The Control Field node () is an attribute node that handles settings for field variables that are acting as control variables. Control variables have a special status when using the Sensitivity or Optimization solver. Each control field has a separate Control Field node. This attribute is used together with the Dependent Variables node.

The Field components section displays the variable names for the field components.

Use the Solve for this field check box to control whether to use this variable when solving a sensitivity or optimization problem. For other parts of the solution process, the control fields are held fixed. This setting is only available if the Dependent Variables node’s setting Defined by study step is set to User defined. If the variable is not solved for, its values are determined by the settings in the Values of Variables Not Solved For section of the corresponding Dependent Variables node.

Use the Store in output check box to control whether to store the variable in any output solution or not. Clearing this check box saves memory by not storing the field if it is not needed for the postprocessing.