Question

I am using forward differences in the predictor step. Which method would you suggest me to use in the corrector step?

(a) Rearward differences

(b) Central differences

(c) Forward differences

(d) Second-order differences

This question was addressed to me in my homework.

My question is from Finite Difference Methods topic in chapter Finite Difference Methods of Computational Fluid Dynamics

Answer 1

Correct option is (a) Rearward differences

Easy explanation: If forward differences are used in the predictor step, rearward differences should be used in the corrector step and vice versa. At every time-step, this sequence should be changed while solving a time-marching problem.