diffusion#

Description#

Diffusion behavior is analogous to the stationary thermal behaviors.

(318)#\[\vect{J} = \bf D \nabla C\]

Syntax#

***behavior diffusion \(~\,\) **inter_phase_diffusion val \(~\,\) **phase \(~\,~\,~\,\) D COEFFICIENT \(~\,~\,~\,\) comp_max val \(~\,~\,~\,\) comp_min val

Stored Variables

prefix

size

description

default

dC

V

gradient of concentration

yes

J

V

flux of concentration

yes

C

S

the concentration

yes

phase

S

phase id (in input order)

yes

Deff

S

effective D at point

yes

Example#

***behavior diffusion
  **inter_phase_diffusion 8.e-10
  **phase oxide
      D 1.e-7
      comp_min 1200.0
  **phase metal
      D 5.e-9
      comp_max 400.
***return