Question

How many predictor and corrector steps does the fourth-order Runge-Kutta method use?

(a) Three predictor and one corrector steps

(b) One predictor and three corrector steps

(c) Two predictor and two corrector steps

(d) One predictor and two corrector steps

I had been asked this question during an online interview.

I want to ask this question from Transient Flows topic in chapter Transient Flows of Computational Fluid Dynamics

Answer 1

Right answer is (c) Two predictor and two corrector steps

Easiest explanation: The fourth-order Runge-Kutta method totally has four steps. Among these four steps, the first two are the predictor steps and the last two are the corrector steps. All these steps use various lower order methods for approximations.