Question

A solution is ideally converged if _________

(a) the results match with the exact solution

(b) the results for two consecutive iterations are the same

(c) the results for two schemes are the same

(d) the results for different boundary conditions are the same

I had been asked this question in an interview.

This intriguing question comes from Discretization Aspects topic in portion Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

The correct choice is (b) the results for two consecutive iterations are the same

To elaborate: Ideally, a solution of a system of equations is said to be converged if the results of two consecutive iterations are exactly the same without any variation. No more iterations are required after this.