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What is the order of accuracy of the MacCormack’s technique?

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What is the order of accuracy of the MacCormack’s technique?

(a) Fourth-order

(b) Third-order

(c) First-order

(d) Second-order

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This intriguing question originated from Finite Difference Methods in division Finite Difference Methods of Computational Fluid Dynamics

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Right answer is (d) Second-order

Easiest explanation: MacCormack’s technique is second order accurate in both space and time. There is a special method used in MacCormack’s technique to make the order of accuracy two, even after reducing the lengthy algebra.

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