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When the field of the flow variable is exact, the residual will be __________

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in Computational Fluid Dynamics by (118k points)
When the field of the flow variable is exact, the residual will be __________

(a) negative

(b) positive

(c) zero

(d) one

This question was posed to me in quiz.

The origin of the question is Relaxation topic in section Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

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The correct answer is (c) zero

The best I can explain: When the solution field is exact, it means that the solutions converged. Therefore, the residual will be zero. The correction will also be zero in this case. But, in real, the solution will not reach the exact solution. Therefore, the residual will never be zero.

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