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The second-order Runge-Kutta method uses __________ as a predictor.

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The second-order Runge-Kutta method uses __________ as a predictor.

(a) backward order method

(b) forward Euler method

(c) midpoint rule

(d) multipoint method

I have been asked this question in class test.

Asked question is from Transient Flows in portion Transient Flows of Computational Fluid Dynamics

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Correct answer is (b) forward Euler method

Best explanation: The second-order Runge-Kutta method includes two steps. The first step can be called a half-step predictor. This is based on the forward Euler method which is an explicit method of first-order accuracy.

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