Question

The order of temporal accuracy achieved by the PISO algorithm for pressure and momentum are ___________ and ___________ respectively.

(a) four, three

(b) two, three

(c) three, four

(d) four, two

This question was addressed to me by my college director while I was bunking the class.

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

Answer 1

Correct choice is (c) three, four

Explanation: The PISO procedure is repeated at each time-step to calculate the velocity and pressure values. This algorithm results in third-order temporally accurate pressure values and fourth-order temporally accurate momentum values.