Which of these statements about the Patankar’s under-relaxation is true?(a) The value form the previous iteration is modified(b) The diagonal coefficients are modified(c) The whole equation is modified(d) The neighbouring coefficient is modifiedI have been asked this question in an internship interview.The doubt is from Under-Relaxation in section Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

Which of these statements about the Patankar’s under-relaxation is t

1.	Which of these statements about the Patankar’s under-relaxation is true?(a) The value form the previous iteration is modified(b) The diagonal coefficients are modified(c) The whole equation is modified(d) The neighbouring coefficient is modifiedI have been asked this question in an internship interview.The doubt is from Under-Relaxation in section Discretization of the Source Term & Relaxation of Computational Fluid Dynamics
Answer» The correct option is (B) The diagonal coefficients are modified To explain: Patankar’s under-relaxation modifies the VALUE from the previous iteration, the diagonal coefficients and the NEIGHBOURING coefficients. The WHOLE equation REMAINS unmodified.

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