Question

Curvilinear coordinates do not suit __________

(a) Unstructured grids

(b) Structured grids

(c) Orthogonal grids

(d) Non-orthogonal grids

The question was posed to me during an interview for a job.

This interesting question is from Numerical Methods in division Numerical Methods of Computational Fluid Dynamics

Answer 1

The correct answer is (a) Unstructured grids

To explain I would say: For curvilinear coordinates, the grid should be very smooth and the change of grid direction from point to point must be very small. Since the grid direction in the unstructured grids varies much, they do not suit unstructured grids.