Question

Gradient for an unstructured grid is calculated by ___________

(a) looping over the nodes in the computational domain

(b) looping over the elements in the computational domain

(c) looping over the faces in the computational domain

(d) looping over the gradients in the computational domain

I have been asked this question by my college professor while I was bunking the class.

The query is from FVM in portion Finite Volume Methods of Computational Fluid Dynamics

Answer 1

The correct answer is (c) looping over the faces in the computational domain

Easiest explanation: Computation of gradient for the overall domain is more efficient than calculating locally element by element. For this purpose, all the faces are looped over and the gradients are updated.