ABAQUS Volume II: I–Z - Manual (Page 113)

*KAPPA
11.1 *KAPPA: Specify the material parameters and for mass diffusion driven by
gradients of temperature and equivalent pressure stress, respectively.
This option is used to introduce temperature- and pressure-driven mass diffusion. It must appear immediately
after the *DIFFUSIVITY option. For each use of the *DIFFUSIVITY option, *KAPPA can be used once with
TYPE=TEMP and once with TYPE=PRESS. The *KAPPA, TYPE=TEMP and *DIFFUSIVITY, LAW=FICK
options are mutually exclusive.
Product: ABAQUS/Standard
Type: Model data
Level: Model
References:
•
“Diffusivity,” Section 20.5.1 of the ABAQUS Analysis User’s Manual
•
*DIFFUSIVITY
Optional parameters:
DEPENDENCIES
Set this parameter equal to the number of field variables included in the definition of or . If
this parameter is omitted, or is assumed not to depend on any field variables but may still
depend on concentration and temperature. See “Specifying field variable dependence” in “Material
data definition,” Section 16.1.2 of the ABAQUS Analysis User’s Manual, for more information.
TYPE
Set TYPE=TEMP (default) to define (governing mass diffusion caused by temperature
gradients). Set TYPE=PRESS to define (governing mass diffusion caused by gradients of the
equivalent pressure stress).
Data lines to define the Soret effect factor, k
s
(TYPE=TEMP):
First line:
1. Soret effect factor, . (Units of F
1/2
L
−1
.)
2. Concentration, c.
3. Temperature, .
4. First field variable.
5. Second field variable.
6. Etc., up to five field variables.
11.1–1
ABAQUS Version 6.1 Module: ID:
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