Question

In real, how is convergence defined?

(a) Variations are accepted

(b) When the variation is less than the result

(c) When the variation falls below a certain acceptable range

(d) When the variation is the same as the result

The question was posed to me by my college director while I was bunking the class.

The question is from Discretization Aspects topic in division Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

The correct option is (c) When the variation falls below a certain acceptable range

The explanation is: In real, the variation between two consecutive iterations cannot be exactly the same. The value of variation will be constantly decreasing. So, the solution is said to be converged when the range of variation is acceptable.