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solid_mechanics_bc_handling.C
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solid_mechanics_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/solid_mechanics_bc_handling.h"
// libMesh
#include "libmesh/zero_function.h"
#include "libmesh/dirichlet_boundaries.h"
#include "libmesh/dof_map.h"
#include "libmesh/fem_system.h"
namespace GRINS
{
SolidMechanicsBCHandling::SolidMechanicsBCHandling( const std::string& physics_name,
const GetPot& input )
: BCHandlingBase(physics_name),
_disp_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;
}
SolidMechanicsBCHandling::~SolidMechanicsBCHandling()
{
return;
}
int SolidMechanicsBCHandling::string_to_int( const std::string& bc_type ) const
{
int bc_type_out;
if( bc_type == "pinned" )
bc_type_out = PINNED;
else if( bc_type == "constant_displacement" )
bc_type_out = CONSTANT_DISPLACEMENT;
else if( bc_type == "roller_x" )
bc_type_out = ROLLER_X;
else if( bc_type == "roller_y" )
bc_type_out = ROLLER_Y;
else if( bc_type == "roller_z" )
bc_type_out = ROLLER_Z;
else if( bc_type == "constant_traction" )
bc_type_out = CONSTANT_TRACTION;
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 SolidMechanicsBCHandling::init_bc_data( const libMesh::FEMSystem& system )
{
_disp_vars.init(const_cast<libMesh::FEMSystem*>(&system));
return;
}
void SolidMechanicsBCHandling::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(PINNED):
{
this->set_dirichlet_bc_type( bc_id, bc_type );
}
break;
case(CONSTANT_DISPLACEMENT):
{
this->set_dirichlet_bc_type( bc_id, bc_type );
int n_disp_comps = input.vector_variable_size("Physics/"+_physics_name+"/displacement_"+bc_id_string);
if( _disp_vars.have_v() )
{
if( n_disp_comps < 2 )
{
std::cerr << "Error: Must specify at least 2 displacement components for 2-D problem." << std::endl;
libmesh_error();
}
}
if( _disp_vars.have_w() )
{
if( n_disp_comps < 3 )
{
std::cerr << "Error: Must specify 3 displacement components for 3-D problem." << std::endl;
libmesh_error();
}
}
for( int i = 0; i < n_disp_comps; i++ )
{
this->set_dirichlet_bc_value( bc_id,
input("Physics/"+_physics_name+"/displacement_"+bc_id_string, 0.0, i ),
i );
}
}
break;
case(ROLLER_X):
case(ROLLER_Y):
case(ROLLER_Z):
{
this->set_dirichlet_bc_type( bc_id, bc_type );
}
break;
case(CONSTANT_TRACTION):
{
this->set_neumann_bc_type( bc_id, bc_type );
libMesh::Gradient t_in;
int num_t_components = input.vector_variable_size("Physics/"+_physics_name+"/traction_"+bc_id_string);
if( num_t_components < 3 )
{
std::cerr << "Error: Expecting 3 components when specifying traction!" << std::endl
<< " Found " << num_t_components << " components." << std::endl;
libmesh_error();
}
for( int i = 0; i < num_t_components; i++ )
{
t_in(i) = input("Physics/"+_physics_name+"/traction_"+bc_id_string, 0.0, i );
}
this->set_neumann_bc_value( bc_id, t_in );
}
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 SolidMechanicsBCHandling::user_init_dirichlet_bcs( libMesh::FEMSystem* system,
libMesh::DofMap& dof_map,
BoundaryID bc_id,
BCType bc_type ) const
{
VariableIndex u_var = _disp_vars.u_var();
libmesh_assert(system->has_variable(_disp_vars.u_var_name()));
VariableIndex v_var;
if( _disp_vars.have_v() )
{
v_var = _disp_vars.v_var();
libmesh_assert(system->has_variable(_disp_vars.v_var_name()));
}
VariableIndex w_var;
if( _disp_vars.have_w() )
{
w_var = _disp_vars.w_var();
libmesh_assert(system->has_variable(_disp_vars.w_var_name()));
}
switch( bc_type )
{
case(PINNED):
{
std::set<BoundaryID> dbc_ids;
dbc_ids.insert(bc_id);
std::vector<VariableIndex> dbc_vars;
dbc_vars.push_back(u_var);
if( _disp_vars.have_v() )
dbc_vars.push_back(v_var);
if( _disp_vars.have_w() )
dbc_vars.push_back(w_var);
libMesh::ZeroFunction<libMesh::Number> zero;
libMesh::DirichletBoundary no_slip_dbc(dbc_ids,
dbc_vars,
&zero );
dof_map.add_dirichlet_boundary( no_slip_dbc );
}
break;
case(CONSTANT_DISPLACEMENT):
{
std::set<BoundaryID> dbc_ids;
dbc_ids.insert(bc_id);
std::vector<VariableIndex> dbc_vars;
// This is inefficient, but it shouldn't matter because
// everything gets cached on the libMesh side so it should
// only affect performance at startup.
{
dbc_vars.push_back(u_var);
libMesh::ConstFunction<libMesh::Number>
disp_func( this->get_dirichlet_bc_value(bc_id,0) );
libMesh::DirichletBoundary disp_dbc(dbc_ids,
dbc_vars,
&disp_func );
dof_map.add_dirichlet_boundary( disp_dbc );
dbc_vars.clear();
}
if( _disp_vars.have_v() )
{
dbc_vars.push_back(v_var);
libMesh::ConstFunction<libMesh::Number>
disp_func( this->get_dirichlet_bc_value(bc_id,1) );
libMesh::DirichletBoundary disp_dbc(dbc_ids,
dbc_vars,
&disp_func );
dof_map.add_dirichlet_boundary( disp_dbc );
dbc_vars.clear();
}
if( _disp_vars.have_w() )
{
dbc_vars.push_back(w_var);
libMesh::ConstFunction<libMesh::Number>
disp_func( this->get_dirichlet_bc_value(bc_id,2) );
libMesh::DirichletBoundary disp_dbc(dbc_ids,
dbc_vars,
&disp_func );
dof_map.add_dirichlet_boundary( disp_dbc );
}
}
break;
// Roller is free to move in the x-direction, so pin y and z-directions
case(ROLLER_X):
{
std::set<BoundaryID> dbc_ids;
dbc_ids.insert(bc_id);
std::vector<VariableIndex> dbc_vars;
if( _disp_vars.have_v() )
dbc_vars.push_back(v_var);
if( _disp_vars.have_w() )
dbc_vars.push_back(w_var);
libMesh::ZeroFunction<libMesh::Number> zero;
libMesh::DirichletBoundary no_slip_dbc(dbc_ids,
dbc_vars,
&zero );
dof_map.add_dirichlet_boundary( no_slip_dbc );
}
break;
// Roller is free to move in the y-direction, so pin x and z-directions
case(ROLLER_Y):
{
std::set<BoundaryID> dbc_ids;
dbc_ids.insert(bc_id);
std::vector<VariableIndex> dbc_vars;
dbc_vars.push_back(u_var);
if( _disp_vars.have_w() )
dbc_vars.push_back(w_var);
libMesh::ZeroFunction<libMesh::Number> zero;
libMesh::DirichletBoundary no_slip_dbc(dbc_ids,
dbc_vars,
&zero );
dof_map.add_dirichlet_boundary( no_slip_dbc );
}
break;
// Roller is free to move in the z-direction, so pin x and y-directions
case(ROLLER_Z):
{
std::set<BoundaryID> dbc_ids;
dbc_ids.insert(bc_id);
std::vector<VariableIndex> dbc_vars;
dbc_vars.push_back(u_var);
dbc_vars.push_back(v_var);
libMesh::ZeroFunction<libMesh::Number> zero;
libMesh::DirichletBoundary no_slip_dbc(dbc_ids,
dbc_vars,
&zero );
dof_map.add_dirichlet_boundary( no_slip_dbc );
}
break;
default:
{
std::cerr << "Invalid BCType " << bc_type << std::endl;
libmesh_error();
}
}// end switch
return;
}
void SolidMechanicsBCHandling::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 )
{
case(CONSTANT_TRACTION):
{
const libMesh::Point& traction = this->get_neumann_bc_value(bc_id);
_bound_conds.apply_neumann_normal( context, _disp_vars.u_var(), 1.0, traction(0) );
if( _disp_vars.have_v() )
_bound_conds.apply_neumann_normal( context, _disp_vars.v_var(), 1.0, traction(1) );
if( _disp_vars.have_w() )
_bound_conds.apply_neumann_normal( context, _disp_vars.w_var(), 1.0, traction(2) );
}
break;
default:
{
std::cerr << "Error: Invalid Neumann BC type for " << _physics_name
<< std::endl;
libmesh_error();
}
} // switch( bc_type )
return;
}
} // end namespace GRINS