Bilaplacian.hpp

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#pragma once
 
#include <polyfem/assembler/Assembler.hpp>
#include <polyfem/utils/AutodiffTypes.hpp>
 
namespace polyfem::assembler
{
    // local assembler for bilaplacian, see laplacian
    //  0 L
    //  L M
    class BilaplacianMain : public LinearAssembler
    {
    public:
        using LinearAssembler::assemble;
 
        Eigen::Matrix<double, Eigen::Dynamic, 1, 0, 9, 1>
        assemble(const LinearAssemblerData &data) const override
        {
            return Eigen::Matrix<double, 1, 1>::Zero(1, 1);
        }
 
        std::string name() const override { return "Bilaplacian"; }
        std::map<std::string, ParamFunc> parameters() const override { return std::map<std::string, ParamFunc>(); }
    };
 
    class BilaplacianMixed : public MixedAssembler
    {
    public:
        std::string name() const override { return "BilaplacianMixed"; }
 
        using MixedAssembler::assemble;
 
        // res is R
        Eigen::Matrix<double, Eigen::Dynamic, 1, 0, 3, 1>
        assemble(const MixedAssemblerData &data) const override;
 
        inline int rows() const override { return 1; }
        inline int cols() const override { return 1; }
    };
 
    class BilaplacianAux : public LinearAssembler
    {
    public:
        using LinearAssembler::assemble;
 
        // res is R
        Eigen::Matrix<double, Eigen::Dynamic, 1, 0, 9, 1>
        assemble(const LinearAssemblerData &data) const override;
 
        std::string name() const override { return "BilaplacianAux"; }
        std::map<std::string, ParamFunc> parameters() const override { return std::map<std::string, ParamFunc>(); }
    };
} // namespace polyfem::assembler