Question

Which of these is correct about the central differencing scheme?

(a) The importance of upwind and downwind nodes depends on the problem

(b) It gives more importance to the downwind nodes

(c) It gives equal importance to upwind and downwind nodes

(d) It gives more importance to the upwind nodes

The question was asked in an interview for job.

My doubt is from Convection-Diffusion Problems in chapter Convection-Diffusion Problems of Computational Fluid Dynamics

Answer 1

Correct option is (c) It gives equal importance to upwind and downwind nodes

To explain I would say: The central differencing scheme gives equal importance to the upwind and the downwind nodes. The contribution of all the neighbouring nodes is considered for this approximation.