Discussion
A student claims that because the finite element model converged, it must be correct. The claim is
Answer: C
Correct answer: Too strong; convergence is not validity
Convergence shows that the equations the model poses have been solved accurately, and nothing more. If the idealisation is wrong, the boundary conditions unrepresentative or the loads mistaken, refinement converges faithfully on the wrong answer. Verification - are the equations solved correctly? - and validation - are they the right equations? - are separate questions, and convergence addresses only the first.
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