SmallDeformationLocalAssemblerMatrix-impl.h

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#pragma once
 
#include <Eigen/Core>
#include <valarray>
#include <vector>
 
#include "IntegrationPointDataMatrix.h"
#include "MaterialLib/PhysicalConstant.h"
#include "MaterialLib/SolidModels/SelectSolidConstitutiveRelation.h"
#include "MathLib/LinAlg/Eigen/EigenMapTools.h"
#include "NumLib/Fem/InitShapeMatrices.h"
#include "NumLib/Fem/ShapeMatrixPolicy.h"
#include "ProcessLib/Deformation/BMatrixPolicy.h"
#include "ProcessLib/Deformation/LinearBMatrix.h"
#include "ProcessLib/LIE/SmallDeformation/SmallDeformationProcessData.h"
#include "SecondaryData.h"
#include "SmallDeformationLocalAssemblerInterface.h"
#include "SmallDeformationLocalAssemblerMatrix.h"
 
namespace ProcessLib
{
namespace LIE
{
namespace SmallDeformation
{
template <typename ShapeFunction, int DisplacementDim>
SmallDeformationLocalAssemblerMatrix<ShapeFunction, DisplacementDim>::
    SmallDeformationLocalAssemblerMatrix(
        MeshLib::Element const& e,
        std::size_t const /*local_matrix_size*/,
        NumLib::GenericIntegrationMethod const& integration_method,
        bool const is_axially_symmetric,
        SmallDeformationProcessData<DisplacementDim>& process_data)
    : _process_data(process_data),
      _integration_method(integration_method),
      _element(e),
      _is_axially_symmetric(is_axially_symmetric)
{
    unsigned const n_integration_points =
        _integration_method.getNumberOfPoints();
 
    _ip_data.reserve(n_integration_points);
    _secondary_data.N.resize(n_integration_points);
 
    auto const shape_matrices =
        NumLib::initShapeMatrices<ShapeFunction, ShapeMatricesType,
                                  DisplacementDim>(e, is_axially_symmetric,
                                                   _integration_method);
 
    auto& solid_material = MaterialLib::Solids::selectSolidConstitutiveRelation(
        _process_data.solid_materials, _process_data.material_ids, e.getID());
 
    for (unsigned ip = 0; ip < n_integration_points; ip++)
    {
        _ip_data.emplace_back(solid_material);
        auto& ip_data = _ip_data[ip];
        auto const& sm = shape_matrices[ip];
        ip_data.N = sm.N;
        ip_data.dNdx = sm.dNdx;
        ip_data.integration_weight =
            _integration_method.getWeightedPoint(ip).getWeight() *
            sm.integralMeasure * sm.detJ;
 
        // Initialize current time step values
        static const int kelvin_vector_size =
            MathLib::KelvinVector::kelvin_vector_dimensions(DisplacementDim);
        ip_data._sigma.setZero(kelvin_vector_size);
        ip_data._eps.setZero(kelvin_vector_size);
 
        // Previous time step values are not initialized and are set later.
        ip_data._sigma_prev.resize(kelvin_vector_size);
        ip_data._eps_prev.resize(kelvin_vector_size);
 
        ip_data._C.resize(kelvin_vector_size, kelvin_vector_size);
 
        _secondary_data.N[ip] = sm.N;
    }
}
 
template <typename ShapeFunction, int DisplacementDim>
void SmallDeformationLocalAssemblerMatrix<ShapeFunction, DisplacementDim>::
    assembleWithJacobian(double const t, double const dt,
                         std::vector<double> const& local_x,
                         std::vector<double> const& /*local_x_prev*/,
                         std::vector<double>& /*local_M_data*/,
                         std::vector<double>& /*local_K_data*/,
                         std::vector<double>& local_b_data,
                         std::vector<double>& local_Jac_data)
{
    assert(_element.getDimension() == DisplacementDim);
 
    auto const local_matrix_size = local_x.size();
 
    auto local_Jac = MathLib::createZeroedMatrix<StiffnessMatrixType>(
        local_Jac_data, local_matrix_size, local_matrix_size);
 
    auto local_b = MathLib::createZeroedVector<NodalDisplacementVectorType>(
        local_b_data, local_matrix_size);
 
    unsigned const n_integration_points =
        _integration_method.getNumberOfPoints();
 
    MPL::VariableArray variables;
    MPL::VariableArray variables_prev;
    ParameterLib::SpatialPosition x_position;
    x_position.setElementID(_element.getID());
 
    for (unsigned ip = 0; ip < n_integration_points; ip++)
    {
        x_position.setIntegrationPoint(ip);
        auto const& w = _ip_data[ip].integration_weight;
 
        auto const& N = _ip_data[ip].N;
        auto const& dNdx = _ip_data[ip].dNdx;
        auto const x_coord =
            NumLib::interpolateXCoordinate<ShapeFunction, ShapeMatricesType>(
                _element, N);
        auto const B =
            LinearBMatrix::computeBMatrix<DisplacementDim,
                                          ShapeFunction::NPOINTS,
                                          typename BMatricesType::BMatrixType>(
                dNdx, N, x_coord, _is_axially_symmetric);
 
        auto const& eps_prev = _ip_data[ip]._eps_prev;
        auto const& sigma_prev = _ip_data[ip]._sigma_prev;
 
        auto& eps = _ip_data[ip]._eps;
        auto& sigma = _ip_data[ip]._sigma;
        auto& state = _ip_data[ip]._material_state_variables;
 
        eps.noalias() =
            B * Eigen::Map<typename BMatricesType::NodalForceVectorType const>(
                    local_x.data(), ShapeFunction::NPOINTS * DisplacementDim);
 
        variables.mechanical_strain
            .emplace<MathLib::KelvinVector::KelvinVectorType<DisplacementDim>>(
                eps);
        variables_prev.stress
            .emplace<MathLib::KelvinVector::KelvinVectorType<DisplacementDim>>(
                sigma_prev);
        variables_prev.mechanical_strain
            .emplace<MathLib::KelvinVector::KelvinVectorType<DisplacementDim>>(
                eps_prev);
        variables_prev.temperature = _process_data._reference_temperature;
 
        auto&& solution = _ip_data[ip]._solid_material.integrateStress(
            variables_prev, variables, t, x_position, dt, *state);
 
        if (!solution)
        {
            OGS_FATAL("Computation of local constitutive relation failed.");
        }
 
        MathLib::KelvinVector::KelvinMatrixType<DisplacementDim> C;
        std::tie(sigma, state, C) = std::move(*solution);
 
        local_b.noalias() -= B.transpose() * sigma * w;
        local_Jac.noalias() += B.transpose() * C * B * w;
    }
}
 
template <typename ShapeFunction, int DisplacementDim>
void SmallDeformationLocalAssemblerMatrix<ShapeFunction, DisplacementDim>::
    computeSecondaryVariableConcreteWithVector(
        double const /*t*/, Eigen::VectorXd const& /*local_x*/)
{
    // Compute average value per element
    const int n = DisplacementDim == 2 ? 4 : 6;
    Eigen::VectorXd ele_stress = Eigen::VectorXd::Zero(n);
    Eigen::VectorXd ele_strain = Eigen::VectorXd::Zero(n);
 
    unsigned const n_integration_points =
        _integration_method.getNumberOfPoints();
    for (unsigned ip = 0; ip < n_integration_points; ip++)
    {
        auto const& ip_data = _ip_data[ip];
 
        ele_stress += ip_data._sigma;
        ele_strain += ip_data._eps;
    }
    ele_stress /= n_integration_points;
    ele_strain /= n_integration_points;
 
    (*_process_data._mesh_prop_stress_xx)[_element.getID()] = ele_stress[0];
    (*_process_data._mesh_prop_stress_yy)[_element.getID()] = ele_stress[1];
    (*_process_data._mesh_prop_stress_zz)[_element.getID()] = ele_stress[2];
    (*_process_data._mesh_prop_stress_xy)[_element.getID()] = ele_stress[3];
    if (DisplacementDim == 3)
    {
        (*_process_data._mesh_prop_stress_yz)[_element.getID()] = ele_stress[4];
        (*_process_data._mesh_prop_stress_xz)[_element.getID()] = ele_stress[5];
    }
 
    (*_process_data._mesh_prop_strain_xx)[_element.getID()] = ele_strain[0];
    (*_process_data._mesh_prop_strain_yy)[_element.getID()] = ele_strain[1];
    (*_process_data._mesh_prop_strain_zz)[_element.getID()] = ele_strain[2];
    (*_process_data._mesh_prop_strain_xy)[_element.getID()] = ele_strain[3];
    if (DisplacementDim == 3)
    {
        (*_process_data._mesh_prop_strain_yz)[_element.getID()] = ele_strain[4];
        (*_process_data._mesh_prop_strain_xz)[_element.getID()] = ele_strain[5];
    }
}
 
}  // namespace SmallDeformation
}  // namespace LIE
}  // namespace ProcessLib