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To overcome the performance issues of the PISO algorithm, which of these methods is used?

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To overcome the performance issues of the PISO algorithm, which of these methods is used?

(a) Time-steps based on temporal schemes are used

(b) Large time-steps are used

(c) First-order temporal differencing is used

(d) Higher-order temporal differencing is used

I got this question by my college director while I was bunking the class.

Asked question is from Transient SIMPLE and PISO Algorithms topic in section Transient Flows of Computational Fluid Dynamics

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Right option is (d) Higher-order temporal differencing is used

The explanation: The need for a small time-step in the PISO algorithm is overcome by using higher-order temporal differencing schemes. For example, a second-order implicit scheme with three time levels can be used.

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