You can create a concentrated concentration flux load to define a concentrated concentration flux at a vertex or node in a mass diffusion analysis.
To create or edit a concentrated concentration flux:
Display the concentrated concentration flux load editor using one of the following methods:
To create a new concentrated concentration flux load, follow the procedure outlined in “Creating loads,” Section 16.8.1 (Category: Mass diffusion; Types for Selected Step: Concentrated concentration flux).
To edit an existing concentrated concentration flux load using menus or managers, see “Editing step-dependent objects,” Section 3.4.13. To edit the region to which the load is applied, see “Editing the region to which a prescribed condition is applied,” Section 16.8.4.
Click the arrow to the right of the Distribution field, and select the option of your choice from the list that appears:
Select Uniform to define a load that is uniform over the region.
Select an analytical field to define a spatially varying load. Only analytical fields that are valid for this load type are displayed in the selection list. Alternatively, you can click 
to create a new analytical field. (See Chapter 58, “The Analytical Field toolset,” for more information.)
In the Magnitude field, enter the concentration flux magnitude (units PL3T–1). A positive magnitude indicates concentration flow into the body at the vertex or node.
If desired, click the arrow to the right of the Amplitude field, and select the amplitude of your choice from the list that appears. Alternatively, you can click 
to create a new amplitude. (See Chapter 57, “The Amplitude toolset,” for more information.)
Click OK to save your data and to exit the editor.
