structural_mechanics_model_boundary.cc
70e9458bbd95master

structural_mechanics_model_boundary.cc
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			/**
			* @file structural_mechanics_model_boundary.cc
			* @author Fabian Barras <fabian.barras@epfl.ch>
			* @date Wed May 25 15:21:50 2011
			*
			* @brief
			*
			* @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/>.
			*
			*/

			/* -------------------------------------------------------------------------- */
			#include "model.hh"
			#include "structural_mechanics_model.hh"
			/* -------------------------------------------------------------------------- */

			__BEGIN_AKANTU__

			/* -------------------------------------------------------------------------- */
			/**
			* @param myf pointer to a function that fills a vector/tensor with respect to
			* passed coordinates
			*/
			void StructuralMechanicsModel::computeForcesFromFunction(BoundaryFunction myf,
			BoundaryFunctionType function_type){
			/** function type is
			** _bft_forces : linear load is given
			** _bft_stress : stress function is given -> Not already done for this kind of model
			*/

			std::stringstream name;
			name << id << ":structuralmechanics:imposed_linear_load";
			Vector<Real> lin_load(0, nb_degre_of_freedom,name.str());
			name.clear();
			name << id << ":structuralmechanics:imposed_stresses";
			Vector<Real> stress_funct(0, nb_degre_of_freedom*nb_degre_of_freedom,name.str());
			name.clear();
			name << id << ":structuralmechanics:quad_coords";
			Vector<Real> quad_coords(0,spatial_dimension,"quad_coords");

			UInt offset = 0;
			switch(function_type) {
			case _bft_stress:
			offset = nb_degre_of_freedom * nb_degre_of_freedom; break;
			case _bft_forces:
			offset = nb_degre_of_freedom; break;
			}

			//prepare the loop over element types
			const ElementType type = _bernoulli_beam_2;
			UInt nb_quad = getFEM().getNbQuadraturePoints(type);
			UInt nb_element = getFEM().getMesh().getNbElement(type);
			getFEMClass<MyFEMType>().getShapeFunctions().interpolateOnControlPoints<type>(getFEM().getMesh().getNodes(),
			quad_coords,
			spatial_dimension);
			getFEMClass<MyFEMType>().getShapeFunctions().interpolateOnControlPoints<type>(getFEM().getMesh().getNodes(),
			quad_coords,
			spatial_dimension,
			_not_ghost,
			NULL,
			true,
			0,
			1,
			1);

			Real * imposed_val = NULL;
			switch(function_type) {
			case _bft_stress:
			stress_funct.resize(nb_element*nb_quad);
			imposed_val = stress_funct.values;
			break;
			case _bft_forces:
			lin_load.resize(nb_element*nb_quad);
			imposed_val = lin_load.values;
			break;
			}

			/// sigma/load on each quadrature points
			Real * qcoord = quad_coords.values;
			for (UInt el = 0; el < nb_element; ++el) {
			for (UInt q = 0; q < nb_quad; ++q) {
			myf(qcoord, imposed_val, NULL, 0);
			imposed_val += offset;
			qcoord += spatial_dimension;
			}
			}

			switch(function_type) {
			case _bft_stress:
			computeForcesByStressTensor(stress_funct,(type)); break;
			case _bft_forces:
			computeForcesByTractionVector(lin_load,(type)); break;
			}
			}


			/* -------------------------------------------------------------------------- */
			void StructuralMechanicsModel::computeForcesByTractionVector(const Vector<Real> & tractions,
			const ElementType & type){
			AKANTU_DEBUG_IN();
			MyFEMType & fem = getFEMClass<MyFEMType>();
			UInt nb_element = getFEM().getMesh().getNbElement(type);
			UInt nb_nodes_per_element = getFEM().getMesh().getNbNodesPerElement(type);
			UInt nb_quad = getFEM().getNbQuadraturePoints(type);

			// check dimension match
			AKANTU_DEBUG_ASSERT(Mesh::getSpatialDimension(type) == getFEM().getElementDimension(),
			"element type dimension does not match the dimension of boundaries : " <<
			getFEM().getElementDimension() << " != " <<
			Mesh::getSpatialDimension(type));

			// check size of the vector
			AKANTU_DEBUG_ASSERT(tractions.getSize() == nb_quad*nb_element,
			"the size of the vector should be the total number of quadrature points");

			// check number of components
			AKANTU_DEBUG_ASSERT(tractions.getNbComponent() == nb_degre_of_freedom,
			"the number of components should be the spatial dimension of the problem");


			Vector<Real> funct(nb_element * nb_quad, nb_degre_of_freedom * nb_nodes_per_element);

			const Vector<Real> & N0 = fem.getShapeFunctions().getShapes(_bernoulli_beam_2, _not_ghost, 0);
			const Vector<Real> & M0 = fem.getShapeFunctions().getShapes(_bernoulli_beam_2, _not_ghost, 1);
			const Vector<Real> & L0 = fem.getShapeFunctions().getShapes(_bernoulli_beam_2, _not_ghost, 2);
			const Vector<Real> & Mp = fem.getShapeFunctions().getShapes(_bernoulli_beam_2, _not_ghost, 3);
			const Vector<Real> & Lp = fem.getShapeFunctions().getShapes(_bernoulli_beam_2, _not_ghost, 4);


			// Vector<Real> n (nb_degre_of_freedom * nb_nodes_per_element, nb_degre_of_freedom);
			funct.clear();

			Real * N0_val = N0.values;
			Real * M0_val = M0.values;
			Real * L0_val = L0.values;
			Real * Mp_val = Mp.values;
			Real * Lp_val = Lp.values;

			types::Matrix N(nb_degre_of_freedom , nb_degre_of_freedom * nb_nodes_per_element);
			Vector<Real>::iterator< types::RVector> Nt_T = funct.begin(nb_degre_of_freedom * nb_nodes_per_element);
			Vector<Real>::iterator<types::RVector> T = const_cast< Vector<Real> &>(tractions).begin(nb_degre_of_freedom);

			for (UInt e = 0; e < nb_element; ++e) {
			for (UInt q = 0; q < nb_quad; ++q) {
			N.clear();
			N(0,0) = N0_val[0];
			N(0,3) = N0_val[1];

			N(1,1) = M0_val[0];
			N(1,2) = L0_val[0];
			N(1,4) = M0_val[1];
			N(1,5) = L0_val[1];

			N(2,1) = Mp_val[0];
			N(2,2) = Lp_val[0];
			N(2,4) = Mp_val[1];
			N(2,5) = Lp_val[1];

			Nt_T->mul<true>(N, *T);

			++Nt_T;

			N0_val += nb_nodes_per_element;
			M0_val += nb_nodes_per_element;
			L0_val += nb_nodes_per_element;
			Mp_val += nb_nodes_per_element;
			Lp_val += nb_nodes_per_element;
			++T;
			}

			}

			// allocate the vector that will contain the integrated values
			std::stringstream name;
			name << id << ":solidmechanics:" << type << ":integral_boundary";
			Vector<Real> int_funct(nb_element, nb_degre_of_freedom*nb_nodes_per_element,name.str());
			//do the integration
			getFEM().integrate(funct, int_funct, nb_degre_of_freedom*nb_nodes_per_element, type);
			// assemble the result into force vector
			getFEM().assembleVector(int_funct,*force_momentum,
			dof_synchronizer->getLocalDOFEquationNumbers(),
			nb_degre_of_freedom, type);
			AKANTU_DEBUG_OUT();
			}
			/* -------------------------------------------------------------------------- */
			void StructuralMechanicsModel::computeForcesByStressTensor(const Vector<Real> & stresses,
			const ElementType & type){
			AKANTU_DEBUG_IN();
			/**
			UInt nb_element = getFEMBoundary().getMesh().getNbElement(type);
			UInt nb_quad = getFEMBoundary().getNbQuadraturePoints(type);

			// check dimension match
			AKANTU_DEBUG_ASSERT(Mesh::getSpatialDimension(type) == getFEMBoundary().getElementDimension(),
			"element type dimension does not match the dimension of boundaries : " <<
			getFEMBoundary().getElementDimension() << " != " <<
			Mesh::getSpatialDimension(type));

			// check size of the vector
			AKANTU_DEBUG_ASSERT(stresses.getSize() == nb_quad*nb_element,
			"the size of the vector should be the total number of quadrature points");

			// check number of components
			AKANTU_DEBUG_ASSERT(stresses.getNbComponent() == spatial_dimension*spatial_dimension,
			"the number of components should be the dimension of 2-tensors");



			std::stringstream name;
			name << id << ":solidmechanics:" << type << ":traction_boundary";
			Vector<Real> funct(nb_element*nb_quad, spatial_dimension,name.str());
			const Vector<Real> & normals_on_quad = getFEMBoundary().getNormalsOnQuadPoints(type);

			Math::matrix_vector(spatial_dimension,spatial_dimension,stresses,normals_on_quad,funct);
			computeForcesByTractionVector(funct,type);
			*/

			AKANTU_DEBUG_OUT();
			}


			__END_AKANTU__

rAKA/model/structural_mechanics/structural_mechanics_model_boundary.cc70e9458bbd95master

structural_mechanics_model_boundary.ccView Options

rAKA/model/structural_mechanics/structural_mechanics_model_boundary.cc
70e9458bbd95master

structural_mechanics_model_boundary.cc
View Options