Question

The gradient at the face of an element is obtained using ________

(a) Linear interpolation

(b) Geometric values

(c) Green-Gauss theorem

(d) Weighted average

This question was addressed to me in an international level competition.

This key question is from Diffusion Problem topic in chapter Diffusion Problem of Computational Fluid Dynamics

Answer 1

The correct answer is:

(c) Green-Gauss theorem

In computational fluid dynamics, the Green-Gauss theorem is commonly used to calculate the gradient at the face of an element by converting volume integrals to surface integrals, allowing for effective evaluation of gradients in discretized domains.