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solid_mechanics_model_RVE.hh
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			/**
			* @file solid_mechanics_model_RVE.hh
			* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
			* @date Wed Jan 13 14:54:18 2016
			*
			* @brief SMM for RVE computations in FE2 simulations
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* Akantu is free software: you can redistribute it and/or modify it under the
			* terms of the GNU Lesser General Public License as published by the Free
			* Software Foundation, either version 3 of the License, or (at your option) any
			* later version.
			*
			* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
			* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
			* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
			* details.
			*
			* You should have received a copy of the GNU Lesser General Public License
			* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
			*
			*/

			/* -------------------------------------------------------------------------- */
			#ifndef __AKANTU_SOLID_MECHANICS_MODEL_RVE_HH__
			#define __AKANTU_SOLID_MECHANICS_MODEL_RVE_HH__


			/* -------------------------------------------------------------------------- */
			#include "solid_mechanics_model.hh"
			#include "aka_grid_dynamic.hh"
			#include <unordered_set>
			/* -------------------------------------------------------------------------- */

			__BEGIN_AKANTU__


			class SolidMechanicsModelRVE : public SolidMechanicsModel {

			/* ------------------------------------------------------------------------ */
			/* Constructors/Destructors */
			/* ------------------------------------------------------------------------ */

			public:
			SolidMechanicsModelRVE(Mesh & mesh, bool use_RVE_mat_selector = true,
			UInt spatial_dimension = _all_dimensions,
			const ID & id = "solid_mechanics_model",
			const MemoryID & memory_id = 0);

			virtual ~SolidMechanicsModelRVE();

			/* ------------------------------------------------------------------------ */
			/* Methods */
			/* ------------------------------------------------------------------------ */
			public:

			/// initialize completely the model
			virtual void initFull(const ModelOptions & options = SolidMechanicsModelOptions(_static, true));

			/// initialize the materials
			virtual void initMaterials();

			/// apply boundary contions based on macroscopic deformation gradient
			virtual void applyBoundaryConditions(const Matrix<Real> & displacement_gradient);

			/// advance the reactions -> grow gel and apply homogenized properties
			void advanceASR(const Matrix<Real> & prestrain);

			/// compute average stress or strain in the model
			Real averageTensorField(UInt row_index, UInt col_index, const ID & field_type);

			/// compute effective stiffness of the RVE
			void homogenizeStiffness(Matrix<Real> & C_macro);

			/// compute average eigenstrain
			void homogenizeEigenGradU(Matrix<Real> & eigen_gradu_macro);

			/// initialize the solver and the jacobian_matrix (called by initImplicit)
			virtual void initSolver(SolverOptions & options = _solver_no_options);

			/// allocate all vectors
			virtual void initArrays();

			/* ------------------------------------------------------------------------ */
			/* Data Accessor inherited members */
			/* ------------------------------------------------------------------------ */

			inline virtual void unpackData(CommunicationBuffer & buffer,
			const UInt index,
			SynchronizationTag tag);

			/* ------------------------------------------------------------------------ */
			/* Accessors */
			/* ------------------------------------------------------------------------ */
			public:

			AKANTU_GET_MACRO(CornerNodes, corner_nodes, const Array<UInt> &);
			AKANTU_GET_MACRO(Volume, volume, Real);

			private:

			/// find the corner nodes
			void findCornerNodes();

			/// perform virtual testing
			void performVirtualTesting(const Matrix<Real> & H, Matrix<Real> & eff_stresses, Matrix<Real> & eff_strains, const UInt test_no);

			/* ------------------------------------------------------------------------ */
			/* Members */
			/* ------------------------------------------------------------------------ */

			/// volume of the RVE
			Real volume;

			/// corner nodes 1, 2, 3, 4 (see Leonardo's thesis, page 98)
			Array<UInt> corner_nodes;

			/// bottom nodes
			std::unordered_set<UInt> bottom_nodes;

			/// left nodes
			std::unordered_set<UInt> left_nodes;

			/// standard mat selector or user one
			bool use_RVE_mat_selector;

			StaticCommunicator * static_communicator_dummy;
			};


			inline void SolidMechanicsModelRVE::unpackData(CommunicationBuffer & buffer,
			const UInt index,
			SynchronizationTag tag) {
			SolidMechanicsModel::unpackData(buffer, index, tag);

			if (tag == _gst_smm_uv) {
			Array<Real>::vector_iterator disp_it
			= displacement->begin(spatial_dimension);

			Vector<Real> current_disp(disp_it[index]);

			// if node is at the bottom, u_bottom = u_top +u_2 -u_3
			if ( bottom_nodes.count(index) ) {
			current_disp += Vector<Real>(disp_it[corner_nodes(1)]);
			current_disp -= Vector<Real>(disp_it[corner_nodes(2)]);
			}
			// if node is at the left, u_left = u_right +u_4 -u_3
			else if ( left_nodes.count(index) ) {
			current_disp += Vector<Real>(disp_it[corner_nodes(3)]);
			current_disp -= Vector<Real>(disp_it[corner_nodes(2)]);
			}
			}
			}

			/* -------------------------------------------------------------------------- */
			/* ASR material selector */
			/* -------------------------------------------------------------------------- */
			class GelMaterialSelector : public MeshDataMaterialSelector<std::string> {
			public:
			GelMaterialSelector(SolidMechanicsModel & model,
			const Real box_size,
			const std::string & gel_material,
			const UInt nb_gel_pockets,
			Real tolerance = 0.) :
			MeshDataMaterialSelector<std::string>("physical_names", model),
			model(model),
			gel_material(gel_material),
			nb_gel_pockets(nb_gel_pockets),
			nb_placed_gel_pockets(0),
			box_size(box_size) {

			Mesh & mesh = this->model.getMesh();
			UInt spatial_dimension = model.getSpatialDimension();

			const Vector<Real> & lower_bounds = mesh.getLowerBounds();
			const Vector<Real> & upper_bounds = mesh.getUpperBounds();

			Vector<Real> gcenter(spatial_dimension);
			for (UInt i = 0; i < spatial_dimension; ++i) {
			gcenter[i] = (upper_bounds[i] + lower_bounds[i]) / 2.;
			}

			Real grid_box_size = upper_bounds[0] - lower_bounds[0];
			Real grid_spacing = grid_box_size/7;
			Vector<Real> gspacing(spatial_dimension, grid_spacing);

			SpatialGrid<Element> grid(spatial_dimension, gspacing, gcenter);


			ElementType type = _triangle_3;
			GhostType ghost_type = _not_ghost;
			UInt nb_element = mesh.getNbElement(type, ghost_type);
			Element el;
			el.type = type;
			el.ghost_type = ghost_type;
			Array<Real> barycenter(0,2);
			barycenter.resize(nb_element);
			Array<Real>::vector_iterator bary_it = barycenter.begin(spatial_dimension);
			for (UInt elem = 0; elem < nb_element; ++bary_it, ++elem) {
			mesh.getBarycenter(elem, type, bary_it->storage(), ghost_type);
			el.element = elem;
			grid.insert(el, *bary_it);
			}

			/// generate the gel pockets
			srand(0.);
			Vector<Real> center(model.getSpatialDimension());
			for (UInt i = 0; i < this->nb_gel_pockets; ++i) {
			center.clear();
			center(0) = -box_size/2. + (box_size) * ((Real) rand() / (RAND_MAX));
			center(1) = -box_size/2. + (box_size) * ((Real) rand() / (RAND_MAX));
			Real min_dist = box_size;
			el.element = 0;
			bary_it = barycenter.begin(spatial_dimension);
			/// find cell in which current bary center lies
			SpatialGrid<Element>::CellID cell_id = grid.getCellID(center);
			SpatialGrid<Element>::Cell::const_iterator first_el =
			grid.beginCell(cell_id);
			SpatialGrid<Element>::Cell::const_iterator last_el =
			grid.endCell(cell_id);
			/// loop over all the elements in that cell
			for (;first_el != last_el; ++first_el){
			const Element & elem = *first_el;
			Vector<Real> bary = bary_it[elem.element];
			if (center.distance(bary) <= min_dist) {
			min_dist = center.distance(bary);
			el.element = elem.element;
			}
			}
			gel_pockets.push_back(el);
			}
			}

			UInt operator()(const Element & elem) {
			UInt temp_index = MeshDataMaterialSelector<std::string>::operator()(elem);
			if (temp_index == 1)
			return temp_index;
			std::vector<Element>::const_iterator iit = gel_pockets.begin();
			std::vector<Element>::const_iterator eit = gel_pockets.end();
			if(std::find(iit, eit, elem) != eit) {
			nb_placed_gel_pockets += 1;
			std::cout << nb_placed_gel_pockets << " gelpockets placed" << std::endl;
			return model.getMaterialIndex(gel_material);;
			}
			return 0;
			}


			protected:
			SolidMechanicsModel & model;
			std::string gel_material;
			std::vector<Element> gel_pockets;
			UInt nb_gel_pockets;
			UInt nb_placed_gel_pockets;
			Real box_size;
			};


			__END_AKANTU__


			///#include "material_selector_tmpl.hh"

			#endif /* __AKANTU_SOLID_MECHANICS_MODEL_RVE_HH__ */

rAKA/src/material_FE2/solid_mechanics_model_RVE.hh0cfe38a37116bugfixes/43-documentati…

solid_mechanics_model_RVE.hhView Options

rAKA/src/material_FE2/solid_mechanics_model_RVE.hh
0cfe38a37116bugfixes/43-documentati…

solid_mechanics_model_RVE.hh
View Options