You can create the following interactions:
Contact.
Elastic foundations.
Heat flux on a surface or a point due to convection.
Heat flux on a surface or a point due to radiation to the environment.
Interactions between a point and a user-defined actuator/sensor element.
To create interactions:
From the main menu bar, select Interaction
Create.
Tip:
You can also create an interaction using the 
tool in the Interaction module toolbox.
In the Create Interaction dialog box that appears, do the following:
Name the interaction. For more information about naming objects, see “Using basic dialog box components,” Section 3.2.1.
Select the step in which the interaction will be created.
Select the interaction type.
Click Continue to create the interaction and to close the Create Interaction dialog box.
Select the region to which to apply the interaction (not applicable to general contact interactions). For more information, see Chapter 6, “Selecting objects within the viewport.”
In the editor that appears or, if applicable, in the prompt area, enter any data necessary to define the interaction.
For detailed instructions on creating different types of interactions, see the following sections:
