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Which of these methods is the basis of the leapfrog method?

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Which of these methods is the basis of the leapfrog method?

(a) Midpoint rule

(b) Trapezoidal rule

(c) Implicit Euler method

(d) Explicit Euler method

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This key question is from Transient Flows in section Transient Flows of Computational Fluid Dynamics

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Right option is (a) Midpoint rule

Easiest explanation: The midpoint rule uses the midpoint of the interval to approximate the results. This forms the basis of the leapfrog method which is a very important method for solving the partial differential equations.

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