You can model heat transfer between one or more points in an assembly and a nonreflecting environment due to radiation by creating a concentrated radiation to ambient interaction. Select Interaction
Create from the main menu bar, and select one or more nodes or vertices or a saved set of nodes or vertices. For a brief overview of radiative interactions, see “Understanding interactions,” Section 15.3. For a more detailed discussion, see “Thermal loads,” Section 19.4.4 of the ABAQUS Analysis User's Manual.
To define a concentrated radiative interaction:
From the main menu bar, select InteractionCreate.
Tip:
You can also create a concentrated radiative 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. You can define radiation from a nodal area only during a heat transfer, coupled temperature-displacement, or coupled thermal-electrical step.
Select the Concentrated radiation to ambient type of interaction.
Click Continue to close the Create Interaction dialog box.
Use one of the following methods to select the points:
Use an existing set of nodes or vertices to define the region. On the right side of the prompt area, click Sets. Select an existing set from the Region Selection dialog box that appears, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
Use the mouse to select nodes or vertices in the viewport. (For more information, see “Selecting objects within the current viewport,” Section 6.2.)
If the model contains a combination of orphan mesh instances and native geometric part instances, click one of the following from the prompt area:
Click Geometry if you want to select vertices from native geometry.
Click Mesh if you want to select nodes from an orphan mesh.
In the Edit Interaction dialog box that appears, enter the required data. You must use the Amplitude toolset to create the desired ambient temperature amplitude.
Note:
You can display help on a particular editor feature by selecting HelpOn Context from the main menu bar and then clicking the editor feature of interest.
Click OK to create the interaction and to close the editor.
