A variable element can be used to define a function including several state variables. The equation can be expressed as a function expression or as a subroutine specified by users. Good initial condition helps to converge in the initial assembly process. The value of a variable element can be referenced by VARVAL (equation name). Expressions or User Written Subroutine can be utilized to define this element. Variable equation elements are defined by the Variable Equation command in the Subentity menu.
Figure 1 Variable icon in the Equation group of the Subentity tab