Question

The advantage of the upwind scheme is over the central-difference scheme is _____________

(a) accuracy

(b) stability

(c) high convergence rate

(d) consistency

I have been asked this question in an interview.

Question is taken from Convection-Diffusion Problems topic in section Convection-Diffusion Problems of Computational Fluid Dynamics

Answer 1

Right choice is (a) accuracy

Easy explanation: The upwind scheme is less accurate than the central difference schemes. But the central difference schemes are oscillatory. They do not give answers which are physically correct. This is the advantage of the upwind scheme over the central-difference scheme.