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Which of these characteristics of the PISO algorithm match with the SIMPLE algorithm?

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Which of these characteristics of the PISO algorithm match with the SIMPLE algorithm?

(a) No extra equation

(b) Extra equation

(c) Under-relaxation factor

(d) High convergence

I got this question in exam.

My question comes from Incompressible Flows topic in section Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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Correct answer is (c) Under-relaxation factor

The explanation is: The PISO algorithm uses the under-relaxation procedure followed in the SIMPLE algorithm. This is the only algorithm that is modified from the SIMPLE algorithm which uses this under-relaxation factor.

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