Discussion
A local submodel is driven by displacements from a global model. Its element size is \( 2 \) mm against the global model's \( 40 \) mm. The refinement ratio is
Answer: D
Correct answer: 20
The refinement ratio is the global element size over the submodel element size:
\[ \frac{40}{2} = 20 \]A ratio of this order is usual, and the submodel is driven by displacements interpolated from the global solution on its cut boundaries. The boundary must be placed far enough from the region of interest that the coarse model’s displacements there are trustworthy - Saint-Venant’s principle again.
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