Question

Which of these is not the reason to resort to CFD for solving hypersonic problems?

(a) Inexpensive

(b) Fast

(c) Accurate

(d) Complex use

The question was asked during an online exam.

My question is based upon Hypersonics and Computational Fluid Dynamics in section Numerical Techniques for Nonlinear Supersonic Flow, Elements of Hypersonic Flow, Couette and Poiseuille Flow of Aerodynamics

Answer 1

Correct option is (d) Complex use

The explanation: Hypersonic flow makes use of computational fluid dynamics to get accurate results because it is very inexpensive, is fast and gives straighforward results. The practical engineering problems are approximated by making some assumptions to find pressure distribution, lift drag etc. The hypersonic flow usually varies from subsonic and supersonic flow because of the presence of a thick boundary layer between the surface and thin shock wave. This cannot be solved by the conventional boundary layer methods. Hence CFD plays an important role in finding the results.