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Which of these grids are called Chimera grids?

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Which of these grids are called Chimera grids?

(a) Structured grids with overlapping blocks

(b) Block-structured grids

(c) Block-structured grids with overlapping blocks

(d) Structured grids

The question was asked in a job interview.

My doubt is from Numerical Methods topic in section Numerical Methods of Computational Fluid Dynamics

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Correct answer is (c) Block-structured grids with overlapping blocks

To explain: Block-structured grids with overlapping blocks are called composite or chimera grids. The disadvantage of these grids is that conservation is not ensured in boundaries. This is helpful to follow moving bodies.

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