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How many predictor and corrector steps does the PISO algorithm involve?

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How many predictor and corrector steps does the PISO algorithm involve?

(a) One predictor and one corrector steps

(b) Two predictor and one corrector steps

(c) Two predictor and two corrector steps

(d) One predictor and two corrector steps

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My doubt is from Incompressible Flows topic in division Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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Correct answer is (d) One predictor and two corrector steps

The explanation is: The SIMPLE algorithm has one predictor and one corrector steps. But, the PISO algorithm has an extra corrector step. Therefore, it can be called an extension of the SIMPLE algorithm.

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