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Discussion

A boomed section is refined from four booms to eight, and the computed root stress changes by \( 0.4 \) per cent. This suggests that

  • A.The eight-boom model is wrong
  • B.Neither model can be trusted
  • C.Sixteen booms are certainly required
  • D.The four-boom idealisation was already adequate

Answer: D

A change of well under one per cent on refinement is evidence that the discretisation error is already small for that quantity. It is exactly the convergence argument used to justify a mesh density in a finite element model.

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