Phase
You can add a Phase subnode to nodes that define a load in order to prescribe the phase angle in a frequency-domain analysis.
For modeling the frequency response, the physics interface splits the harmonic load into two parameters:
The amplitude, F, which is specified in the node for the load.
The phase (ϕ), which is specified in the Phase subnode.
Together these define a harmonic load, for which the amplitude and phase shift can vary with the excitation frequency, f:
Shell Properties

Phase
Enter the components of Load phase ϕ in radians (for a pressure the load phase ϕ is a scalar value). Add [deg] to a phase value to specify it using degrees.
Location in User Interface
Context Menus
Ribbon
Physics tab with Body Load, Boundary Load, Face Load, Edge Load, Point Load, Applied Force, or Applied Moment selected: