Fins on Engine Cowling

[getsetgo]

Kijangnim

Warm greeting

Turbulence I was referring to mmrassi”s post not yours. I did not read or reply to your post.

Vortex generators are always fitted on the upper side of lift generating surfaces ,at an angle to the airflow to generate vortex and delay separation of air on the upper side of the wing ,this increases the lift generated by the wing.
Vortex generator increases the lift/performance, doesn’t reduce drag.
In this picture the small fin on the engine cowl is bifurcating the the airflow and optimizing its distribution around the pillion and the wing, by directing more towards lift producing surface and less towards pillion.
Thereby generating better performance .
Fin position, angle ,size & shape is the result of extensive wind tunnel tests. (NO GRAB)
There is no need to create vortex ahead of aerofoil.
that’s why this fin is not called vortex generator.
Other aspects
Could be this small metal piece is the waist left over after the a/c was complete and manufacturer thought of some cosmetic work around the engines.
And When it breaks manufacturer can sell new one for exorbitant amount as spares.
or to make pilot work harder while doing the walk around