Discussion
Match each flow-control device in List I with how it works in List II.
List I
A. Vortex generator
B. Boundary-layer suction
C. Golf ball dimple
D. Streamlining
List II
1. Removes the slowest fluid through the surface
2. Stirs faster air down towards the wall
3. Tapers the rear so the pressure rise is gentle
4. Trips the layer turbulent to bring on the drag crisis
Select the correct match.
Answer: C
All four attack separation, but by different routes: two add momentum near the wall, one removes the fluid that has lost it, and streamlining reduces the demand instead by easing the pressure gradient the layer must survive.
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