Question

What is the difficulty in modelling supersonic blunt body problem?

(a) The PDE cannot be solved

(b) A PDE cannot be formed

(c) Mixed flow behaviour

(d) Boundary conditions cannot be formed

This question was posed to me in exam.

I'm obligated to ask this question of Mathematical Behaviour of PDE topic in section Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

Answer 1

Correct choice is (c) Mixed flow behaviour

The best I can explain: Supersonic flow over a blunt body creates a bow shock. This behaves as a normal shock near the leading edge and as an oblique shock downstream. So, the flow becomes a mixture of subsonic-supersonic flow based on spatial coordinates and makes the mathematical behaviour also mixed.