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Which of these features of structured grids is a disadvantage?

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Which of these features of structured grids is a disadvantage?

(a) Easy to solve

(b) Suitable for simple geometries

(c) Efficient in memory requirements

(d) Less time requirement

I have been asked this question during an interview for a job.

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

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The correct choice is (b) Suitable for simple geometries

To explain I would say: One of the major disadvantages of structured grids is that they are not suitable for complex geometries. Those can be modelled using unstructured grids only. The other disadvantage of structured grids is distribution.

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