Question

Which among the following is a reason why we do not completely rely upon ground tests for analysing fluid dynamics?

(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

The question was asked during an interview for a job.

My doubt is from Philosophy topic in portion Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

Answer 1

The correct option is (b) Facilities do not exist in all fight regimes

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.