Question

Which of these procedures is done in the predictor step of the discretized momentum equation?

(a) Initial guess for velocity and the first corrected pressure are obtained

(b) First corrected values of pressure and velocity are obtained

(c) Initial guesses for pressure and velocity are obtained

(d) Initial guess for pressure and the first corrected velocity are obtained

This question was posed to me in quiz.

My question comes from Incompressible Flows topic in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Right option is (c) Initial guesses for pressure and velocity are obtained

For explanation I would say: In the first step of the PISO algorithm, an initial guess is made on the pressure and the velocity values. This is corrected later in the following corrector steps. This is exactly the same for the SIMPLE algorithm.