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a) Example of non-obstructive (left) and obstructive (right) geometries. b) Geometries investigated in 2.1.2. Subpanels show the enlarged view of the three different kinds of narrowing: i) angled, ii) sharp and sudden, and iii) smoothed. The dimensions of the model in the figure are not reported in the actual scale in order to show the general pattern of the stress generating features.
