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Which of these correctors does the second-order Runge-Kutta method use?

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Which of these correctors does the second-order Runge-Kutta method use?

(a) Backward Euler corrector

(b) Forward Euler corrector

(c) Trapezoidal corrector

(d) Midpoint rule corrector

I got this question in class test.

My doubt stems from Transient Flows topic in chapter Transient Flows of Computational Fluid Dynamics

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Correct choice is (d) Midpoint rule corrector

The best explanation: The second step of the second-order Runge-Kutta method is the corrector step. For this correction, midpoint rule is used. This step makes this Runge-Kutta method a second-order method.

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