Defines the isotropic source from fission reactions. More...

Inheritance diagram for FissionSource:

Collaboration diagram for FissionSource:

Public Member Functions
function	FissionSource (in state, in mesh, in mat)
	Class constructor.
function	initialize (in obj)
	Initialize the fission source.
function	reset (in obj)
function	initialized (in obj)
function	update (in obj)
	Update the fission density.
function	normalize (in obj)
	Normalize the fission density.
function	setup_outer (in obj, in scale)
	Setup the fission source for an outer iteration.
function	source (in obj, in g)
	Return the fission source in a group.
function	density (in obj)
Private Attributes
Property	d_state
	State vectors.
Property	d_mesh
	Problem mesh.
Property	d_mat
	Material definitions.
Property	d_nu_sigma_f
	Vector of $\nu \Sigma_f$ values for dot product.
Property	d_chi
	Vector $\chi$ values for dot product.
Property	d_fission_density
	Fission density, $f = \sum_g \nu\Sigma_{f,g} \phi_g$ .
Property	d_fission_source
	Fission source, $\textrm{scale} \times f$ .
Property	d_scale
	Fission source scaling term.
Property	d_angular_norm
Property	d_initialized
	Are we initialized?

Detailed Description

Defines the isotropic source from fission reactions.

Constructor & Destructor Documentation

function FissionSource	(	in	state,
		in	mesh,
		in	mat
	)

Class constructor.

Parameters:

mesh	Problem mesh.
mat	Material definitions.

Returns:: Instance of the FissionSource class.

Member Function Documentation

function density ( in obj )

function initialize ( in obj )

Initialize the fission source.

Having a separate initialization routine lets us pass around an empty fission source object, yielding more generic programming.

function initialized ( in obj )

function normalize ( in obj )

Normalize the fission density.

This can be useful if one wants the initial guess to be normalized.

function reset ( in obj )

function setup_outer	(	in	obj,
		in	scale
	)

Setup the fission source for an outer iteration.

This sets a new scaling factor $ k $ and precomputes the quantity $v = (4\pi k)^{-1}$ .

Parameters:

scale Scaling factor (typically 1/keff)

function source	(	in	obj,
		in	g
	)

Return the fission source in a group.

The group fission source is just that component of the density released in a particular group. Mathematically, this is just

$q_{f,g} = \frac{\chi_g}{4\pi k} \sum_g \nu\Sigma_{f,g} \phi_g \, .$

Note, the scaling factor is actually arbitrary. For 2-D and 3-D, it is $4\pi$ , possibly with the eigenvalue $ k $ . The client sets this in update.

Note also that this returns a discrete source, ready for use in sweeping.

Parameters:

g	Group of the source

Returns:: Source vector

function update ( in obj )

Update the fission density.

The fission source density is defined

$f = \sum_g \nu\Sigma_{f,g} \phi_g \, .$

This density is updated at the beginning of an outer iteration when a new (or initial) scalar flux is known. At this time, a scaling factor can be set. Most often, this is based on an updated eigenvalue estimate (for reactor problems), or may be any other arbitrary value as needed for a variety of problems.

Parameters:

scale Scaling factor (typically 1/keff)

Member Data Documentation

Property d_angular_norm [private]

Property d_chi [private]

Vector $\chi$ values for dot product.

Property d_fission_density [private]

Fission density, $f = \sum_g \nu\Sigma_{f,g} \phi_g$ .

Property d_fission_source [private]

Fission source, $\textrm{scale} \times f$ .

Property d_initialized [private]

Are we initialized?

Property d_mat [private]

Material definitions.

Property d_mesh [private]

Problem mesh.

Property d_nu_sigma_f [private]

Vector of $\nu \Sigma_f$ values for dot product.

Property d_scale [private]

Fission source scaling term.

Property d_state [private]

State vectors.

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

/home/robertsj/Research/matlab_transport_pack/source/FissionSource.m

FissionSource Class Reference

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation