GrayLambertNeumannBC Class Reference

Boundary condition for radiative heat that is computed by the GrayLambertSurfaceRadiationBase userobject. More...

#include <GrayLambertNeumannBC.h>

Inheritance diagram for GrayLambertNeumannBC:

Public Member Functions
	GrayLambertNeumannBC (const InputParameters &parameters)

Static Public Member Functions
static InputParameters	validParams ()

Static Public Attributes
static Real	_sigma_stefan_boltzmann = 5.670367e-8

Protected Member Functions
virtual Real	computeQpResidual () override
virtual Real	computeQpJacobian () override

Protected Attributes
const GrayLambertSurfaceRadiationBase &	_glsr_uo
bool	_reconstruct_emission

Detailed Description

Boundary condition for radiative heat that is computed by the GrayLambertSurfaceRadiationBase userobject.

Definition at line 24 of file GrayLambertNeumannBC.h.

Constructor & Destructor Documentation

GrayLambertNeumannBC()

GrayLambertNeumannBC::GrayLambertNeumannBC

(

const InputParameters &

parameters

)

Definition at line 34 of file GrayLambertNeumannBC.C.

  : IntegratedBC(parameters),
    _glsr_uo(getUserObject<GrayLambertSurfaceRadiationBase>("surface_radiation_object_name")),
    _reconstruct_emission(getParam<bool>("reconstruct_emission"))
{
}

Member Function Documentation

computeQpJacobian()

Real GrayLambertNeumannBC::computeQpJacobian ( )

overrideprotectedvirtual

Definition at line 53 of file GrayLambertNeumannBC.C.

{
  // this is not the exact Jacobian but it ensures correct scaling
  return _test[_i][_qp] * _sigma_stefan_boltzmann *
         _glsr_uo.getSurfaceEmissivity(_current_boundary_id) * 4 * MathUtils::pow(_u[_qp], 3) *
         _phi[_j][_qp];
}

computeQpResidual()

Real GrayLambertNeumannBC::computeQpResidual ( )

overrideprotectedvirtual

Definition at line 42 of file GrayLambertNeumannBC.C.

{
  if (!_reconstruct_emission)
    return _test[_i][_qp] * _glsr_uo.getSurfaceHeatFluxDensity(_current_boundary_id);
 
  Real eps = _glsr_uo.getSurfaceEmissivity(_current_boundary_id);
  Real emission = _sigma_stefan_boltzmann * MathUtils::pow(_u[_qp], 4);
  return _test[_i][_qp] * eps * (emission - _glsr_uo.getSurfaceIrradiation(_current_boundary_id));
}

validParams()

InputParameters GrayLambertNeumannBC::validParams ( )

static

Definition at line 20 of file GrayLambertNeumannBC.C.

{
  InputParameters params = IntegratedBC::validParams();
  params.addRequiredParam<UserObjectName>("surface_radiation_object_name",
                                          "Name of the GrayLambertSurfaceRadiationBase UO");
  params.addParam<bool>(
      "reconstruct_emission",
      true,
      "Flag to apply constant heat flux on sideset or reconstruct emission by T^4 law.");
  params.addClassDescription("This BC imposes a heat flux density that is computed from the "
                             "GrayLambertSurfaceRadiationBase userobject.");
  return params;
}

Member Data Documentation

_glsr_uo

const GrayLambertSurfaceRadiationBase& GrayLambertNeumannBC::_glsr_uo

protected

Definition at line 37 of file GrayLambertNeumannBC.h.

Referenced by computeQpJacobian(), and computeQpResidual().

_reconstruct_emission

bool GrayLambertNeumannBC::_reconstruct_emission

protected

Definition at line 38 of file GrayLambertNeumannBC.h.

Referenced by computeQpResidual().

_sigma_stefan_boltzmann

Real GrayLambertNeumannBC::_sigma_stefan_boltzmann = 5.670367e-8

static

Definition at line 31 of file GrayLambertNeumannBC.h.

Referenced by computeQpJacobian(), and computeQpResidual().

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The documentation for this class was generated from the following files:

• heat_conduction/include/bcs/GrayLambertNeumannBC.h
• heat_conduction/src/bcs/GrayLambertNeumannBC.C