Question

The flux limiter is a function of __________

(a) the gradient at that central node

(b) the ratio of two consecutive gradients

(c) the product of two consecutive gradients

(d) the difference between two consecutive gradients

This question was posed to me in final exam.

My doubt is from High Resolution Schemes topic in division High Resolution Schemes of Computational Fluid Dynamics

Answer 1

The correct option is (b) the ratio of two consecutive gradients

Best explanation: Flux limiter prevents the excessive use of flux in regions where oscillations might occur and maximizes the contribution in smooth areas. The flux limiter is denoted by Ψ(r), where r is usually taken as the ratio of two consecutive gradients.