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Which of these techniques is used by the PISO algorithm?

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in Computational Fluid Dynamics by (118k points)
Which of these techniques is used by the PISO algorithm?

(a) Neighbour splitting

(b) Source splitting

(c) Coefficient splitting

(d) Operator splitting

The question was asked in an online interview.

My query is from Transient SIMPLE and PISO Algorithms topic in section Transient Flows of Computational Fluid Dynamics

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The correct choice is (d) Operator splitting

Easy explanation: The temporal accuracy of the PISO algorithm depends on the differencing scheme used. This includes the operator splitting technique used. Operator splitting uses different methods to calculate different variables.

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