You can create a body current density load to define current density over a volume in an eddy current analysis. The body current density load is available only in an electromagnetic model.
To create or edit a body current density:
Display the body current density load editor using one of the following methods:
To create a new body current density load, follow the procedure outlined in “Creating loads,” Section 16.8.1 (Category: Electrical/Magnetic; Types for Selected Step: Body current density).
To edit an existing body current density 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 volume.
Select User-defined to define the magnitude and direction of the load in user subroutine UDECURRENT. See the following sections for more information:
If you selected the Uniform distribution option, perform the following steps:
In the Component 1, Component 2, and (if applicable) Component 3 fields, enter the real (in-phase) and imaginary (out-of-phase) parts of the body current density vector.
Abaqus/CAE calculates the magnitude and direction of the body current density vector.
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.
If you selected the User-defined distribution option, perform the following steps:
If desired, in the Component 1, Component 2, and (if applicable) Component 3 fields enter the real (in-phase) and imaginary (out-of-phase) parts of the body current density vector.
Abaqus/CAE calculates the magnitude and direction of the body current density vector and that information is passed into the user subroutine.
Click OK to save your data and to exit the editor.
Enter the Job module and display the job editor for the analysis job of interest. (For more information, see “Creating, editing, and manipulating jobs,” Section 19.7.)
In the job editor, click the General tab, and specify the file containing the user subroutine that defines the magnitude and direction of the load. For more information, see “Specifying general job settings,” Section 19.8.6.
Note: You can specify only one user subroutine file in the job editor; if your analysis involves more than one user subroutine, you must combine the user subroutines into one file and then specify that file.
