Question

If the normalized difference between the cell face values is high, the convergence rate ___________

(a) tends to infinity

(b) is undisturbed

(c) is low

(d) is high

This question was posed to me during an interview.

This is a very interesting question from Deferred Correction for High-Resolution Schemes topic in section High Resolution Schemes of Computational Fluid Dynamics

Answer 1

Correct option is (c) is low

To explain I would say: If the difference between the high-resolution scheme line and the upwind line increases, convergence is affected. The rate of convergence diminishes. This is when the normalized difference between the cell face values is high.