Mass Transfer Analyses

The setup of a mass transfer model has one requirement that other analysis types do not have. In mass transfer, the global Species that exist in the entire model must be defined before:

• assigning the Species Definition (equivalent to the Element Definition for other analysis types) to each part,
• applying loads and constraints to the model.

If the global Species are not defined first, then specifying which species appears in each part cannot be done, and loads cannot be applied to the model.

The Species branch of the tree view is a list of all species or materials that appear in any part of the model. To define the species, do the following:

1. Right-click the Species entry in the tree view and choose Add New Species. The Creating Mass Species dialog will appear.
2. Enter the Name of the species. (This name will appear in the other dialogs, so each species should have a unique name.)
3. Enter the Default Diffusivity of the species. The default will be used for each species in each part unless you explicitly changes it in a given part.

Once they are created, individual species can be modified or deleted by right-clicking on the species in the global Species branch.