Diffusivity object

The Diffusivity object specifies mass diffusivity.

The following topics are discussed:

Access
Diffusivity(...)
setValues(...)
Members
Corresponding analysis keywords

Access

import material
mdb.models[name].materials[name].diffusivity
import odbMaterial
session.odbs[name].materials[name].diffusivity

Diffusivity(...)

This method creates a Diffusivity object.

Path

mdb.models[name].materials[name].Diffusivity
session.odbs[name].materials[name].Diffusivity

Required arguments

table: A sequence of sequences of Floats specifying the items described below.

Optional arguments

type: A SymbolicConstant specifying the type of diffusivity. Possible values are ISOTROPIC, ORTHOTROPIC, and ANISOTROPIC. The default value is ISOTROPIC.
law: A SymbolicConstant specifying the diffusion behavior. Possible values are GENERAL and FICK. The default value is GENERAL.
temperatureDependency: A Boolean specifying whether the data depend on temperature. The default value is OFF.
dependencies: An Int specifying the number of field variable dependencies. The default value is 0.

Table data

If type=ISOTROPIC, the table data specify the following:

Diffusivity, $D$ .
Concentration, $c$ .
Temperature, if the data depend on temperature.
Value of the first field variable, if the data depend on field variables.
Value of the second field variable.
Etc.

If type=ORTHOTROPIC, the table data specify the following:

$D_{11}$ .
$D_{22}$ .
$D_{33}$ .
Concentration, $c$ .
Temperature, if the data depend on temperature.
Value of the first field variable, if the data depend on field variables.
Value of the second field variable.
Etc.

If type=ANISOTROPIC, the table data specify the following:

$D_{11}$ .
$D_{12}$ .
$D_{22}$ .
$D_{13}$ .
$D_{23}$ .
$D_{33}$ .
Concentration, $c$ .
Temperature, if the data depend on temperature.
Value of the first field variable, if the data depend on field variables.
Value of the second field variable.
Etc.

Return value

A Diffusivity object.

Exceptions

RangeError.

setValues(...)

This method modifies the Diffusivity object.

Required arguments

None.

Optional arguments

The optional arguments to setValues are the same as the arguments to the Diffusivity method.

Return value

None.

Exceptions

RangeError.

Members

The Diffusivity object has members with the same names and descriptions as the arguments to the Diffusivity method.

In addition, the Diffusivity object can have the following members:

pressureEffect: A PressureEffect object.
soretEffect: A SoretEffect object.

Corresponding analysis keywords

DIFFUSIVITY