void ContactMaster::updateContactSet(bool beginning_of_step) { std::map<dof_id_type, PenetrationInfo *>::iterator it = _penetration_locator._penetration_info.begin(), end = _penetration_locator._penetration_info.end(); for (; it!=end; ++it) { const dof_id_type slave_node_num = it->first; PenetrationInfo * pinfo = it->second; // Skip this pinfo if there are no DOFs on this node. if ( ! pinfo || pinfo->_node->n_comp(_sys.number(), _vars(_component)) < 1 ) continue; if (beginning_of_step) { pinfo->_locked_this_step = 0; pinfo->_starting_elem = it->second->_elem; pinfo->_starting_side_num = it->second->_side_num; pinfo->_starting_closest_point_ref = it->second->_closest_point_ref; pinfo->_contact_force_old = pinfo->_contact_force; pinfo->_accumulated_slip_old = pinfo->_accumulated_slip; pinfo->_frictional_energy_old = pinfo->_frictional_energy; } const Real contact_pressure = -(pinfo->_normal * pinfo->_contact_force) / nodalArea(*pinfo); const Real distance = pinfo->_normal * (pinfo->_closest_point - _mesh.node(slave_node_num)); // Capture if ( ! pinfo->isCaptured() && MooseUtils::absoluteFuzzyGreaterEqual(distance, 0, _capture_tolerance)) { pinfo->capture(); // Increment the lock count every time the node comes back into contact from not being in contact. if (_formulation == CF_KINEMATIC) ++pinfo->_locked_this_step; } // Release else if (_model != CM_GLUED && pinfo->isCaptured() && _tension_release >= 0 && -contact_pressure >= _tension_release && pinfo->_locked_this_step < 2) { pinfo->release(); pinfo->_contact_force.zero(); } if (_formulation == CF_AUGMENTED_LAGRANGE && pinfo->isCaptured()) pinfo->_lagrange_multiplier -= getPenalty(*pinfo) * distance; } }
void ContactMaster::addPoints() { _point_to_info.clear(); std::map<dof_id_type, PenetrationInfo *>::iterator it = _penetration_locator._penetration_info.begin(), end = _penetration_locator._penetration_info.end(); for (; it!=end; ++it) { PenetrationInfo * pinfo = it->second; // Skip this pinfo if there are no DOFs on this node. if ( ! pinfo || pinfo->_node->n_comp(_sys.number(), _vars(_component)) < 1 ) continue; if ( pinfo->isCaptured() ) { addPoint(pinfo->_elem, pinfo->_closest_point); _point_to_info[pinfo->_closest_point] = pinfo; computeContactForce(pinfo); } } }
void SlaveConstraint::addPoints() { _point_to_info.clear(); std::map<dof_id_type, PenetrationInfo *>::iterator it = _penetration_locator._penetration_info.begin(), end = _penetration_locator._penetration_info.end(); const auto & node_to_elem_map = _mesh.nodeToElemMap(); for (; it != end; ++it) { PenetrationInfo * pinfo = it->second; // Skip this pinfo if there are no DOFs on this node. if (!pinfo || pinfo->_node->n_comp(_sys.number(), _vars[_component]) < 1) continue; dof_id_type slave_node_num = it->first; const Node * node = pinfo->_node; if (pinfo->isCaptured() && node->processor_id() == processor_id()) { // Find an element that is connected to this node that and that is also on this processor auto node_to_elem_pair = node_to_elem_map.find(slave_node_num); mooseAssert(node_to_elem_pair != node_to_elem_map.end(), "Missing node in node to elem map"); const std::vector<dof_id_type> & connected_elems = node_to_elem_pair->second; Elem * elem = NULL; for (unsigned int i = 0; i < connected_elems.size() && !elem; ++i) { Elem * cur_elem = _mesh.elemPtr(connected_elems[i]); if (cur_elem->processor_id() == processor_id()) elem = cur_elem; } mooseAssert(elem, "Couldn't find an element on this processor that is attached to the slave node!"); addPoint(elem, *node); _point_to_info[*node] = pinfo; } } }
unsigned int FrictionalContactProblem::numLocalFrictionalConstraints() { GeometricSearchData & displaced_geom_search_data = getDisplacedProblem()->geomSearchData(); std::map<std::pair<unsigned int, unsigned int>, PenetrationLocator *> * penetration_locators = &displaced_geom_search_data._penetration_locators; unsigned int num_constraints(0); for (std::map<std::pair<unsigned int, unsigned int>, PenetrationLocator *>::iterator plit = penetration_locators->begin(); plit != penetration_locators->end(); ++plit) { PenetrationLocator & pen_loc = *plit->second; bool frictional_contact_this_interaction = false; std::map<std::pair<int,int>,InteractionParams>::iterator ipit; std::pair<int,int> ms_pair(pen_loc._master_boundary,pen_loc._slave_boundary); ipit = _interaction_params.find(ms_pair); if (ipit != _interaction_params.end()) frictional_contact_this_interaction = true; if (frictional_contact_this_interaction) { std::vector<dof_id_type> & slave_nodes = pen_loc._nearest_node._slave_nodes; for (unsigned int i=0; i<slave_nodes.size(); i++) { dof_id_type slave_node_num = slave_nodes[i]; PenetrationInfo * pinfo = pen_loc._penetration_info[slave_node_num]; if (pinfo) if (pinfo->isCaptured()) ++num_constraints; } } } return num_constraints; }
bool MechanicalContactConstraint::shouldApply() { bool in_contact = false; std::map<dof_id_type, PenetrationInfo *>::iterator found = _penetration_locator._penetration_info.find(_current_node->id()); if ( found != _penetration_locator._penetration_info.end() ) { PenetrationInfo * pinfo = found->second; if ( pinfo != NULL && pinfo->isCaptured() ) { in_contact = true; // This does the contact force once per constraint, rather than once per quad point and for // both master and slave cases. computeContactForce(pinfo); } } return in_contact; }
Real PenetrationAux::computeValue() { const Node * current_node = NULL; if (_nodal) current_node = _current_node; else current_node = _mesh.getQuadratureNode(_current_elem, _current_side, _qp); PenetrationInfo * pinfo = _penetration_locator._penetration_info[current_node->id()]; Real retVal(NotPenetrated); if (pinfo) switch (_quantity) { case PA_DISTANCE: retVal = pinfo->_distance; break; case PA_TANG_DISTANCE: retVal = pinfo->_tangential_distance; break; case PA_NORMAL_X: retVal = pinfo->_normal(0); break; case PA_NORMAL_Y: retVal = pinfo->_normal(1); break; case PA_NORMAL_Z: retVal = pinfo->_normal(2); break; case PA_CLOSEST_POINT_X: retVal = pinfo->_closest_point(0); break; case PA_CLOSEST_POINT_Y: retVal = pinfo->_closest_point(1); break; case PA_CLOSEST_POINT_Z: retVal = pinfo->_closest_point(2); break; case PA_ELEM_ID: retVal = static_cast<Real>(pinfo->_elem->id() + 1); break; case PA_SIDE: retVal = static_cast<Real>(pinfo->_side_num); break; case PA_INCREMENTAL_SLIP_MAG: retVal = pinfo->isCaptured() ? pinfo->_incremental_slip.norm() : 0; break; case PA_INCREMENTAL_SLIP_X: retVal = pinfo->isCaptured() ? pinfo->_incremental_slip(0) : 0; break; case PA_INCREMENTAL_SLIP_Y: retVal = pinfo->isCaptured() ? pinfo->_incremental_slip(1) : 0; break; case PA_INCREMENTAL_SLIP_Z: retVal = pinfo->isCaptured() ? pinfo->_incremental_slip(2) : 0; break; case PA_ACCUMULATED_SLIP: retVal = pinfo->_accumulated_slip; break; case PA_FORCE_X: retVal = pinfo->_contact_force(0); break; case PA_FORCE_Y: retVal = pinfo->_contact_force(1); break; case PA_FORCE_Z: retVal = pinfo->_contact_force(2); break; case PA_NORMAL_FORCE_MAG: retVal = -pinfo->_contact_force * pinfo->_normal; break; case PA_NORMAL_FORCE_X: retVal = (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(0); break; case PA_NORMAL_FORCE_Y: retVal = (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(1); break; case PA_NORMAL_FORCE_Z: retVal = (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(2); break; case PA_TANGENTIAL_FORCE_MAG: { RealVectorValue contact_force_normal((pinfo->_contact_force * pinfo->_normal) * pinfo->_normal); RealVectorValue contact_force_tangential(pinfo->_contact_force - contact_force_normal); retVal = contact_force_tangential.norm(); break; } case PA_TANGENTIAL_FORCE_X: retVal = pinfo->_contact_force(0) - (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(0); break; case PA_TANGENTIAL_FORCE_Y: retVal = pinfo->_contact_force(1) - (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(1); break; case PA_TANGENTIAL_FORCE_Z: retVal = pinfo->_contact_force(2) - (pinfo->_contact_force * pinfo->_normal) * pinfo->_normal(2); break; case PA_FRICTIONAL_ENERGY: retVal = pinfo->_frictional_energy; break; case PA_LAGRANGE_MULTIPLIER: retVal = pinfo->_lagrange_multiplier; break; case PA_MECH_STATUS: retVal = pinfo->_mech_status; break; default: mooseError("Unknown PA_ENUM"); } // switch return retVal; }