Discussion
Match each correction in List I with its cause in List II.
List I
A. Solid blockage
B. Wake blockage
C. Horizontal buoyancy
D. Support interference
List II
1. The velocity deficit behind the model
2. The volume the model occupies
3. The sting or strut disturbing the flow
4. A streamwise pressure gradient from wall boundary layers
Select the correct match.
Answer: B
These four are the standard corrections applied to almost every low-speed tunnel result. Confusing horizontal buoyancy with the model's weight is the classic error; it is entirely a pressure-gradient effect produced by the tunnel itself.
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