Mass Diffusion Vectors#

Mass Diffusion Vectors = {yes | no}

Description / Usage#

Activating this post-processing option allows the user to visualize the diffusive mass flux directions of all species components in a problem. Species components result from the EQ = species_bulk equation card. With this option selected, the output EXODUS II file will contain nodal variables called Y0dif0 (diffusion of first species in x direction), Y0dif1 (diffusion of first species in y direction), Y0dif2 (diffusion of first species in z direction), Y1dif0 (diffusion of second species in x direction), Y2dif1 (diffusion of second species in y direction), … and so on, depending on the number of species components in the problem.

The permissible values for this postprocessing option are:


Calculate the mass diffusion vectors and include in the output EXODUS II file.


Do not calculate the mass diffusion vectors.


Following is a sample card:

Mass Diffusion Vectors = yes

Technical Discussion#

Currently this option is available only for FICKIAN and HYDRODYNAMIC mass flux types (see Diffusion Constitutive Equation card). In the FICKIAN case, the flux is computed with the base, constant diffusivity.


No References.