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The direction of the normal to a face in an unstructured mesh depends upon __________

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The direction of the normal to a face in an unstructured mesh depends upon __________

(a) Local indices

(b) Global indices

(c) Direction of flow

(d) Direction of increasing indices

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This intriguing question originated from FVM topic in chapter Finite Volume Methods of Computational Fluid Dynamics

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Right option is (b) Global indices

Explanation: The direction of the normal to a face depends on the indices in both structured and unstructured grids. For structured grids, it depends on the direction of increasing indices. For unstructured grids, the direction depends on the global index number.

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