OFFICIAL (a) (b) Figure 12: (a)Full and (b) zoomed vertical cross-sections views of the mesh at each boundary. Boundary layers are a needed component of models with a solid-fluid interface, as well as those with abrupt changes in material, temperature or heat generation, which is present at the wall of the cylindrical blasthole for all three scenarios. A horizontal cross-section from the centre of the coal seam illustrates the use of boundary layers in Figure 10 (a) and (b). (a) (b) Figure 13: (a) Full and (b) zoomed cross-section views of the 3D tetrahedral mesh, from the central "finer" blasthole, to yellow boundary layers and then growing outward.
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