Question

Which of these statements is true for unstructured grids?

(a) It is simple to model and use

(b) Element connectivity is implicitly defined

(c) Element connectivity does not depend upon indices

(d) Bounding faces can be easily found

This question was addressed to me in final exam.

This intriguing question comes from FVM in division Finite Volume Methods of Computational Fluid Dynamics

Answer 1

The correct option is (c) Element connectivity does not depend upon indices

For explanation: All the entities should be named separately in an unstructured grid. There is no way to directly link the various entities of an unstructured grid. Thus, local connectivity has to be defined explicitly.