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What is the disadvantage of over-relaxation?

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in Computational Fluid Dynamics by (118k points)
What is the disadvantage of over-relaxation?

(a) Stability is decreased

(b) Divergence is increased

(c) Oscillations are increased

(d) Convergence is increased

This question was addressed to me at a job interview.

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

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Right answer is (a) Stability is decreased

The explanation: When the relaxation factor is more than one, the process is called over-relaxation. This will lead to a higher rate of convergence and leads to faster convergence. But, the disadvantage is that stability will be decreased.

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