threed_beam_fea.h

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// Copyright 2015. All rights reserved.
//
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//   this list of conditions and the following disclaimer.
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// Author: ryan.latture@gmail.com (Ryan Latture)

#ifndef THREED_BEAM_FEA_H
#define THREED_BEAM_FEA_H

#ifdef EIGEN_USE_MKL_ALL
#include <Eigen/PardisoSupport>
#else

#include <Eigen/SparseLU>

#endif

#include <Eigen/Core>
#include <Eigen/Geometry>
#include <Eigen/SparseCore>

#include <chrono>
#include <cmath>
#include <iostream>
#include <limits>

#include "containers.h"
#include "options.h"
#include "summary.h"
#include "csv_parser.h"

namespace fea {

    typedef Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic> GlobalStiffMatrix;

    typedef Eigen::Matrix<double, 12, 12, Eigen::RowMajor> LocalMatrix;

    typedef Eigen::Matrix<double, Eigen::Dynamic, 1> ForceVector;

    typedef Eigen::SparseMatrix<double> SparseMat;

    inline double norm(const Node &n1, const Node &n2);

    class GlobalStiffAssembler {

    public:

        GlobalStiffAssembler() {
            Kelem.setZero();
            Klocal.setZero();
            Aelem.setZero();
            AelemT.setZero();
            SparseKelem.resize(12, 12);
            SparseKelem.reserve(40);
        };

        void operator()(SparseMat &Kg, const Job &job, const std::vector<Tie> &ties);

        void calcKelem(unsigned int i, const Job &job);

        void calcAelem(const Eigen::Vector3d &nx, const Eigen::Vector3d &nz);

        LocalMatrix getKelem() {
            return Kelem;
        }

        LocalMatrix getAelem() {
            return Aelem;
        }

    private:
        LocalMatrix Kelem;
        LocalMatrix Klocal;
        LocalMatrix Aelem;
        LocalMatrix AelemT;
        SparseMat SparseKelem;
    };

    void loadBCs(SparseMat &Kg, ForceVector &force_vec, const std::vector<BC> &BCs, unsigned int num_nodes);

    void loadTies(std::vector<Eigen::Triplet<double> > &triplets, const std::vector<Tie> &ties);


    std::vector<std::vector<double> > computeTieForces(const std::vector<Tie> &ties,
                                                       const std::vector<std::vector<double> > &nodal_displacements);

    void loadForces(SparseMat &force_vec, const std::vector<Force> &forces);

    Summary solve(const Job &job,
                  const std::vector<BC> &BCs,
                  const std::vector<Force> &forces,
                  const std::vector<Tie> &ties,
                  const Options &options);
} // namespace fea

#endif // THREED_BEAM_FEA_H