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diffusion_law.cc
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Tue, May 28, 04:59

diffusion_law.cc
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#include "diffusion_law.hh"
#include "heat_transfer_model.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
DiffusionLaw::DiffusionLaw(DiffusionModel & model, const ID & id,
const ID & fe_engine_id)
: Parent(model, id, model.getSpatialDimension(), _ek_regular, fe_engine_id),
grad_u(registerInternal("∇u", model.getSpatialDimension(), fe_engine_id)),
d_grad_u(
registerInternal("D∇u", model.getSpatialDimension(), fe_engine_id)),
diffusivity(registerInternal("diffusivity",
model.getSpatialDimension() *
model.getSpatialDimension(),
fe_engine_id)) {}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::computeGradU(ElementType type, GhostType ghost_type) {
if (grad_u.getRelease(type, ghost_type) != -1 and
grad_u.getRelease(type, ghost_type) ==
getHandler().getDiffusionRelease()) {
return;
}
auto & elem_filter = getElementFilter(type, ghost_type);
this->getFEEngine().gradientOnIntegrationPoints(
getHandler().getDiffusion(), grad_u(type, ghost_type), 1, type,
ghost_type, elem_filter);
grad_u.getRelease(type, ghost_type) = getHandler().getDiffusionRelease();
}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::computeDiffusivityGradU(GhostType ghost_type) {
auto dim = getHandler().getSpatialDimension();
for (auto && type : getElementFilter().elementTypes(dim, ghost_type)) {
this->computeGradU(type, ghost_type);
this->computeDiffusivityGradUOnQuadPoints(type, ghost_type);
}
}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::assembleInternalFlow(GhostType ghost_type) {
auto && model = this->getHandler();
auto dim = model.getSpatialDimension();
auto & fem = getFEEngine();
for (auto && type : getElementFilter().elementTypes(dim, ghost_type)) {
auto && elem_filter = getElementFilter(type, ghost_type);
auto nb_element = elem_filter.size();
if (nb_element == 0) {
return;
}
auto nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
auto & d_gradu_vect = d_grad_u(type, ghost_type);
auto nb_quad_points = d_grad_u.size();
Array<Real> bt_d_gu(nb_quad_points, nb_nodes_per_element);
fem.computeBtD(d_gradu_vect, bt_d_gu, type, ghost_type);
Array<Real> int_bt_d_gu(nb_element, nb_nodes_per_element);
fem.integrate(bt_d_gu, int_bt_d_gu, nb_nodes_per_element, type, ghost_type,
elem_filter);
model.getDOFManager().assembleElementalArrayLocalArray(
int_bt_d_gu, model.getInternalFlow(), type, ghost_type, -1,
elem_filter);
}
}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::assembleDiffusivityMatrix() {
auto & fem = this->getFEEngine();
auto & model = this->getHandler();
for (auto && type : getElementFilter().elementTypes(spatial_dimension)) {
auto && elem_filter = getElementFilter(type, _not_ghost);
auto nb_element = elem_filter.size();
if (nb_element == 0) {
return;
}
auto nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
auto nb_quadrature_points = fem.getNbIntegrationPoints(type);
auto bt_d_b = std::make_unique<Array<Real>>(
nb_element * nb_quadrature_points,
nb_nodes_per_element * nb_nodes_per_element, "B^t*D*B");
fem.computeBtDB(diffusivity(type), *bt_d_b, 2, type, _not_ghost,
elem_filter);
/// compute @f$ k_e = \int_e \mathbf{B}^t * \mathbf{D} * \mathbf{B}@f$
auto K_e = std::make_unique<Array<Real>>(
nb_element, nb_nodes_per_element * nb_nodes_per_element, "K_e");
fem.integrate(*bt_d_b, *K_e, nb_nodes_per_element * nb_nodes_per_element,
type, _not_ghost, elem_filter);
model.getDOFManager().assembleElementalMatricesToMatrix(
"K", model.getDOFName(), *K_e, type, _not_ghost, _symmetric,
elem_filter);
}
}
/* -------------------------------------------------------------------------- */
Int DiffusionLaw::getNbData(const Array<Element> & elements,
const SynchronizationTag & tag) const {
AKANTU_DEBUG_IN();
Int size = 0;
switch (tag) {
case SynchronizationTag::_diffusion_gradient: {
// temperature gradient
size += getHandler().getNbIntegrationPoints(elements) * spatial_dimension *
Int(sizeof(Real));
break;
}
default: {
AKANTU_ERROR("Unknown ghost synchronization tag : " << tag);
}
}
AKANTU_DEBUG_OUT();
return size;
}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::packData(CommunicationBuffer & buffer,
const Array<Element> & elements,
const SynchronizationTag & tag) const {
switch (tag) {
case SynchronizationTag::_diffusion_gradient: {
packElementalDataHelper(this->grad_u, buffer, elements,
this->getFEEngine());
break;
}
default: {
AKANTU_ERROR("Unknown ghost synchronization tag : " << tag);
}
}
}
/* -------------------------------------------------------------------------- */
void DiffusionLaw::unpackData(CommunicationBuffer & buffer,
const Array<Element> & elements,
const SynchronizationTag & tag) {
switch (tag) {
case SynchronizationTag::_diffusion_gradient: {
unpackElementalDataHelper(grad_u, buffer, elements, getFEEngine());
break;
}
default: {
AKANTU_ERROR("Unknown ghost synchronization tag : " << tag);
}
}
}
/* -------------------------------------------------------------------------- */
DiffusionFactory & DiffusionLaw::getFactory() {
return DiffusionFactory::getInstance();
}
} // namespace akantu

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