************************** **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: ======== =============================================== **yes** Calculate the mass diffusion vectors and include in the output EXODUS II file. **no** Do not calculate the mass diffusion vectors. ======== =============================================== ------------ **Examples** ------------ 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. -------------- **References** -------------- No References.