Welcome to SimScale! you can easily give this formula as a load function in the force load boundary condition. The formula should look something like this: (some value).sin(2.pi.f) (please replace ’ . ’ with ’ * '). The phase can be changed by a phase change option below in the boundary condition.
You can have a look at this project for more info.: Harmonic analysis of an impeller (Please have a look at the ‘excentric vibration force’ in this example)
In case of any question/s, feel free to ask.