The Global ODEs and DAEs (ge) interface (), found under the Mathematics branch () when adding a physics interface, is used to add global space-independent equations that can represent additional degrees of freedom (scalar variables) in a model. The equations can be ODEs, algebraic equations, and DAEs. The main default node is Global Equations, which you use to define the global equations, including the names of the variables, the required initial values, and an optional description.

The Global ODEs and DAEs interface does not have the Equation form setting present in physics interfaces; the same equations are instead assembled for any study step type. For use in Frequency Domain study steps, select a source for the Frequency to be used when interpreting time derivatives in the equations: From solver (the default) or User defined. When Frequency is User defined, also specify the desired frequency f (SI unit Hz).

The following nodes are available from the Global ODEs and DAEs ribbon toolbar (Windows users), Global ODEs and DAEs context menu (macOS or Linux users), or by right-clicking to access the context menu (all users).