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The order of accuracy of the ADI scheme in the x and y-directions are __________ and __________

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The order of accuracy of the ADI scheme in the x and y-directions are __________ and __________

(a) second-order and first-order

(b) first-order and second-order

(c) second-order and second-order

(d) second-order and third-order

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The above asked question is from CFD Techniques in division Some Simple CFD Techniques of Computational Fluid Dynamics

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Correct answer is (c) second-order and second-order

The explanation is: The truncation errors of the ADI scheme in the x and the y-directions are O(Δx^2) and O(Δy^2). Therefore, the order of accuracy of the ADI scheme in the x and the y-directions are two and two respectively.

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