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Mention hyphen/dash caveat for boundary symbols #1866

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Mar 8, 2024
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Mention hyphen/dash caveat for boundary symbols #1866

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Mention hyphen/dash caveat for boundary symbols
DanielDoehring Mar 8, 2024
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typo
DanielDoehring Mar 8, 2024
0f5c633
elaborate
DanielDoehring Mar 8, 2024
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2 changes: 2 additions & 0 deletions docs/src/meshes/p4est_mesh.md
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Expand Up @@ -256,6 +256,8 @@ By doing so, only nodesets with a label present in `boundary_symbols` are treate
Other nodesets that could be used for diagnostics are not treated as external boundaries.
Note that there is a leading colon `:` compared to the label in the `.inp` mesh file.
This is required to turn the label into a [`Symbol`](https://docs.julialang.org/en/v1/manual/metaprogramming/#Symbols).
**Important**: In Julia, a symbol _cannot_ contain a hyphen/dash `-`, i.e., `:BC-1` is _not_ a valid symbol.
Keep this in mind when importing boundaries, you might have to convert hyphens/dashes `-` to underscores `_`, i.e., `BC_1`.

A 2D example for this mesh, which is read-in for an unstructured mesh file created with `gmsh`, is presented in
`examples/p4est_2d_dgsem/elixir_euler_NACA6412airfoil_mach2.jl`.
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