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Tolerance for iteration errors is usually based on _______________

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Tolerance for iteration errors is usually based on _______________

(a) convergence

(b) residuals

(c) stability

(d) round-off error

I have been asked this question during an online exam.

Enquiry is from Discretization Aspects in chapter Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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Best answer
Right answer is (b) residuals

The explanation is: A tolerance should be set for the convergence of iterations to say when to stop the iterations. To set this, tolerance residuals are analysed. Residual directly quantifies the error in the solution of a system.

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