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What is the cause of cross-stream numerical diffusion?

(a) One-dimensional nature of the assumed profiles

(b) Multi-dimensional nature of the assumed profiles

(c) Higher order of accuracy

(d) Higher order of interpolation

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Right option is (a) One-dimensional nature of the assumed profiles

The explanation is: One of the types of numerical diffusion errors is the cross-stream numerical diffusion. Cross-stream numerical diffusion is caused by the one-dimensional nature of interpolation when the grid is multi-dimensional. This is caused by cross-flow diffusion or false diffusion.

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