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There is no relaxation when the relaxation factor is __________

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There is no relaxation when the relaxation factor is __________

(a) positive infinity

(b) negative infinity

(c) one

(d) zero

I had been asked this question by my school teacher while I was bunking the class.

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

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Best answer
The correct option is (d) zero

The best explanation: If the relaxation factor is zero, it means that the effect of the external factors is completely removed. There is no relaxation if the relaxation factor is one. The same effect as the original one is taken for consideration.

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