Which of these equations is hyperbolic?
(a) Unsteady Navier-Stokes equation
(b) Steady Navier-Stokes equation
(c) Steady Euler equation
(d) Unsteady Euler equation
I had been asked this question in a job interview.
I'd like to ask this question from Mathematical Behaviour of PDE topic in section Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics