Good (and cheaper) alternative to Vortex Generator?

Triomphant Class with visible vortex generators on the underside of the aft horizontal planes. : r/submarines

Good (and cheaper) alternative to Vortex Generator? Toyota GR86 Forum - GT86 Forum, Subaru BRZ Forum, Scion

Solar Vortex Generator

Revolutionizing Renewable Energy: The Bladeless Vortex Generator Explained

Whirly bits—and why they matter

Vortex Wind:The World's Most Powerful and Affordable Bladeless Wind Turbine That Can Power Your Home

Review of research on low-profile vortex generators to control boundary-layer separation - ScienceDirect

Overview of the vortex generator in staggered tube arrangement found by

Good (and cheaper) alternative to Vortex Generator? Toyota GR86 Forum - GT86 Forum, Subaru BRZ Forum, Scion

Helicopter drag reduction by vortex generators - ScienceDirect

Increasing Wind Turbine AEP with Vortex Generators

Test section with various vortex generators.