The Initial Values node adds initial values for the dependent variables that can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear solver. If you need to specify more than one set of initial values, you can add additional
Initial Values nodes.
Enter a value or expression for the Initial value for u,
u (dimensionless) and the
Initial time derivative of u,
(SI unit: 1/s). The defaults are 0 for both dependent variables.