Question

The order of accuracy of the ADI scheme in the time direction is ___________

(a) third-order

(b) fourth-order

(c) first-order

(d) second-order

This question was posed to me in an online quiz.

Asked question is from CFD Techniques in section Some Simple CFD Techniques of Computational Fluid Dynamics

Answer 1

The correct answer is (d) second-order

To explain: The truncation error of the ADI scheme in the time direction is of order two. The ADI scheme is second-order accurate in the time direction. It uses two time-steps to move from the step t to t+Δt.