MooneyRivlin3ParamSymbolic.hpp

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#pragma once
 
#include <polyfem/assembler/Assembler.hpp>
#include <polyfem/assembler/MatParams.hpp>
#include <polyfem/utils/AutodiffTypes.hpp>
#include <polyfem/utils/ElasticityUtils.hpp>
 
// non linear NeoHookean material model
namespace polyfem::assembler
{
    template <typename T>
    using AutoDiffGradMat = Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic, 0, 3, 3>;
    template <typename T>
    using AutoDiffVect = Eigen::Matrix<T, Eigen::Dynamic, 1>;
 
    class MooneyRivlin3ParamSymbolic : public NLAssembler, public ElasticityAssembler
    {
    public:
        MooneyRivlin3ParamSymbolic();
 
        using NLAssembler::assemble_energy;
        using NLAssembler::assemble_gradient;
        using NLAssembler::assemble_hessian;
 
        const GenericMatParam &c1() const { return c1_; }
        const GenericMatParam &c2() const { return c2_; }
        const GenericMatParam &c3() const { return c3_; }
        const GenericMatParam &d1() const { return d1_; }
 
        // energy, gradient, and hessian used in newton method
        double compute_energy(const NonLinearAssemblerData &data) const override;
        Eigen::VectorXd assemble_gradient(const NonLinearAssemblerData &data) const override;
        Eigen::MatrixXd assemble_hessian(const NonLinearAssemblerData &data) const override;
 
        // sets material params
        void add_multimaterial(const int index, const json &params, const Units &units) override;
 
        std::string name() const override { return "MooneyRivlin3ParamSymbolic"; }
        std::map<std::string, ParamFunc> parameters() const override;
 
        void assign_stress_tensor(const OutputData &data,
                                  const int all_size,
                                  const ElasticityTensorType &type,
                                  Eigen::MatrixXd &all,
                                  const std::function<Eigen::MatrixXd(const Eigen::MatrixXd &)> &fun) const override;
 
        void compute_stress_grad_multiply_mat(const OptAssemblerData &data,
                                              const Eigen::MatrixXd &mat,
                                              Eigen::MatrixXd &stress,
                                              Eigen::MatrixXd &result) const override;
 
        void compute_stress_grad_multiply_stress(const OptAssemblerData &data,
                                                 Eigen::MatrixXd &stress,
                                                 Eigen::MatrixXd &result) const override;
 
        void compute_stress_grad_multiply_vect(const OptAssemblerData &data,
                                               const Eigen::MatrixXd &vect,
                                               Eigen::MatrixXd &stress,
                                               Eigen::MatrixXd &result) const override;
 
    private:
        GenericMatParam c1_;
        GenericMatParam c2_;
        GenericMatParam c3_;
        GenericMatParam d1_;
 
        // utility function that computes energy, the template is used for double, DScalar1, and DScalar2 in energy, gradient and hessian
        template <typename T>
        T compute_energy_aux(const NonLinearAssemblerData &data) const;
        template <int n_basis, int dim>
        void compute_energy_hessian_aux_fast(const NonLinearAssemblerData &data, Eigen::MatrixXd &H) const;
        template <int n_basis, int dim>
        void compute_energy_aux_gradient_fast(const NonLinearAssemblerData &data, Eigen::VectorXd &G_flattened) const;
 
        template <typename T>
        T elastic_energy(const RowVectorNd &p, const int el_id, const AutoDiffGradMat<T> &def_grad) const;
 
        void get_grad_hess_symbolic(const double c1, const double c2, const double c3, const double d1, const Eigen::MatrixXd &def_grad, Eigen::MatrixXd &grad, Eigen::MatrixXd &hess) const;
        void get_grad_hess_autodiff(const double c1, const double c2, const double c3, const double d1, const Eigen::MatrixXd &global_pts, const int el_id, const Eigen::MatrixXd &F, Eigen::MatrixXd &grad, Eigen::MatrixXd &hess) const;
    };
} // namespace polyfem::assembler