- From the menu bar in the Edit Material dialog box, select .
(For information on displaying the Edit Material dialog box, see Creating or editing a material.) - Click the arrow to the right of the Type field, and specify the directional dependence of the diffusivity.
- Select a Law option to specify how you want to define diffusivity behavior:
For more information, see Defining Diffusivity. - Toggle on Use temperature-dependent data to define diffusivity data as a function of temperature.
A column labeled Temp appears in the Data table. - Click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables on which the diffusivity data depend.
- In the Data table, enter the applicable data:
- D
Isotropic diffusivity. (Units of L2T−1.)
- D11, D22, and D33
Orthotropic diffusivity terms. (Units of L2T−1.)
- D11, D12, D22, D13, D23, D33
Anisotropic diffusivity terms. (Units of L2T−1.)
- Concentration
Mass concentration of the diffusing material.
- Temp
Temperature.
- Field n
Predefined field variables.
You may need to expand the dialog box to see all the columns in the Data table. For detailed information on how to enter data, see Entering tabular data. - To describe temperature-driven diffusion, select from the menu. (This option is valid only if you selected General in Step 3.) See Defining general temperature-driven mass diffusion” for detailed instructions.
- To describe pressure-driven mass diffusion, select from the menu. See Defining pressure-driven mass diffusion” for detailed instructions.
- Click OK to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see Browsing and modifying material behaviors, for more information).
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