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When the relaxation factor is less than one, which of these will occur?

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in Computational Fluid Dynamics by (118k points)
When the relaxation factor is less than one, which of these will occur?

(a) Increase the speed of convergence

(b) Slow down the speed of convergence

(c) Decrease the stability

(d) Increase the divergence

I have been asked this question during an interview.

My doubt stems from Under-Relaxation topic in division Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

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Correct choice is (b) Slow down the speed of convergence

Explanation: The process is called under-relaxation when the relaxation factor is less than one. This decreases the rate of convergence of the results. But, the advantage is that the stability of the solution is increased.

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