Question

The numerical convection schemes should be _________

(a) upwind biased

(b) downwind biased

(c) upwind or downwind depending on the problem

(d) considering both upwind and downwind equally

I have been asked this question in final exam.

My question is taken from High Resolution Schemes topic in section High Resolution Schemes of Computational Fluid Dynamics

Answer 1

Right answer is (a) upwind biased

The best explanation: Physically, convection transports fluid from upstream to downstream. So, the numerical convection schemes should also be upwind biased. This is why, the NVF approach involved far upwind node also but not the far downwind node.