Question

Which of these terms of the momentum equations are altered by the transient term in the PISO algorithm?

(a) neighbouring coefficients

(b) central coefficients

(c) weighted average of the neighbouring coefficients

(d) velocity correction term

Answer 1

Correct choice is (b) central coefficients

Easy explanation: A term with the initial density, change in volume and change in time is added to the central coefficients of the momentum equations in all the directions. The neighbouring coefficients are not altered.