Discussion
Assertion (A): Reynolds and Mach numbers usually cannot both be matched on a subsonic model.
Reason (R): A smaller model needs a higher speed to reach the same Reynolds number.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Raising the speed to recover the Reynolds number also raises the Mach number past the value being simulated. Escaping the conflict means changing the density or the viscosity instead, which is what pressurised and cryogenic tunnels do.
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