heat_transfer_bc_handling.C

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//-----------------------------------------------------------------------bl-
//--------------------------------------------------------------------------
//
// GRINS - General Reacting Incompressible Navier-Stokes
//
// Copyright (C) 2014-2015 Paul T. Bauman, Roy H. Stogner
// Copyright (C) 2010-2013 The PECOS Development Team
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the Version 2.1 GNU Lesser General
// Public License as published by the Free Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc. 51 Franklin Street, Fifth Floor,
// Boston, MA  02110-1301  USA
//
//-----------------------------------------------------------------------el-


// This class
#include "grins/heat_transfer_bc_handling.h"

// libMesh
#include "libmesh/const_function.h"
#include "libmesh/dirichlet_boundaries.h"
#include "libmesh/dof_map.h"
#include "libmesh/fem_system.h"

namespace GRINS
{

  HeatTransferBCHandling::HeatTransferBCHandling(const std::string& physics_name,
                                                 const GetPot& input)
    : BCHandlingBase(physics_name),
      _temp_vars(input)
  {
    std::string id_str = "Physics/"+_physics_name+"/bc_ids";
    std::string bc_str = "Physics/"+_physics_name+"/bc_types";
    std::string var_str = "Physics/"+_physics_name+"/bc_variables";
    std::string val_str = "Physics/"+_physics_name+"/bc_values";

    this->read_bc_data( input, id_str, bc_str, var_str, val_str );

    return;
  }

  HeatTransferBCHandling::~HeatTransferBCHandling()
  {
    return;
  }

  int HeatTransferBCHandling::string_to_int( const std::string& bc_type ) const
  {
    int bc_type_out;

    if( bc_type == "isothermal_wall" )
      bc_type_out = ISOTHERMAL_WALL;
  
    else if( bc_type == "adiabatic_wall" )
      bc_type_out = ADIABATIC_WALL;
  
    else if( bc_type == "prescribed_heat_flux" )
      bc_type_out = PRESCRIBED_HEAT_FLUX;
  
    else if( bc_type == "general_heat_flux" )
      bc_type_out = GENERAL_HEAT_FLUX;

    else
      {
        // Call base class to detect any physics-common boundary conditions
        bc_type_out = BCHandlingBase::string_to_int( bc_type );
      }

    return bc_type_out;
  }

  void HeatTransferBCHandling::init_bc_data( const libMesh::FEMSystem& system )
  {
    _temp_vars.init(const_cast<libMesh::FEMSystem*>(&system));

    return;
  }
  
  void HeatTransferBCHandling::init_bc_types( const BoundaryID bc_id, 
                                              const std::string& bc_id_string, 
                                              const int bc_type, 
                                              const std::string& bc_vars, 
                                              const std::string& bc_value, 
                                              const GetPot& input )
  {
    switch(bc_type)
      {
      case(ISOTHERMAL_WALL):
        {
          this->set_dirichlet_bc_type( bc_id, bc_type );

          this->set_dirichlet_bc_value( bc_id, input("Physics/"+_physics_name+"/T_wall_"+bc_id_string, 0.0 ) );
        }
        break;
      
      case(ADIABATIC_WALL):
        {
          this->set_neumann_bc_type( bc_id, bc_type );
        }
        break;
      
      case(PRESCRIBED_HEAT_FLUX):
        {
          this->set_neumann_bc_type( bc_id, bc_type );
        
          libMesh::RealGradient q_in;
        
          int num_q_components = input.vector_variable_size("Physics/"+_physics_name+"/q_wall_"+bc_id_string);
        
          for( int i = 0; i < num_q_components; i++ )
            {
              q_in(i) = input("Physics/"+_physics_name+"/q_wall_"+bc_id_string, 0.0, i );
            }

          this->set_neumann_bc_value( bc_id, q_in );
        }
        break;
      case(GENERAL_HEAT_FLUX):
        {
          this->set_neumann_bc_type( bc_id, bc_type );
        }
        break;
      default:
        {
          // Call base class to detect any physics-common boundary conditions
          BCHandlingBase::init_bc_types( bc_id, bc_id_string, bc_type,
                                         bc_vars, bc_value, input );
        }
      
      }// End switch(bc_type)

    return;
  }

  void HeatTransferBCHandling::user_init_dirichlet_bcs( libMesh::FEMSystem* /*system*/,
                                                        libMesh::DofMap& dof_map,
                                                        BoundaryID bc_id,
                                                        BCType bc_type ) const
  {
    switch( bc_type )
      {
      case(ISOTHERMAL_WALL):
        {
          std::set<BoundaryID> dbc_ids;
          dbc_ids.insert(bc_id);
        
          std::vector<VariableIndex> dbc_vars;
          dbc_vars.push_back(_temp_vars.T_var());
        
          libMesh::ConstFunction<libMesh::Number>
            t_func(this->get_dirichlet_bc_value(bc_id));
        
          libMesh::DirichletBoundary t_dbc( dbc_ids, dbc_vars, &t_func );
        
          dof_map.add_dirichlet_boundary( t_dbc );
        }
        break;
      default:
        {
          std::cerr << "Error: Invalid Dirichlet BC type for " << _physics_name
                    << std::endl;
          libmesh_error();
        }
      }// end switch

    return;
  }

  void HeatTransferBCHandling::user_apply_neumann_bcs( AssemblyContext& context,
                                                       const GRINS::CachedValues& cache,
                                                       const bool request_jacobian,
                                                       const BoundaryID bc_id,
                                                       const BCType bc_type ) const
  {
    switch( bc_type )
      {
        // Zero heat flux
      case(ADIABATIC_WALL):
        // Don't need to do anything: q = 0 in this case
        break;
      
        // Prescribed constant heat flux
      case(PRESCRIBED_HEAT_FLUX):
        {
          if( this->is_axisymmetric() )
            {
              _bound_conds.apply_neumann_axisymmetric( context, _temp_vars.T_var(), -1.0,
                                                       this->get_neumann_bc_value(bc_id) );
            }
          else
            {
              _bound_conds.apply_neumann( context, _temp_vars.T_var(), -1.0,
                                          this->get_neumann_bc_value(bc_id) );
            }
        }
        break;
        // General heat flux from user specified function
      case(GENERAL_HEAT_FLUX):
        {
          if( this->is_axisymmetric() )
            {
              _bound_conds.apply_neumann_axisymmetric( context, cache, request_jacobian, _temp_vars.T_var(), -1.0, 
                                                       this->get_neumann_bound_func( bc_id, _temp_vars.T_var() ) );
            }
          else
            {
              _bound_conds.apply_neumann( context, cache, request_jacobian, _temp_vars.T_var(), -1.0, 
                                          this->get_neumann_bound_func( bc_id, _temp_vars.T_var() ) );
            }
        }
        break;
      default:
        {
          std::cerr << "Error: Invalid Neumann BC type for " << _physics_name
                    << std::endl;
          libmesh_error();
        }
      } // End switch
  
    return;
  }

} // namespace GRINS