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What is the order of accuracy of the hybrid differencing scheme?

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What is the order of accuracy of the hybrid differencing scheme?

(a) Fourth-order

(b) Third-order

(c) Second-order

(d) First-order

I have been asked this question in a national level competition.

This interesting question is from Convection-Diffusion Problems in chapter Convection-Diffusion Problems of Computational Fluid Dynamics

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The correct choice is (d) First-order

The explanation: The major disadvantage of the hybrid difference scheme is its low order of accuracy based on the Taylor series truncation term. It is first-order accurate. Yet, it is useful for solving practical flow problems.

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