Question

Which of these equations is solved by the PISO algorithm in the extra corrector step?

(a) Pressure-correction equation

(b) Pressure equation

(c) Continuity equation

(d) Momentum equation

I had been asked this question during an internship interview.

Origin of the question is Incompressible Flows in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

The correct option is (d) Momentum equation

Easiest explanation: The initial pressure guesses are obtained from the momentum equation. This pressure field is used to get the velocity field approximations. This is corrected in the first corrector step using the pressure-correction equation. It is again corrected using the momentum equation in the second corrector step.