The TrigoWave dual force can be used as grid force (in the dynamics nodes) or as particle force (in a particle group).

It generates a force that is made up of several trigonometric functions (like sin, cos etc.) that can generate interesting rotational wind forces.
As trigonometric functions are periodically looping the force generates 'Waves' of forces.

It's perfect to create breaking waves in liquid scenarios but also for interesting vorticity effects in gaseous scenes