flow_solver_case_base.cpp

#include "flow_solver_case_base.h"

namespace PHiLiP {
namespace FlowSolver {

template<int dim, int nstate>
FlowSolverCaseBase<dim, nstate>::FlowSolverCaseBase(const PHiLiP::Parameters::AllParameters *const parameters_input)
        : initial_condition_function(InitialConditionFactory<dim, nstate, double>::create_InitialConditionFunction(parameters_input))
        , all_param(*parameters_input)
        , mpi_communicator(MPI_COMM_WORLD)
        , mpi_rank(dealii::Utilities::MPI::this_mpi_process(MPI_COMM_WORLD))
        , n_mpi(dealii::Utilities::MPI::n_mpi_processes(MPI_COMM_WORLD))
        , pcout(std::cout, mpi_rank==0)
        {}

template<int dim, int nstate>
std::string FlowSolverCaseBase<dim, nstate>::get_pde_string() const
{
    using PDE_enum       = Parameters::AllParameters::PartialDifferentialEquation;
    using Model_enum     = Parameters::AllParameters::ModelType;
    using SGSModel_enum  = Parameters::PhysicsModelParam::SubGridScaleModel;
    using RANSModel_enum = Parameters::PhysicsModelParam::ReynoldsAveragedNavierStokesModel;
    
    const PDE_enum pde_type = this->all_param.pde_type;
    std::string pde_string;
    if (pde_type == PDE_enum::advection)            {pde_string = "advection";}
    if (pde_type == PDE_enum::advection_vector)     {pde_string = "advection_vector";}
    if (pde_type == PDE_enum::diffusion)            {pde_string = "diffusion";}
    if (pde_type == PDE_enum::convection_diffusion) {pde_string = "convection_diffusion";}
    if (pde_type == PDE_enum::burgers_inviscid)     {pde_string = "burgers_inviscid";}
    if (pde_type == PDE_enum::burgers_viscous)      {pde_string = "burgers_viscous";}
    if (pde_type == PDE_enum::burgers_rewienski)    {pde_string = "burgers_rewienski";}
    if (pde_type == PDE_enum::mhd)                  {pde_string = "mhd";}
    if (pde_type == PDE_enum::euler)                {pde_string = "euler";}
    if (pde_type == PDE_enum::navier_stokes)        {pde_string = "navier_stokes";}
    if (pde_type == PDE_enum::physics_model) {
        pde_string = "physics_model";
        // add the model name + sub model name (if applicable)
        const Model_enum model = this->all_param.model_type;
        std::string model_string = "WARNING: invalid model";
        if(model == Model_enum::large_eddy_simulation) {
            // assign model string
            model_string = "large_eddy_simulation";
            // sub-grid scale (SGS)
            const SGSModel_enum sgs_model = this->all_param.physics_model_param.SGS_model_type;
            std::string sgs_model_string = "WARNING: invalid SGS model";
            // assign SGS model string
            if     (sgs_model==SGSModel_enum::smagorinsky) sgs_model_string = "smagorinsky";
            else if(sgs_model==SGSModel_enum::wall_adaptive_local_eddy_viscosity) sgs_model_string = "wall_adaptive_local_eddy_viscosity";
            else if(sgs_model==SGSModel_enum::vreman) sgs_model_string = "vreman";
            pde_string += std::string(" (Model: ") + model_string + std::string(", SGS Model: ") + sgs_model_string + std::string(")");
        }
        else if(model == Model_enum::reynolds_averaged_navier_stokes) {
            // assign model string
            model_string = "reynolds_averaged_navier_stokes";
            // reynolds-averaged navier-stokes (RANS)
            const RANSModel_enum rans_model = this->all_param.physics_model_param.RANS_model_type;
            std::string rans_model_string = "WARNING: invalid RANS model";
            // assign RANS model string
            if (rans_model==RANSModel_enum::SA_negative) rans_model_string = "SA_negative";
            pde_string += std::string(" (Model: ") + model_string + std::string(", RANS Model: ") + rans_model_string + std::string(")");
        }
        if(pde_string == "physics_model") pde_string += std::string(" (Model: ") + model_string + std::string(")");
    }
    
    return pde_string;
}

template<int dim, int nstate>
std::string FlowSolverCaseBase<dim, nstate>::get_flow_case_string() const
{
    // Get the flow case type
    using FlowCaseEnum = Parameters::FlowSolverParam::FlowCaseType;
    const FlowCaseEnum flow_case_type = this->all_param.flow_solver_param.flow_case_type;
    
    std::string flow_case_string;
    if (flow_case_type == FlowCaseEnum::taylor_green_vortex)        {flow_case_string = "taylor_green_vortex";}
    if (flow_case_type == FlowCaseEnum::burgers_viscous_snapshot)   {flow_case_string = "burgers_viscous_snapshot";}
    if (flow_case_type == FlowCaseEnum::burgers_rewienski_snapshot) {flow_case_string = "burgers_rewienski_snapshot";}
    if (flow_case_type == FlowCaseEnum::naca0012)                   {flow_case_string = "naca0012";}
    if (flow_case_type == FlowCaseEnum::periodic_1D_unsteady)       {flow_case_string = "periodic_1D_unsteady";}
    if (flow_case_type == FlowCaseEnum::gaussian_bump)              {flow_case_string = "gaussian_bump";}
    if (flow_case_type == FlowCaseEnum::advection_limiter)          {flow_case_string = "advection_limiter";}

    return flow_case_string;
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim,nstate>::display_flow_solver_setup(std::shared_ptr<DGBase<dim,double>> dg) const
{
    const std::string pde_string = this->get_pde_string();
    pcout << "- PDE Type: " << pde_string << " " << "(dim=" << dim << ", nstate=" << nstate << ")" << std::endl;
    
    pcout << "- Polynomial degree: " << this->all_param.flow_solver_param.poly_degree << std::endl;
    pcout << "- Maximum polynomial degree for adaptation: " << this->all_param.flow_solver_param.max_poly_degree_for_adaptation << std::endl;

    const unsigned int number_of_degrees_of_freedom_per_state = dg->dof_handler.n_dofs()/nstate;
    const double number_of_degrees_of_freedom_per_dim = pow(number_of_degrees_of_freedom_per_state,(1.0/dim));
    pcout << "- Degrees of freedom (per state): " << number_of_degrees_of_freedom_per_state << " " << "(" << number_of_degrees_of_freedom_per_dim << " per state per dim)" << std::endl;
    pcout << "- Number of active cells: " << dg->triangulation->n_global_active_cells() << std::endl;
    
    const bool use_weak_form = this->all_param.use_weak_form;
    
    if (use_weak_form == false){
        this->pcout << "- Using strong DG" << std::endl;

        // only print c param for strong DG as FR is implemented only for strong
        std::string c_parameter_string;
        using FREnum = Parameters::AllParameters::Flux_Reconstruction;
        FREnum fr_type = this->all_param.flux_reconstruction_type;
        if (fr_type == FREnum::cDG)              c_parameter_string = "cDG";
        else if (fr_type == FREnum::cSD)         c_parameter_string = "cSD";
        else if (fr_type == FREnum::cHU)         c_parameter_string = "cHU";
        else if (fr_type == FREnum::cNegative)   c_parameter_string = "cNegative";
        else if (fr_type == FREnum::cNegative2)  c_parameter_string = "cNegative2";
        else if (fr_type == FREnum::cPlus)       c_parameter_string = "cPlus";
        else if (fr_type == FREnum::c10Thousand) c_parameter_string = "c10Thousand";
        else if (fr_type == FREnum::cHULumped)   c_parameter_string = "cHULumped";

        if (c_parameter_string == "cDG" ) {
            // No additional output to indicate classical strong DG
        } else {
            if(fr_type == FREnum::user_specified_value) {
                this->pcout << "- - Using user specified flux reconstruction c parameter: " 
                            << this->all_param.FR_user_specified_correction_parameter_value 
                            << std::endl;
            }
            else {
                this->pcout << "- - Using flux reconstruction c parameter: " << c_parameter_string << std::endl;
            }
        }

        const bool use_split_form = this->all_param.use_split_form;
        if (use_split_form){
            this->pcout << "- - Using split form " << std::endl;
        }
    }
    else{
        this->pcout << "- Using weak DG" << std::endl;

    }

    const std::string flow_case_string = this->get_flow_case_string();
    pcout << "- Flow case: " << flow_case_string << " " << std::flush;
    if(this->all_param.flow_solver_param.steady_state == true) {
        pcout << "(Steady state)" << std::endl;
    } else {
        pcout << "(Unsteady)" << std::endl;
        pcout << "- - Final time: " << this->all_param.flow_solver_param.final_time << std::endl;
    }

    this->display_additional_flow_case_specific_parameters();
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim,nstate>::set_higher_order_grid(std::shared_ptr<DGBase<dim, double>> /*dg*/) const
{
    // Do nothing
}

template <int dim, int nstate>
double FlowSolverCaseBase<dim,nstate>::get_constant_time_step(std::shared_ptr<DGBase<dim,double>> /*dg*/) const
{
    if(all_param.flow_solver_param.constant_time_step > 0.0) {
        // Using constant time step in FlowSolver parameters.
        return all_param.flow_solver_param.constant_time_step;
    } else {
        // Using initial time step in ODE parameters.
        return all_param.ode_solver_param.initial_time_step;
    }
}

template <int dim, int nstate>
double FlowSolverCaseBase<dim,nstate>::get_adaptive_time_step(std::shared_ptr<DGBase<dim,double>> /*dg*/) const
{
    pcout << "ERROR: Base definition for get_adaptive_time_step() has not yet been implemented. " <<std::flush;
    std::abort();
    return 0.0;
}

template <int dim, int nstate>
double FlowSolverCaseBase<dim,nstate>::get_adaptive_time_step_initial(std::shared_ptr<DGBase<dim,double>> /*dg*/)
{
    pcout << "ERROR: Base definition for get_adaptive_time_step_initial() has not yet been implemented. " <<std::flush;
    std::abort();
    return 0.0;
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim, nstate>::steady_state_postprocessing(std::shared_ptr <DGBase<dim, double>> /*dg*/) const
{
    // do nothing by default
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim, nstate>::compute_unsteady_data_and_write_to_table(
        const std::shared_ptr<ODE::ODESolverBase<dim, double>> ode_solver, 
        const std::shared_ptr <DGBase<dim, double>> dg,
        const std::shared_ptr <dealii::TableHandler> unsteady_data_table)
{
    this->compute_unsteady_data_and_write_to_table(ode_solver->current_iteration, ode_solver->current_time, dg, unsteady_data_table);
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim, nstate>::compute_unsteady_data_and_write_to_table(
        const unsigned int /*current_iteration*/,
        const double /*current_time*/,
        const std::shared_ptr <DGBase<dim, double>> /*dg*/,
        const std::shared_ptr <dealii::TableHandler> /*unsteady_data_table*/)
{
    // do nothing by default
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim, nstate>::add_value_to_data_table(
    const double value,
    const std::string value_string,
    const std::shared_ptr <dealii::TableHandler> data_table) const
{
    data_table->add_value(value_string, value);
    data_table->set_precision(value_string, 16);
    data_table->set_scientific(value_string, true);
}

template <int dim, int nstate>
void FlowSolverCaseBase<dim, nstate>::set_time_step(
    const double time_step_input)
{
    this->time_step = time_step_input;
}

template <int dim, int nstate>
double FlowSolverCaseBase<dim, nstate>::get_time_step() const
{
    return this->time_step;
}

template class FlowSolverCaseBase<PHILIP_DIM,1>;
template class FlowSolverCaseBase<PHILIP_DIM,2>;
template class FlowSolverCaseBase<PHILIP_DIM,3>;
template class FlowSolverCaseBase<PHILIP_DIM,4>;
template class FlowSolverCaseBase<PHILIP_DIM,5>;
template class FlowSolverCaseBase<PHILIP_DIM,6>;

} // FlowSolver namespace
} // PHiLiP namespace