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Vortex Generators are selectively placed by Master Fin Designer Bob Evans on some Force Fin models to create counter rotating vortices.
Underwater thrust is the meeting and continuance of counter rotating vortices.
Vortex Generators do not create turbulence. To the contrary, turbulence is the water breaking away from the fin's direction of travel.
The micro vortices created by Vortex Generators reattach the water to the fin blade to increase the speed of water and limit turbulent flow. They reduce your kicking effort and eliminate potential fin shutter you may experience with long fins made by others.
Along the body of a humpback whale are selectively placed bumps. These bumps act as "vortex generators" to break the surface tension of the water.