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Which of these statements is false? (a)Unstructured grids are always non-orthogonal

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in Computational Fluid Dynamics by (118k points)
Which of these statements is false?

(a) Unstructured grids are always non-orthogonal

(b) Structured grids are always orthogonal

(c) Non-orthogonal grids can be structured or unstructured

(d) Curvilinear structured grids are non-orthogonal

I got this question during an internship interview.

My query is from Diffusion Problem in portion Diffusion Problem of Computational Fluid Dynamics

1 Answer

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Correct choice is (b) Structured grids are always orthogonal

Easiest explanation: Non-orthogonality can exist in structured grids also when it is curvilinear. Structured curvilinear grids and unstructured grids are non-orthogonal. So, the statement “Structured grids are always orthogonal” is wrong.

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