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Which of these statements is correct about the pressure correction equation?

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Which of these statements is correct about the pressure correction equation?

(a) An over-relaxation factor is used to avoid divergence

(b) An under-relaxation factor is used to avoid divergence

(c) An under-relaxation factor is used to avoid undershoots

(d) An over-relaxation factor is used to avoid undershoots

The question was asked by my school principal while I was bunking the class.

The query is from Incompressible Flows in chapter Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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The correct answer is (b) An under-relaxation factor is used to avoid divergence

Easiest explanation: The pressure correction equation may diverge if an under-relaxation factor is not used. So, an under-relaxation factor is used with the correction term which is added to the guessed term to get the correct value.

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