a) Three-dimensional flows cannot be analysed
b) Facilities do not exist in all fight regimes
c) The output generated is not as accurate as theoretical analysis
d) Long run-time
Answer: b
Explanation: Ground test facilities can be used to model three-dimensional flows also and even they produce accurate results in a less run-time. But they cannot be used to test all flight regimes as they want artificial set-up for every single property of the flow.
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