANK_DEFICIENT_NODES";
TEUCHOS_TEST_FOR_EXCEPTION(nodeSetMap->find(deficientSetName)==nodeSetMap->end(),std::logic_error,"Error: The placeholder nodeset for rank deficient nodes is missing.");
bool nodeAlreadyRegistered = false;
vector<int> * deficientSet = &nodeSetMap->find(deficientSetName)->second;
for(unsigned i=0;i<deficientSet->size();++i)
if((*deficientSet)[i]==nodeId)
nodeAlreadyRegistered = true;
if(!nodeAlreadyRegistered){
cout << "Warning: Potentially rank deficient node detected (Node with 2 or less bonds). " << endl
<< "Node " << nodeId + 1 << " will be removed from the linear system." << endl;
deficientSet->push_back(nodeId);
// if the node is removed from the linear system break all its bonds
bondIndex -= numNeighbors;
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
bondDamage[bondIndex++] = 1.0;
}
totalDamage = numNeighbors;
}
}
if(numNeighbors > 0)
totalDamage /= numNeighbors;
else
totalDamage = 0.0;
damage[nodeId] = totalDamage;
}
}
void
PeridigmNS::ShortRangeForceContactModel::computeForce(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* contactNeighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
// Zero out the forces
dataManager.getData(m_contactForceDensityFieldId, PeridigmField::STEP_NP1)->PutScalar(0.0);
double *cellVolume, *y, *contactForce, *velocity;
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&cellVolume);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_velocityFieldId, PeridigmField::STEP_NP1)->ExtractView(&velocity);
dataManager.getData(m_contactForceDensityFieldId, PeridigmField::STEP_NP1)->ExtractView(&contactForce);
int neighborhoodListIndex(0), numNeighbors, nodeID, neighborID, iID, iNID;
double nodeCurrentX[3], nodeCurrentV[3], nodeVolume, currentDistance, c, temp, neighborVolume;
double normal[3], currentDotNormal, currentDotNeighbor, nodeCurrentVperp[3], nodeNeighborVperp[3], Vcm[3], nodeCurrentVrel[3], nodeNeighborVrel[3];
double normCurrentVrel, normNeighborVrel, currentNormalForce[3], neighborNormalForce[3], normCurrentNormalForce, normNeighborNormalForce, currentFrictionForce[3], neighborFrictionForce[3];
double currentDistanceSquared;
double contactRadiusSquared = m_contactRadius*m_contactRadius;
const double pi = boost::math::constants::pi<double>();
for(iID=0 ; iID<numOwnedPoints ; ++iID){
numNeighbors = contactNeighborhoodList[neighborhoodListIndex++];
if(numNeighbors > 0){
nodeID = ownedIDs[iID];
nodeCurrentX[0] = y[nodeID*3];
nodeCurrentX[1] = y[nodeID*3+1];
nodeCurrentX[2] = y[nodeID*3+2];
nodeCurrentV[0] = velocity[nodeID*3];
nodeCurrentV[1] = velocity[nodeID*3+1];
nodeCurrentV[2] = velocity[nodeID*3+2];
nodeVolume = cellVolume[nodeID];
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
neighborID = contactNeighborhoodList[neighborhoodListIndex++];
TEUCHOS_TEST_FOR_EXCEPT_MSG(neighborID < 0, "Invalid neighbor list\n");
currentDistanceSquared = distanceSquared(nodeCurrentX[0], nodeCurrentX[1], nodeCurrentX[2],
y[neighborID*3], y[neighborID*3+1], y[neighborID*3+2]);
if(currentDistanceSquared < contactRadiusSquared){
currentDistance = distance(nodeCurrentX[0], nodeCurrentX[1], nodeCurrentX[2],
y[neighborID*3], y[neighborID*3+1], y[neighborID*3+2]);
c = 9.0*m_springConstant/(pi*m_horizon*m_horizon*m_horizon*m_horizon); // half value (of 18) due to force being applied to both nodes
temp = c*(m_contactRadius - currentDistance)/m_horizon;
neighborVolume = cellVolume[neighborID];
if (m_frictionCoefficient != 0.0){
// calculate the perpendicular velocity of the current node wrt the vector between the nodes
normal[0] = (y[neighborID*3] - nodeCurrentX[0])/currentDistance;
normal[1] = (y[neighborID*3+1] - nodeCurrentX[1])/currentDistance;
normal[2] = (y[neighborID*3+2] - nodeCurrentX[2])/currentDistance;
currentDotNormal = nodeCurrentV[0]*normal[0] +
nodeCurrentV[1]*normal[1] +
nodeCurrentV[2]*normal[2];
currentDotNeighbor = velocity[neighborID*3]*normal[0] +
velocity[neighborID*3+1]*normal[1] +
velocity[neighborID*3+2]*normal[2];
nodeCurrentVperp[0] = nodeCurrentV[0] - currentDotNormal*normal[0];
nodeCurrentVperp[1] = nodeCurrentV[1] - currentDotNormal*normal[1];
nodeCurrentVperp[2] = nodeCurrentV[2] - currentDotNormal*normal[2];
nodeNeighborVperp[0] = velocity[neighborID*3] - currentDotNeighbor*normal[0];
nodeNeighborVperp[1] = velocity[neighborID*3+1] - currentDotNeighbor*normal[1];
nodeNeighborVperp[2] = velocity[neighborID*3+2] - currentDotNeighbor*normal[2];
// calculate frame of reference for the perpendicular velocities
Vcm[0] = 0.5*(nodeCurrentVperp[0] + nodeNeighborVperp[0]);
Vcm[1] = 0.5*(nodeCurrentVperp[1] + nodeNeighborVperp[1]);
Vcm[2] = 0.5*(nodeCurrentVperp[2] + nodeNeighborVperp[2]);
// calculate the relative velocity of the current node wrt the neighboring node and vice versa
nodeCurrentVrel[0] = nodeCurrentVperp[0] - Vcm[0];
nodeCurrentVrel[1] = nodeCurrentVperp[1] - Vcm[1];
nodeCurrentVrel[2] = nodeCurrentVperp[2] - Vcm[2];
nodeNeighborVrel[0] = nodeNeighborVperp[0] - Vcm[0];
nodeNeighborVrel[1] = nodeNeighborVperp[1] - Vcm[1];
nodeNeighborVrel[2] = nodeNeighborVperp[2] - Vcm[2];
normCurrentVrel = sqrt(nodeCurrentVrel[0]*nodeCurrentVrel[0] +
nodeCurrentVrel[1]*nodeCurrentVrel[1] +
nodeCurrentVrel[2]*nodeCurrentVrel[2]);
normNeighborVrel = sqrt(nodeNeighborVrel[0]*nodeNeighborVrel[0] +
nodeNeighborVrel[1]*nodeNeighborVrel[1] +
nodeNeighborVrel[2]*nodeNeighborVrel[2]);
// calculate the normal forces
currentNormalForce[0] = -(temp*neighborVolume*(y[neighborID*3] - nodeCurrentX[0])/currentDistance);
currentNormalForce[1] = -(temp*neighborVolume*(y[neighborID*3+1] - nodeCurrentX[1])/currentDistance);
currentNormalForce[2] = -(temp*neighborVolume*(y[neighborID*3+2] - nodeCurrentX[2])/currentDistance);
neighborNormalForce[0] = (temp*nodeVolume*(y[neighborID*3] - nodeCurrentX[0])/currentDistance);
neighborNormalForce[1] = (temp*nodeVolume*(y[neighborID*3+1] - nodeCurrentX[1])/currentDistance);
neighborNormalForce[2] = (temp*nodeVolume*(y[neighborID*3+2] - nodeCurrentX[2])/currentDistance);
normCurrentNormalForce = sqrt(currentNormalForce[0]*currentNormalForce[0] +
currentNormalForce[1]*currentNormalForce[1] +
currentNormalForce[2]*currentNormalForce[2]);
normNeighborNormalForce = sqrt(neighborNormalForce[0]*neighborNormalForce[0] +
neighborNormalForce[1]*neighborNormalForce[1] +
neighborNormalForce[2]*neighborNormalForce[2]);
// calculate the friction forces
if (normCurrentVrel != 0.0) {
currentFrictionForce[0] = -m_frictionCoefficient*normCurrentNormalForce*nodeCurrentVrel[0]/normCurrentVrel;
currentFrictionForce[1] = -m_frictionCoefficient*normCurrentNormalForce*nodeCurrentVrel[1]/normCurrentVrel;
currentFrictionForce[2] = -m_frictionCoefficient*normCurrentNormalForce*nodeCurrentVrel[2]/normCurrentVrel;
}
else {
currentFrictionForce[0] = 0.0;
currentFrictionForce[1] = 0.0;
currentFrictionForce[2] = 0.0;
}
if (normNeighborVrel != 0.0) {
neighborFrictionForce[0] = -m_frictionCoefficient*normNeighborNormalForce*nodeNeighborVrel[0]/normNeighborVrel;
neighborFrictionForce[1] = -m_frictionCoefficient*normNeighborNormalForce*nodeNeighborVrel[1]/normNeighborVrel;
neighborFrictionForce[2] = -m_frictionCoefficient*normNeighborNormalForce*nodeNeighborVrel[2]/normNeighborVrel;
}
else {
neighborFrictionForce[0] = 0.0;
neighborFrictionForce[1] = 0.0;
neighborFrictionForce[2] = 0.0;
}
// compute total contributions to force density
contactForce[nodeID*3] += currentNormalForce[0] + currentFrictionForce[0];
contactForce[nodeID*3+1] += currentNormalForce[1] + currentFrictionForce[1];
contactForce[nodeID*3+2] += currentNormalForce[2] + currentFrictionForce[2];
contactForce[neighborID*3] += neighborNormalForce[0] + neighborFrictionForce[0];
contactForce[neighborID*3+1] += neighborNormalForce[1] + neighborFrictionForce[1];
contactForce[neighborID*3+2] += neighborNormalForce[2] + neighborFrictionForce[2];
}
else {
// compute contributions to force density (Normal Force Only)
contactForce[nodeID*3] -= temp*neighborVolume*(y[neighborID*3] - nodeCurrentX[0])/currentDistance;
contactForce[nodeID*3+1] -= temp*neighborVolume*(y[neighborID*3+1] - nodeCurrentX[1])/currentDistance;
contactForce[nodeID*3+2] -= temp*neighborVolume*(y[neighborID*3+2] - nodeCurrentX[2])/currentDistance;
contactForce[neighborID*3] += temp*nodeVolume*(y[neighborID*3] - nodeCurrentX[0])/currentDistance;
contactForce[neighborID*3+1] += temp*nodeVolume*(y[neighborID*3+1] - nodeCurrentX[1])/currentDistance;
contactForce[neighborID*3+2] += temp*nodeVolume*(y[neighborID*3+2] - nodeCurrentX[2])/currentDistance;
}
}
}
}
}
}
void
PeridigmNS::CriticalStretchDamageModel::computeDamage(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
double *x, *y, *damage, *bondDamageN, *bondDamageNP1, *deltaTemperature;
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_damageFieldId, PeridigmField::STEP_NP1)->ExtractView(&damage);
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_N)->ExtractView(&bondDamageN);
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1)->ExtractView(&bondDamageNP1);
deltaTemperature = NULL;
if(m_applyThermalStrains)
dataManager.getData(m_deltaTemperatureFieldId, PeridigmField::STEP_NP1)->ExtractView(&deltaTemperature);
double trialDamage(0.0);
int neighborhoodListIndex(0), bondIndex(0);
int nodeId, numNeighbors, neighborID, iID, iNID;
double nodeInitialX[3], nodeCurrentX[3], initialDistance, currentDistance, relativeExtension, totalDamage;
// Set the bond damage to the previous value
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_NP1) =
dataManager.getData(m_bondDamageFieldId, PeridigmField::STEP_N);
// Update the bond damage
// Break bonds if the extension is greater than the critical extension
for(iID=0 ; iID<numOwnedPoints ; ++iID){
nodeId = ownedIDs[iID];
nodeInitialX[0] = x[nodeId*3];
nodeInitialX[1] = x[nodeId*3+1];
nodeInitialX[2] = x[nodeId*3+2];
nodeCurrentX[0] = y[nodeId*3];
nodeCurrentX[1] = y[nodeId*3+1];
nodeCurrentX[2] = y[nodeId*3+2];
numNeighbors = neighborhoodList[neighborhoodListIndex++];
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
neighborID = neighborhoodList[neighborhoodListIndex++];
initialDistance =
distance(nodeInitialX[0], nodeInitialX[1], nodeInitialX[2],
x[neighborID*3], x[neighborID*3+1], x[neighborID*3+2]);
currentDistance =
distance(nodeCurrentX[0], nodeCurrentX[1], nodeCurrentX[2],
y[neighborID*3], y[neighborID*3+1], y[neighborID*3+2]);
if(m_applyThermalStrains)
currentDistance -= m_alpha*deltaTemperature[nodeId]*initialDistance;
relativeExtension = (currentDistance - initialDistance)/initialDistance;
trialDamage = 0.0;
if(relativeExtension > m_criticalStretch)
trialDamage = 1.0;
if(trialDamage > bondDamageNP1[bondIndex]){
bondDamageNP1[bondIndex] = trialDamage;
}
bondIndex += 1;
}
}
// Update the element damage (percent of bonds broken)
neighborhoodListIndex = 0;
bondIndex = 0;
for(iID=0 ; iID<numOwnedPoints ; ++iID){
nodeId = ownedIDs[iID];
numNeighbors = neighborhoodList[neighborhoodListIndex++];
neighborhoodListIndex += numNeighbors;
totalDamage = 0.0;
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
totalDamage += bondDamageNP1[bondIndex++];
}
if(numNeighbors > 0)
totalDamage /= numNeighbors;
else
totalDamage = 0.0;
damage[nodeId] = totalDamage;
}
}
void
PeridigmNS::VectorPoissonMaterial::computeForce(const double dt,
const int numOwnedPoints,
const int* ownedIDs,
const int* neighborhoodList,
PeridigmNS::DataManager& dataManager) const
{
// Zero out the forces
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->PutScalar(0.0);
// Extract pointers to the underlying data
double *volume, *x, *y, *f;
dataManager.getData(m_volumeFieldId, PeridigmField::STEP_NONE)->ExtractView(&volume);
dataManager.getData(m_modelCoordinatesFieldId, PeridigmField::STEP_NONE)->ExtractView(&x);
dataManager.getData(m_coordinatesFieldId, PeridigmField::STEP_NP1)->ExtractView(&y);
dataManager.getData(m_forceDensityFieldId, PeridigmField::STEP_NP1)->ExtractView(&f);
int neighborhoodListIndex(0);
int numNeighbors, neighborID, iID, iNID;
double nodeInitialPosition[3], initialDistance;
double nodeU, neighborU, kernel, nodeVolume, neighborVolume, temp, nodeForce, neighborForce;
const double pi = boost::math::constants::pi<double>();
for(iID=0 ; iID<numOwnedPoints ; ++iID){
nodeVolume = volume[iID];
nodeInitialPosition[0] = x[iID*3];
nodeInitialPosition[1] = x[iID*3+1];
nodeInitialPosition[2] = x[iID*3+2];
numNeighbors = neighborhoodList[neighborhoodListIndex++];
for(iNID=0 ; iNID<numNeighbors ; ++iNID){
neighborID = neighborhoodList[neighborhoodListIndex++];
neighborVolume = volume[neighborID];
initialDistance = distance(nodeInitialPosition[0], nodeInitialPosition[1], nodeInitialPosition[2],
x[neighborID*3], x[neighborID*3+1], x[neighborID*3+2]);
kernel = 3.0/(pi*m_horizon*m_horizon*m_horizon*m_horizon*initialDistance);
// We are solving a Poisson equation
// The function is lives in three-dimensional space and has a one-dimensional scalar output
// Because the code infrastructure assumes both 3D input and output, we'll just solve three
// instances of the problem at once.
for(int eqn=0 ; eqn<3 ; ++eqn){
nodeU = y[iID*3+eqn] - x[iID*3+eqn];
neighborU = y[neighborID*3+eqn] - x[neighborID*3+eqn];
temp = (neighborU - nodeU)*kernel;
nodeForce = temp*neighborVolume;
neighborForce = -temp*nodeVolume;
TEUCHOS_TEST_FOR_EXCEPT_MSG(!boost::math::isfinite(nodeForce), "**** NaN detected in VectorPoissonMaterial::computeForce().\n");
TEUCHOS_TEST_FOR_EXCEPT_MSG(!boost::math::isfinite(neighborForce), "**** NaN detected in VectorPoissonMaterial::computeForce().\n");
f[iID*3+eqn] += nodeForce;
f[neighborID*3+eqn] += neighborForce;
}
}
}
}
