Question

The pressure-correction equation of the compressible flows is ___________

(a) a hyperbolic equation

(b) an elliptic equation

(c) a combined elliptic and hyperbolic equation

(d) a parabolic equation

I had been asked this question during an interview.

This is a very interesting question from Compressible Flows topic in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Correct option is (a) a hyperbolic equation

For explanation I would say: The pressure-correction equation in the incompressible flows is an elliptic equation. This is transformed into a hyperbolic equation in the compressible flows which is capable of resolving shock waves.