void ForwardEulerNumericalMethod<ELEMENT_DIM,SPACE_DIM>::UpdateAllNodePositions(double dt)
{
if (!this->mUseUpdateNodeLocation)
{
// Apply forces to each cell, and save a vector of net forces F
std::vector<c_vector<double, SPACE_DIM> > forces = this->ComputeForcesIncludingDamping();
unsigned index = 0;
for (typename AbstractMesh<ELEMENT_DIM, SPACE_DIM>::NodeIterator node_iter = this->mpCellPopulation->rGetMesh().GetNodeIteratorBegin();
node_iter != this->mpCellPopulation->rGetMesh().GetNodeIteratorEnd();
++node_iter, ++index)
{
// Get the current node location and calculate the new location according to the forward Euler method
const c_vector<double, SPACE_DIM>& r_old_location = node_iter->rGetLocation();
c_vector<double, SPACE_DIM> displacement = dt * forces[index];
// In the vertex-based case, the displacement may be scaled if the cell rearrangement threshold is exceeded
this->DetectStepSizeExceptions(node_iter->GetIndex(), displacement, dt);
c_vector<double, SPACE_DIM> new_location = r_old_location + displacement;
this->SafeNodePositionUpdate(node_iter->GetIndex(), new_location);
}
}
else
{
/*
* If this type of cell population does not support the new numerical methods, delegate
* updating node positions to the population itself.
*
* This only applies to NodeBasedCellPopulationWithBuskeUpdates.
*/
this->mpCellPopulation->UpdateNodeLocations(dt);
}
}
void NodeBasedCellPopulationWithParticles<DIM>::Validate()
{
std::map<unsigned, bool> validated_nodes;
for (typename AbstractMesh<DIM, DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
validated_nodes[node_iter->GetIndex()] = node_iter->IsParticle();
}
// Look through all of the cells and record what node they are associated with.
for (typename AbstractCellPopulation<DIM>::Iterator cell_iter=this->Begin(); cell_iter!=this->End(); ++cell_iter)
{
unsigned node_index = this->GetLocationIndexUsingCell((*cell_iter));
// If the node attached to this cell is labelled as a particle, then throw an error
if (this->GetNode(node_index)->IsParticle())
{
EXCEPTION("Node " << node_index << " is labelled as a particle and has a cell attached");
}
validated_nodes[node_index] = true;
}
for (std::map<unsigned, bool>::iterator map_iter = validated_nodes.begin();
map_iter != validated_nodes.end();
map_iter++)
{
if (!map_iter->second)
{
EXCEPTION("Node " << map_iter->first << " does not appear to be a particle or has a cell associated with it");
}
}
}
void NodeBasedCellPopulationWithParticles<DIM>::UpdateParticlePositions(double dt)
{
// Initialise vector of forces on particles
std::vector<c_vector<double, DIM> > drdt(this->GetNumNodes());
for (unsigned i=0; i<drdt.size(); i++)
{
drdt[i] = zero_vector<double>(DIM);
}
// Calculate forces on particles
double damping_constant = this->GetDampingConstantNormal();
for (unsigned i=0; i<drdt.size(); i++)
{
drdt[i] = this->GetNode(i)->rGetAppliedForce()/damping_constant;
}
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
if (node_iter->IsParticle())
{
ChastePoint<DIM> new_point(node_iter->rGetLocation() + dt*drdt[node_iter->GetIndex()]);
node_iter->SetPoint(new_point);
}
}
}
void NodeBasedCellPopulation<DIM>::Validate()
{
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
try
{
this->GetCellUsingLocationIndex(node_iter->GetIndex());
}
catch (Exception&)
{
EXCEPTION("Node " << node_iter->GetIndex() << " does not appear to have a cell associated with it");
}
}
}
void TCellDiffusionForce<DIM>::AddForceContribution(AbstractCellPopulation<DIM>& rCellPopulation)
{
double dt = SimulationTime::Instance()->GetTimeStep();
// Iterate over the nodes
for (typename AbstractMesh<DIM, DIM>::NodeIterator node_iter = rCellPopulation.rGetMesh().GetNodeIteratorBegin();
node_iter != rCellPopulation.rGetMesh().GetNodeIteratorEnd();
++node_iter)
{
// Get the radius of this node
unsigned node_index = node_iter->GetIndex();
double node_radius = node_iter->GetRadius();
// Get cell associated with this index
CellPtr p_cell = rCellPopulation.GetCellUsingLocationIndex(node_index);
// Reject if no radius has been set
if (node_radius == 0.0)
{
EXCEPTION("SetRadius() must be called on each Node before calling TCellDiffusionForce::AddForceContribution() to avoid a division by zero error");
}
// If the selected cell is a Unlabelled Differentiated T Cell, apply diffusion force contribution.
if ( (p_cell->GetMutationState()->IsType<TCellMutationState>()) && (p_cell->GetCellProliferativeType()->IsType<DifferentiatedCellProliferativeType>())
&& !(p_cell->HasCellProperty<CellLabel>()) )
{
double nu = dynamic_cast<AbstractOffLatticeCellPopulation<DIM>*>(&rCellPopulation)->GetDampingConstant(node_index);
/* Compute the diffusion coefficient D as D = k*T/(6*pi*eta*r), where
*
* k = Boltzmann's constant,
* T = absolute temperature,
* eta = dynamic viscosity,
* r = cell radius. */
double diffusion_const_scaling = GetDiffusionScalingConstant();
double diffusion_constant = diffusion_const_scaling/node_radius;
c_vector<double, DIM> force_contribution;
for (unsigned i=0; i<DIM; i++)
{
/* The force on this cell is scaled with the timestep such that when it is
* used in the discretised equation of motion for the cell, we obtain the
* correct formula
*
* x_new = x_old + sqrt(2*D*dt)*W
*
* where W is a standard normal random variable. */
double xi = RandomNumberGenerator::Instance()->StandardNormalRandomDeviate();
force_contribution[i] = mStrengthParameter * ((nu*sqrt(2.0*diffusion_constant*dt)/dt)*xi);
}
node_iter->AddAppliedForceContribution(force_contribution);
}
}
}
void MeshBasedCellPopulationWithGhostNodes<DIM>::AcceptCellWritersAcrossPopulation()
{
for (typename AbstractMesh<DIM, DIM>::NodeIterator node_iter = this->rGetMesh().GetNodeIteratorBegin();
node_iter != this->rGetMesh().GetNodeIteratorEnd();
++node_iter)
{
// If it isn't a ghost node then there might be cell writers attached
if (! this->IsGhostNode(node_iter->GetIndex()))
{
for (typename std::vector<boost::shared_ptr<AbstractCellWriter<DIM, DIM> > >::iterator cell_writer_iter = this->mCellWriters.begin();
cell_writer_iter != this->mCellWriters.end();
++cell_writer_iter)
{
CellPtr cell_from_node = this->GetCellUsingLocationIndex(node_iter->GetIndex());
this->AcceptCellWriter(*cell_writer_iter, cell_from_node);
}
}
}
}
void NodeBasedCellPopulationWithParticles<DIM>::SetParticles(const std::set<unsigned>& rParticleIndices)
{
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
if (rParticleIndices.find(node_iter->GetIndex()) != rParticleIndices.end())
{
node_iter->SetIsParticle(true);
}
}
NodeBasedCellPopulationWithParticles::Validate();
}
std::set<unsigned> NodeBasedCellPopulationWithParticles<DIM>::GetParticleIndices()
{
std::set<unsigned> particle_indices;
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
if (node_iter->IsParticle())
{
particle_indices.insert(node_iter->GetIndex());
}
}
return particle_indices;
}
void MeshBasedCellPopulationWithGhostNodes<DIM>::ApplyGhostForces(){
// Initialise vector of forces on ghost nodes
std::vector<c_vector<double, DIM> > drdt(this->GetNumNodes());
for (unsigned i=0; i<drdt.size(); i++)
{
drdt[i] = zero_vector<double>(DIM);
}
// Calculate forces on ghost nodes
for (typename MutableMesh<DIM, DIM>::EdgeIterator edge_iterator = static_cast<MutableMesh<DIM, DIM>&>((this->mrMesh)).EdgesBegin();
edge_iterator != static_cast<MutableMesh<DIM, DIM>&>((this->mrMesh)).EdgesEnd();
++edge_iterator)
{
unsigned nodeA_global_index = edge_iterator.GetNodeA()->GetIndex();
unsigned nodeB_global_index = edge_iterator.GetNodeB()->GetIndex();
c_vector<double, DIM> force = CalculateForceBetweenGhostNodes(nodeA_global_index, nodeB_global_index);
if (!this->mIsGhostNode[nodeA_global_index])
{
drdt[nodeB_global_index] -= force;
}
else
{
drdt[nodeA_global_index] += force;
if (this->mIsGhostNode[nodeB_global_index])
{
drdt[nodeB_global_index] -= force;
}
}
}
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
unsigned node_index = node_iter->GetIndex();
if (this->mIsGhostNode[node_index])
{
node_iter->ClearAppliedForce();
node_iter->AddAppliedForceContribution(drdt[node_index]);
}
}
};
NodeBasedCellPopulationWithParticles<DIM>::NodeBasedCellPopulationWithParticles(NodesOnlyMesh<DIM>& rMesh,
std::vector<CellPtr>& rCells,
const std::vector<unsigned> locationIndices,
bool deleteMesh)
: NodeBasedCellPopulation<DIM>(rMesh, rCells, locationIndices, deleteMesh, false)
{
EXCEPT_IF_NOT(PetscTools::IsSequential());
if (!locationIndices.empty())
{
// Create a set of node indices corresponding to particles
std::set<unsigned> node_indices;
std::set<unsigned> location_indices;
std::set<unsigned> particle_indices;
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = rMesh.GetNodeIteratorBegin();
node_iter != rMesh.GetNodeIteratorEnd();
++node_iter)
{
node_indices.insert(node_iter->GetIndex());
}
for (unsigned i=0; i<locationIndices.size(); i++)
{
location_indices.insert(locationIndices[i]);
}
std::set_difference(node_indices.begin(), node_indices.end(),
location_indices.begin(), location_indices.end(),
std::inserter(particle_indices, particle_indices.begin()));
// This method finishes and then calls Validate()
SetParticles(particle_indices);
}
else
{
for (typename NodesOnlyMesh<DIM>::NodeIterator node_iter = rMesh.GetNodeIteratorBegin();
node_iter != rMesh.GetNodeIteratorEnd();
++node_iter)
{
(*node_iter).SetIsParticle(false);
}
NodeBasedCellPopulationWithParticles::Validate();
}
}
void NodeBasedCellPopulationWithParticles<DIM>::WriteVtkResultsToFile(const std::string& rDirectory)
{
#ifdef CHASTE_VTK
// Store the present time as a string
std::stringstream time;
time << SimulationTime::Instance()->GetTimeStepsElapsed();
// Make sure the nodes are ordered contiguously in memory
NodeMap map(1 + this->mpNodesOnlyMesh->GetMaximumNodeIndex());
this->mpNodesOnlyMesh->ReMesh(map);
// Store the number of cells for which to output data to VTK
unsigned num_nodes = this->GetNumNodes();
std::vector<double> rank(num_nodes);
std::vector<double> particles(num_nodes);
unsigned num_cell_data_items = 0;
std::vector<std::string> cell_data_names;
// We assume that the first cell is representative of all cells
if (num_nodes > 0)
{
num_cell_data_items = this->Begin()->GetCellData()->GetNumItems();
cell_data_names = this->Begin()->GetCellData()->GetKeys();
}
std::vector<std::vector<double> > cell_data;
for (unsigned var=0; var<num_cell_data_items; var++)
{
std::vector<double> cell_data_var(num_nodes);
cell_data.push_back(cell_data_var);
}
// Create mesh writer for VTK output
VtkMeshWriter<DIM, DIM> mesh_writer(rDirectory, "results_"+time.str(), false);
mesh_writer.SetParallelFiles(*(this->mpNodesOnlyMesh));
// Iterate over any cell writers that are present
for (typename std::vector<boost::shared_ptr<AbstractCellWriter<DIM, DIM> > >::iterator cell_writer_iter = this->mCellWriters.begin();
cell_writer_iter != this->mCellWriters.end();
++cell_writer_iter)
{
// Create vector to store VTK cell data
std::vector<double> vtk_cell_data(num_nodes);
// Loop over nodes
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
unsigned node_index = node_iter->GetIndex();
// If this node is a particle (not a cell), then we set the 'dummy' VTK cell data for this to be -2.0...
if (this->IsParticle(node_index))
{
vtk_cell_data[node_index] = -2.0;
}
else
{
// ...otherwise we populate the vector of VTK cell data as usual
CellPtr p_cell = this->GetCellUsingLocationIndex(node_index);
vtk_cell_data[node_index] = (*cell_writer_iter)->GetCellDataForVtkOutput(p_cell, this);
}
}
mesh_writer.AddPointData((*cell_writer_iter)->GetVtkCellDataName(), vtk_cell_data);
}
// Loop over cells
for (typename AbstractCellPopulation<DIM>::Iterator cell_iter = this->Begin();
cell_iter != this->End();
++cell_iter)
{
// Get the node index corresponding to this cell
unsigned global_index = this->GetLocationIndexUsingCell(*cell_iter);
unsigned node_index = this->rGetMesh().SolveNodeMapping(global_index);
for (unsigned var=0; var<num_cell_data_items; var++)
{
cell_data[var][node_index] = cell_iter->GetCellData()->GetItem(cell_data_names[var]);
}
rank[node_index] = (PetscTools::GetMyRank());
}
mesh_writer.AddPointData("Process rank", rank);
// Loop over nodes
for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
unsigned node_index = node_iter->GetIndex();
particles[node_index] = (double) (this->IsParticle(node_index));
}
mesh_writer.AddPointData("Non-particles", particles);
if (num_cell_data_items > 0)
{
for (unsigned var=0; var<cell_data.size(); var++)
{
mesh_writer.AddPointData(cell_data_names[var], cell_data[var]);
}
}
mesh_writer.WriteFilesUsingMesh(*(this->mpNodesOnlyMesh));
*(this->mpVtkMetaFile) << " <DataSet timestep=\"";
*(this->mpVtkMetaFile) << SimulationTime::Instance()->GetTimeStepsElapsed();
*(this->mpVtkMetaFile) << "\" group=\"\" part=\"0\" file=\"results_";
*(this->mpVtkMetaFile) << SimulationTime::Instance()->GetTimeStepsElapsed();
EXCEPT_IF_NOT(PetscTools::IsSequential());
{
*(this->mpVtkMetaFile) << ".vtu\"/>\n";
}
/* {
// Parallel vtu files .vtu -> .pvtu
*(this->mpVtkMetaFile) << ".pvtu\"/>\n";
}*/
#endif //CHASTE_VTK
}
void AbstractContinuumMechanicsSolver<DIM>::AllocateMatrixMemory()
{
Vec template_vec = mrQuadMesh.GetDistributedVectorFactory()->CreateVec(mProblemDimension);
///////////////////////////
// three vectors
///////////////////////////
VecDuplicate(template_vec, &mResidualVector);
VecDuplicate(mResidualVector, &mLinearSystemRhsVector);
// the one is only allocated if it will be needed (in ApplyDirichletBoundaryConditions),
// depending on whether the matrix is kept symmetric.
mDirichletBoundaryConditionsVector = NULL;
PetscTools::Destroy(template_vec);
///////////////////////////
// two matrices
///////////////////////////
int lo, hi;
VecGetOwnershipRange(mResidualVector, &lo, &hi);
PetscInt local_size = hi - lo;
if (DIM==2)
{
// 2D: N elements around a point => 7N+3 non-zeros in that row? Assume N<=10 (structured mesh would have N_max=6) => 73.
unsigned num_non_zeros = std::min(75u, mNumDofs);
PetscTools::SetupMat(mSystemLhsMatrix, mNumDofs, mNumDofs, num_non_zeros, local_size, local_size);
PetscTools::SetupMat(mPreconditionMatrix, mNumDofs, mNumDofs, num_non_zeros, local_size, local_size);
}
else
{
assert(DIM==3);
// in 3d we get the number of containing elements for each node and use that to obtain an upper bound
// for the number of non-zeros for each DOF associated with that node.
int* num_non_zeros_each_row = new int[mNumDofs];
for (unsigned i=0; i<mNumDofs; i++)
{
num_non_zeros_each_row[i] = 0;
}
for (typename AbstractMesh<DIM,DIM>::NodeIterator iter = mrQuadMesh.GetNodeIteratorBegin();
iter != mrQuadMesh.GetNodeIteratorEnd();
++iter)
{
// this upper bound neglects the fact that two containing elements will share the same nodes..
// 4 = max num dofs associated with this node
// 30 = 3*9+3 = 3 dimensions x 9 other nodes on this element + 3 vertices with a pressure unknown
unsigned num_non_zeros_upper_bound = 4 + 30*iter->GetNumContainingElements();
num_non_zeros_upper_bound = std::min(num_non_zeros_upper_bound, mNumDofs);
unsigned i = iter->GetIndex();
num_non_zeros_each_row[mProblemDimension*i + 0] = num_non_zeros_upper_bound;
num_non_zeros_each_row[mProblemDimension*i + 1] = num_non_zeros_upper_bound;
num_non_zeros_each_row[mProblemDimension*i + 2] = num_non_zeros_upper_bound;
if (mCompressibilityType==INCOMPRESSIBLE)
{
if(!iter->IsInternal())
{
num_non_zeros_each_row[mProblemDimension*i + 3] = num_non_zeros_upper_bound;
}
else
{
num_non_zeros_each_row[mProblemDimension*i + 3] = 1;
}
}
}
// NOTE: PetscTools::SetupMat() or the below creates a MATAIJ matrix, which means the matrix will
// be of type MATSEQAIJ if num_procs=1 and MATMPIAIJ otherwise. In the former case
// MatSeqAIJSetPreallocation MUST be called [MatMPIAIJSetPreallocation will have
// no effect (silently)], and vice versa in the latter case
/// We want to allocate different numbers of non-zeros per row, which means
/// PetscTools::SetupMat isn't that useful. We could call
//PetscTools::SetupMat(mSystemLhsMatrix, mNumDofs, mNumDofs, 0, PETSC_DECIDE, PETSC_DECIDE);
//PetscTools::SetupMat(mPreconditionMatrix, mNumDofs, mNumDofs, 0, PETSC_DECIDE, PETSC_DECIDE);
/// but we would get warnings due to the lack allocation
// possible todo: create a PetscTools::SetupMatNoAllocation()
#if (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 2) //PETSc 2.2
MatCreate(PETSC_COMM_WORLD,local_size,local_size,mNumDofs,mNumDofs,&mSystemLhsMatrix);
MatCreate(PETSC_COMM_WORLD,local_size,local_size,mNumDofs,mNumDofs,&mPreconditionMatrix);
#else //New API
MatCreate(PETSC_COMM_WORLD,&mSystemLhsMatrix);
MatCreate(PETSC_COMM_WORLD,&mPreconditionMatrix);
MatSetSizes(mSystemLhsMatrix,local_size,local_size,mNumDofs,mNumDofs);
MatSetSizes(mPreconditionMatrix,local_size,local_size,mNumDofs,mNumDofs);
#endif
if (PetscTools::IsSequential())
{
MatSetType(mSystemLhsMatrix, MATSEQAIJ);
MatSetType(mPreconditionMatrix, MATSEQAIJ);
MatSeqAIJSetPreallocation(mSystemLhsMatrix, PETSC_DEFAULT, num_non_zeros_each_row);
MatSeqAIJSetPreallocation(mPreconditionMatrix, PETSC_DEFAULT, num_non_zeros_each_row);
}
else
{
int* num_non_zeros_each_row_in_diag = new int[local_size];
int* num_non_zeros_each_row_off_diag = new int[local_size];
for (unsigned i=0; i<unsigned(local_size); i++)
{
num_non_zeros_each_row_in_diag[i] = num_non_zeros_each_row[lo+i];
num_non_zeros_each_row_off_diag[i] = num_non_zeros_each_row[lo+i];
// In the on process ("diagonal block") there cannot be more non-zero columns specified than there are rows
if(num_non_zeros_each_row_in_diag[i] > local_size)
{
num_non_zeros_each_row_in_diag[i] = local_size;
}
}
MatSetType(mSystemLhsMatrix, MATMPIAIJ);
MatSetType(mPreconditionMatrix, MATMPIAIJ);
MatMPIAIJSetPreallocation(mSystemLhsMatrix, PETSC_DEFAULT, num_non_zeros_each_row_in_diag, PETSC_DEFAULT, num_non_zeros_each_row_off_diag);
MatMPIAIJSetPreallocation(mPreconditionMatrix, PETSC_DEFAULT, num_non_zeros_each_row_in_diag, PETSC_DEFAULT, num_non_zeros_each_row_off_diag);
}
MatSetFromOptions(mSystemLhsMatrix);
MatSetFromOptions(mPreconditionMatrix);
#if (PETSC_VERSION_MAJOR == 3) //PETSc 3.x.x
MatSetOption(mSystemLhsMatrix, MAT_IGNORE_OFF_PROC_ENTRIES, PETSC_TRUE);
MatSetOption(mPreconditionMatrix, MAT_IGNORE_OFF_PROC_ENTRIES, PETSC_TRUE);
#else
MatSetOption(mSystemLhsMatrix, MAT_IGNORE_OFF_PROC_ENTRIES);
MatSetOption(mPreconditionMatrix, MAT_IGNORE_OFF_PROC_ENTRIES);
#endif
//unsigned total_non_zeros = 0;
//for (unsigned i=0; i<mNumDofs; i++)
//{
// total_non_zeros += num_non_zeros_each_row[i];
//}
//std::cout << total_non_zeros << " versus " << 500*mNumDofs << "\n" << std::flush;
delete [] num_non_zeros_each_row;
}
}
void PottsBasedCellPopulation<DIM>::WriteVtkResultsToFile(const std::string& rDirectory)
{
#ifdef CHASTE_VTK
unsigned num_timesteps = SimulationTime::Instance()->GetTimeStepsElapsed();
std::stringstream time;
time << num_timesteps;
// Create mesh writer for VTK output
VtkMeshWriter<DIM, DIM> mesh_writer(rDirectory, "results_"+time.str(), false);
// Iterate over any cell writers that are present
unsigned num_nodes = GetNumNodes();
for (typename std::set<boost::shared_ptr<AbstractCellWriter<DIM, DIM> > >::iterator cell_writer_iter = this->mCellWriters.begin();
cell_writer_iter != this->mCellWriters.end();
++cell_writer_iter)
{
// Create vector to store VTK cell data
std::vector<double> vtk_cell_data(num_nodes);
// Iterate over nodes in the mesh
for (typename AbstractMesh<DIM,DIM>::NodeIterator iter = mpPottsMesh->GetNodeIteratorBegin();
iter != mpPottsMesh->GetNodeIteratorEnd();
++iter)
{
// Get the index of this node in the mesh and those elements (i.e. cells) that contain this node
unsigned node_index = iter->GetIndex();
std::set<unsigned> element_indices = iter->rGetContainingElementIndices();
// If there are no elements associated with this node, then we set the value of any VTK cell data to be -1 at this node...
if (element_indices.empty())
{
// Populate the vector of VTK cell data
vtk_cell_data[node_index] = -1.0;
}
else
{
// ... otherwise there should be exactly one element (i.e. cell) containing this node
assert(element_indices.size() == 1);
unsigned elem_index = *(element_indices.begin());
CellPtr p_cell = this->GetCellUsingLocationIndex(elem_index);
// Populate the vector of VTK cell data
vtk_cell_data[node_index] = (*cell_writer_iter)->GetCellDataForVtkOutput(p_cell, this);
}
}
mesh_writer.AddPointData((*cell_writer_iter)->GetVtkCellDataName(), vtk_cell_data);
}
// When outputting any CellData, we assume that the first cell is representative of all cells
unsigned num_cell_data_items = this->Begin()->GetCellData()->GetNumItems();
std::vector<std::string> cell_data_names = this->Begin()->GetCellData()->GetKeys();
std::vector<std::vector<double> > cell_data;
for (unsigned var=0; var<num_cell_data_items; var++)
{
std::vector<double> cell_data_var(num_nodes);
cell_data.push_back(cell_data_var);
}
for (typename AbstractMesh<DIM,DIM>::NodeIterator iter = mpPottsMesh->GetNodeIteratorBegin();
iter != mpPottsMesh->GetNodeIteratorEnd();
++iter)
{
// Get the index of this node in the mesh and those elements (i.e. cells) that contain this node
unsigned node_index = iter->GetIndex();
std::set<unsigned> element_indices = iter->rGetContainingElementIndices();
// If there are no elements associated with this node, then we set the value of any VTK cell data to be -1 at this node...
if (element_indices.empty())
{
for (unsigned var=0; var<num_cell_data_items; var++)
{
cell_data[var][node_index] = -1.0;
}
}
else
{
// ... otherwise there should be exactly one element (i.e. cell) containing this node
assert(element_indices.size() == 1);
unsigned elem_index = *(element_indices.begin());
CellPtr p_cell = this->GetCellUsingLocationIndex(elem_index);
for (unsigned var=0; var<num_cell_data_items; var++)
{
cell_data[var][node_index] = p_cell->GetCellData()->GetItem(cell_data_names[var]);
}
}
}
for (unsigned var=0; var<cell_data.size(); var++)
{
mesh_writer.AddPointData(cell_data_names[var], cell_data[var]);
}
/*
* The current VTK writer can only write things which inherit from AbstractTetrahedralMeshWriter.
* For now, we do an explicit conversion to NodesOnlyMesh. This can be written to VTK then visualized as glyphs.
*/
NodesOnlyMesh<DIM> temp_mesh;
temp_mesh.ConstructNodesWithoutMesh(*mpPottsMesh, 1.5); // This cut-off is arbitrary, as node connectivity is not used here
mesh_writer.WriteFilesUsingMesh(temp_mesh);
*(this->mpVtkMetaFile) << " <DataSet timestep=\"";
*(this->mpVtkMetaFile) << num_timesteps;
*(this->mpVtkMetaFile) << "\" group=\"\" part=\"0\" file=\"results_";
*(this->mpVtkMetaFile) << num_timesteps;
*(this->mpVtkMetaFile) << ".vtu\"/>\n";
#endif //CHASTE_VTK
}
void MeshBasedCellPopulation<ELEMENT_DIM,SPACE_DIM>::Update(bool hasHadBirthsOrDeaths)
{
///\todo check if there is a more efficient way of keeping track of node velocity information (#2404)
bool output_node_velocities = (this-> template HasWriter<NodeVelocityWriter>());
/**
* If node radii are set, then we must keep a record of these, since they will be cleared during
* the remeshing process. We then restore these attributes to the nodes after calling ReMesh().
*
* At present, we check whether node radii are set by interrogating the radius of the first node
* in the mesh and asking if it is strictly greater than zero (the default value, as set in the
* NodeAttributes constructor). Hence, we assume that either ALL node radii are set, or NONE are.
*
* \todo There may be a better way of checking if node radii are set (#2694)
*/
std::map<unsigned, double> old_node_radius_map;
old_node_radius_map.clear();
if (this->mrMesh.GetNodeIteratorBegin()->HasNodeAttributes())
{
if (this->mrMesh.GetNodeIteratorBegin()->GetRadius() > 0.0)
{
for (typename AbstractMesh<ELEMENT_DIM, SPACE_DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
unsigned node_index = node_iter->GetIndex();
old_node_radius_map[node_index] = node_iter->GetRadius();
}
}
}
std::map<unsigned, c_vector<double, SPACE_DIM> > old_node_applied_force_map;
old_node_applied_force_map.clear();
if (output_node_velocities)
{
/*
* If outputting node velocities, we must keep a record of the applied force at each
* node, since this will be cleared during the remeshing process. We then restore
* these attributes to the nodes after calling ReMesh().
*/
for (typename AbstractMesh<ELEMENT_DIM, SPACE_DIM>::NodeIterator node_iter = this->mrMesh.GetNodeIteratorBegin();
node_iter != this->mrMesh.GetNodeIteratorEnd();
++node_iter)
{
unsigned node_index = node_iter->GetIndex();
old_node_applied_force_map[node_index] = node_iter->rGetAppliedForce();
}
}
NodeMap node_map(this->mrMesh.GetNumAllNodes());
// We must use a static_cast to call ReMesh() as this method is not defined in parent mesh classes
static_cast<MutableMesh<ELEMENT_DIM,SPACE_DIM>&>((this->mrMesh)).ReMesh(node_map);
if (!node_map.IsIdentityMap())
{
UpdateGhostNodesAfterReMesh(node_map);
// Update the mappings between cells and location indices
std::map<Cell*, unsigned> old_cell_location_map = this->mCellLocationMap;
// Remove any dead pointers from the maps (needed to avoid archiving errors)
this->mLocationCellMap.clear();
this->mCellLocationMap.clear();
for (std::list<CellPtr>::iterator it = this->mCells.begin(); it != this->mCells.end(); ++it)
{
unsigned old_node_index = old_cell_location_map[(*it).get()];
// This shouldn't ever happen, as the cell vector only contains living cells
assert(!node_map.IsDeleted(old_node_index));
unsigned new_node_index = node_map.GetNewIndex(old_node_index);
this->SetCellUsingLocationIndex(new_node_index,*it);
if (old_node_radius_map[old_node_index] > 0.0)
{
this->GetNode(new_node_index)->SetRadius(old_node_radius_map[old_node_index]);
}
if (output_node_velocities)
{
this->GetNode(new_node_index)->AddAppliedForceContribution(old_node_applied_force_map[old_node_index]);
}
}
this->Validate();
}
else
{
if (old_node_radius_map[this->mCellLocationMap[(*(this->mCells.begin())).get()]] > 0.0)
{
for (std::list<CellPtr>::iterator it = this->mCells.begin(); it != this->mCells.end(); ++it)
{
unsigned node_index = this->mCellLocationMap[(*it).get()];
this->GetNode(node_index)->SetRadius(old_node_radius_map[node_index]);
}
}
if (output_node_velocities)
{
for (std::list<CellPtr>::iterator it = this->mCells.begin(); it != this->mCells.end(); ++it)
{
unsigned node_index = this->mCellLocationMap[(*it).get()];
this->GetNode(node_index)->AddAppliedForceContribution(old_node_applied_force_map[node_index]);
}
}
}
// Purge any marked springs that are no longer springs
std::vector<const std::pair<CellPtr,CellPtr>*> springs_to_remove;
for (std::set<std::pair<CellPtr,CellPtr> >::iterator spring_it = this->mMarkedSprings.begin();
spring_it != this->mMarkedSprings.end();
++spring_it)
{
CellPtr p_cell_1 = spring_it->first;
CellPtr p_cell_2 = spring_it->second;
Node<SPACE_DIM>* p_node_1 = this->GetNodeCorrespondingToCell(p_cell_1);
Node<SPACE_DIM>* p_node_2 = this->GetNodeCorrespondingToCell(p_cell_2);
bool joined = false;
// For each element containing node1, if it also contains node2 then the cells are joined
std::set<unsigned> node2_elements = p_node_2->rGetContainingElementIndices();
for (typename Node<SPACE_DIM>::ContainingElementIterator elem_iter = p_node_1->ContainingElementsBegin();
elem_iter != p_node_1->ContainingElementsEnd();
++elem_iter)
{
if (node2_elements.find(*elem_iter) != node2_elements.end())
{
joined = true;
break;
}
}
// If no longer joined, remove this spring from the set
if (!joined)
{
springs_to_remove.push_back(&(*spring_it));
}
}
// Remove any springs necessary
for (std::vector<const std::pair<CellPtr,CellPtr>* >::iterator spring_it = springs_to_remove.begin();
spring_it != springs_to_remove.end();
++spring_it)
{
this->mMarkedSprings.erase(**spring_it);
}
// Tessellate if needed
TessellateIfNeeded();
static_cast<MutableMesh<ELEMENT_DIM,SPACE_DIM>&>((this->mrMesh)).SetMeshHasChangedSinceLoading();
}