StateSolve.cpp

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#include <polyfem/State.hpp>
 
#include <polyfem/io/MatrixIO.hpp>
#include <polyfem/utils/Timer.hpp>
 
namespace polyfem
{
    using namespace assembler;
    using namespace io;
    using namespace utils;
 
    void State::init_solve(Eigen::MatrixXd &sol, Eigen::MatrixXd &pressure)
    {
        POLYFEM_SCOPED_TIMER("Setup RHS");
 
        solve_data.rhs_assembler = build_rhs_assembler();
 
        initial_solution(sol);
        if (sol.cols() > 1) // ignore previous solutions
            sol.conservativeResize(Eigen::NoChange, 1);
 
        if (mixed_assembler != nullptr)
        {
            const int actual_dim = problem->is_scalar() ? 1 : mesh->dimension();
 
            pressure.resize(0, 0);
            sol.conservativeResize(rhs.size(), sol.cols());
            // Zero initial pressure
            sol.middleRows(n_bases * actual_dim, n_pressure_bases).setZero();
            sol(sol.size() - 1) = 0;
 
            sol_to_pressure(sol, pressure);
        }
 
        if (problem->is_time_dependent())
            save_timestep(0, 0, 0, 0, sol, pressure);
    }
 
    namespace
    {
        bool read_initial_x_from_file(
            const std::string &state_path,
            const std::string &x_name,
            const bool reorder,
            const Eigen::VectorXi &in_node_to_node,
            const int dim,
            Eigen::MatrixXd &x)
        {
            if (state_path.empty())
                return false;
 
            if (!read_matrix(state_path, x_name, x))
            {
                logger().debug("Unable to read initial {} from file ({})", x_name, state_path);
                return false;
            }
 
            if (reorder)
            {
                const int ndof = in_node_to_node.size() * dim;
                // only reorder the first ndof rows
                x.topRows(ndof) = utils::reorder_matrix(x.topRows(ndof), in_node_to_node, -1, dim);
            }
 
            return true;
        }
    } // namespace
 
    void State::initial_solution(Eigen::MatrixXd &solution) const
    {
        assert(solve_data.rhs_assembler != nullptr);
 
        const bool was_solution_loaded = read_initial_x_from_file(
            resolve_input_path(args["input"]["data"]["state"]), "u",
            args["input"]["data"]["reorder"], in_node_to_node,
            mesh->dimension(), solution);
 
        if (!was_solution_loaded)
        {
            if (problem->is_time_dependent())
                solve_data.rhs_assembler->initial_solution(solution);
            else
            {
                solution.resize(rhs.size(), 1);
                solution.setZero();
            }
        }
    }
 
    void State::initial_velocity(Eigen::MatrixXd &velocity) const
    {
        assert(solve_data.rhs_assembler != nullptr);
 
        const bool was_velocity_loaded = read_initial_x_from_file(
            resolve_input_path(args["input"]["data"]["state"]), "v",
            args["input"]["data"]["reorder"], in_node_to_node,
            mesh->dimension(), velocity);
 
        if (!was_velocity_loaded)
            solve_data.rhs_assembler->initial_velocity(velocity);
    }
 
    void State::initial_acceleration(Eigen::MatrixXd &acceleration) const
    {
        assert(solve_data.rhs_assembler != nullptr);
 
        const bool was_acceleration_loaded = read_initial_x_from_file(
            resolve_input_path(args["input"]["data"]["state"]), "a",
            args["input"]["data"]["reorder"], in_node_to_node,
            mesh->dimension(), acceleration);
 
        if (!was_acceleration_loaded)
            solve_data.rhs_assembler->initial_acceleration(acceleration);
    }
} // namespace polyfem