VacuumConcBC Class Reference

#include <VacuumConcBC.h>

Inheritance diagram for VacuumConcBC:

Public Member Functions
	VacuumConcBC (const InputParameters &parameters)
Public Member Functions inherited from ScalarTransportBase
	ScalarTransportBase (const InputParameters &parameters)
virtual Real	computeConcentration (const VariableValue &u, unsigned int qp)
	Computes \(c\).
virtual RealVectorValue	computeConcentrationGradient (const VariableValue &u, const VariableGradient &grad_u, unsigned int qp)
	Computes \(\nabla c\).
virtual Real	computeConcentrationDerivative (const VariableValue &u, const VariablePhiValue &phi, unsigned int j, unsigned int qp)
	Computes \(\frac{\partial c}{\partial u_j}\).
virtual RealVectorValue	computeConcentrationGradientDerivative (const VariableValue &u, const VariableGradient &grad_u, const VariablePhiValue &phi, const VariablePhiGradient &grad_phi, unsigned int j, unsigned int qp)
	Computes \(\nabla \frac{\partial c}{\partial u_j}\).
virtual Real	computeConcentrationDot (const VariableValue &u, const VariableValue &u_dot, unsigned int qp)
	Computes \(\frac{\partial c}{\partial t}\).
virtual Real	computeConcentrationDotDerivative (const VariableValue &u, const VariableValue &u_dot, const VariableValue &du_dot_du, const VariablePhiValue &phi, unsigned int j, unsigned int qp)
	Computes \(\frac{\partial}{\partial t} \frac{\partial c}{\partial u_j}\).

Static Public Member Functions
static InputParameters	validParams ()
Static Public Member Functions inherited from ScalarTransportBase
static InputParameters	validParams ()

Protected Types
enum	BC_TYPE { MARSHAK , MARK , MILNE }

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

Protected Attributes
Real	_alpha
Real	_milne_extrapolation_coefficient = 3 * 0.710446

Detailed Description

Implements a simple VacuumConc BC for neutron diffusion on vacuum boundaries. VacuumConc BC is defined as \( D\frac{du}{dn}+\frac{u}{\alpha} = 0\), where u is neutron flux. Hence, \( D\frac{du}{dn}=-\frac{u}{\alpha} \) and \( -\frac{u}{\alpha} \) is substituted into the Neumann BC term produced from integrating the diffusion operator by parts.

The three types of vacuum BCs available are Marshak ($\alpha=2$), Mark ($\alpha=\sqrt{3}$), and Milne ($\alpha=3\times 0.710446$). VacuumConcBC defaults to Marshak if bc_type is not set.

Member Enumeration Documentation

BC_TYPE

enum VacuumConcBC::BC_TYPE

protected

Enumerator
MARSHAK
MARK
MILNE

Constructor & Destructor Documentation

VacuumConcBC()

VacuumConcBC::VacuumConcBC

(

const InputParameters &

parameters

)

Factory constructor, takes parameters so that all derived classes can be built using the same constructor.

Member Function Documentation

computeQpJacobian()

Real VacuumConcBC::computeQpJacobian ( )

overrideprotectedvirtual

computeQpResidual()

Real VacuumConcBC::computeQpResidual ( )

overrideprotectedvirtual

validParams()

InputParameters VacuumConcBC::validParams ( )

static

Member Data Documentation

_alpha

Real VacuumConcBC::_alpha

protected

_milne_extrapolation_coefficient

Real VacuumConcBC::_milne_extrapolation_coefficient = 3 * 0.710446

protected

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

• include/bcs/VacuumConcBC.h
• src/bcs/VacuumConcBC.C