Question

The intermediate step of the ADI scheme is at __________

(a) t+\(\frac{\Delta t}{3}\)

(b) t+\(\frac{\Delta t}{2}\)

(c) t-\(\frac{\Delta t}{2}\)

(d) t+\(\frac{\Delta t}{4}\)

I got this question in an internship interview.

The query is from CFD Techniques topic in section Some Simple CFD Techniques of Computational Fluid Dynamics

Answer 1

Right answer is (b) t+\(\frac{\Delta t}{2}\)

The explanation is: The first step of the ADI scheme is from t to t+\(\frac{\Delta t}{2}\). The second step of the ADI  scheme is from t+\(\frac{\Delta t}{2}\) to t+Δt. Here, the intermediate step t+\(\frac{\Delta t}{2}\) is extra for the process and the results here are not actually needed.