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What is the maximum possible accuracy for the two-level methods?

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in Computational Fluid Dynamics by (118k points)
What is the maximum possible accuracy for the two-level methods?

(a) Fifth-order

(b) Fourth-order

(c) Third-order

(d) Second-order

The question was asked in an internship interview.

The origin of the question is Transient Flows topic in section Transient Flows of Computational Fluid Dynamics

1 Answer

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Right option is (d) Second-order

The explanation is: The two-level schemes can at most give an accuracy of order two. The trapezoidal and midpoint rules and also the backward Euler method are second-order accurate. But, this does not determine the accuracy of the method solely.

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